Common use of Complex Hydraulic Design and Documentation Clause in Contracts

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the StateOwner. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-HEC- RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other StateOwner’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorizationtask order. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorizationtask order, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the StateTown. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work AuthorizationOrder. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work AuthorizationOrder, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. a. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. b. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. c. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. d. If the appropriate hydrologic model requires storage discharge DocuSign Envelope ID: F707DECA-9FA0-4A6C-8013-4547938899C1 relationships, develop HEC-RAS models or other State’s approved models that will compute account for these storage discharge relationships along the channel. 5. e. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. f. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes g. Compute water surface profiles for existing and proposed roadway elevationsconditions. The Engineer shall provide mitigation to offset a decrease any increases in the 1% AEP flood plain volumeswater surface profile. For a FEMA Flood Zone AE (as defined in the TxDOT Hydraulic Design Manual), the ENGINEER shall obtain a zero rise in the water surface profile, beyond the right of way line, unless otherwise approved by the State. 8. h. Use hydrograph calculations and peak flows flo ws to determine the storage required. 9. i. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. j. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as Hydrologic Engineering Center – River Analysis System (HEC-RAS), unsteady HEC-RAS or 2D models such as Storm Water Management Model (SWMM). 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies.. DocuSign Envelope ID: B36C3E7B-D32F-4D07-94E4-B8954C8506B4 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor one percent (1% %) AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in one percent (1% %) AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-on- the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-HEC- RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.. DocuSign Envelope ID: 8B0EE02C-E455-423C-9476-3FA4EBD98809

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities facilities, features, and features appurtenances from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methodsmethods for the project area, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Development of 2D models will be provided as needed, at the written request of the State’s Project Manager, to be considered as supplemental agreement Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic hydraulic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic hydraulic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present construction and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. . DocuSign Envelope ID: 00030A7D-3D10-434B-B077-86515E98EAAF 7. If required in the individual Work Authorization, compute Compute right of way corridor 1% AEP flood plain peak volumes for existing and proposed roadway elevationsimprovements. The Engineer shall provide detention mitigation to offset a decrease an increase in post project 1% AEP flood plain peak volumes. 8. Use hydrograph routing calculations and peak flows volume to determine the detention storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis.. DocuSign Envelope ID: FA09ABAD-94E6-4678-A208-A80E623CD52C 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required.. DocuSign Envelope ID: CB7B82B2-FA3B-4DDD-957A-C5AE0E5F436A 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, LiDAR, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge and culvert crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required.. DocuSign Envelope ID: 639E691C-A3CC-4853-AD7B-C269303B6046 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required.. DocuSign Envelope ID: 981599F8-5D6E-41E6-ADFA-1DA0DC55F35E 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis.. DocuSign Envelope ID: E0E3AD65-416A-4906-A2FD-ED83ABE18456 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as Hydrologic Engineering Center – River Analysis System (HEC-RAS), unsteady HEC-RAS or 2D models such as Storm Water Management Model (SWMM). 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies.. DocuSign Envelope ID: E767BC6F-115E-4461-9416-A68BBF4757F6 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor one percent (1% %) AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in one percent (1% %) AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required.. DocuSign Envelope ID: 8F4C5F80-CEA4-4B7A-AA13-EF50310E0F8C 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings.. DocuSign Envelope ID: F9AD1D3C-C2EE-4E82-9C7E-21604456077D 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies.. DocuSign Envelope ID: 5174409E-E49B-4D11-8837-551F1909917A 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources.. DocuSign Envelope ID: 923E8011-1E2D-416E-8D69-5FFD494D36B6 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as Hydrologic Engineering Center – River Analysis System (HEC-RAS), unsteady HEC-RAS or 2D models such as Storm Water Management Model (SWMM). 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor one percent (1% %) AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in one percent (1% %) AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. a. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. b. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. c. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. d. If the appropriate hydrologic model requires storage discharge DocuSign Envelope ID: F3F854F6-FE6A-49D4-9872-9DC2363FC73E relationships, develop HEC-RAS models or other State’s approved models that will compute account for these storage discharge relationships along the channel. 5. e. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. f. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes g. Compute water surface profiles for existing and proposed roadway elevationsconditions. The Engineer shall provide mitigation to offset a decrease any increases in the 1% AEP flood plain volumeswater surface profile. For a FEMA Flood Zone AE (as defined in the TxDOT Hydraulic Design Manual), the ENGINEER shall obtain a zero rise in the water surface profile, beyond the right of way line, unless otherwise approved by the State. 8. h. Use hydrograph calculations and peak flows flo ws to determine the storage required. 9. i. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. j. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as Hydrologic Engineering Center – River Analysis System (HEC-RAS), unsteady HEC-RAS or 2D models such as Storm Water Management Model (SWMM). 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies.. DocuSign Envelope ID: E6A69BC8-1AF8-478D-A598-06F4CAE4CFA7 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor one percent (1% %) AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in one percent (1% %) AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources, including the schematic drainage report. 2. Perform and validate hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC- RAS, unsteady Hydrologic Engineering Center – River Analysis System (HEC-RAS, unsteady HEC) or two-RAS or 2D dimensional (2D) models such as SWMM. 2D models shall not be SWMM that were developed without in the express permission schematic portion of the Statethis project. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If Best available models for the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis.San Marcos River and Willow Springs Creek are available from the City of San Marcos 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. . DocuSign Envelope ID: 272D98F7-7E9E-42C2-A06F-E7D2542DAFD3 Contract No. 14-7SDP5001 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify Validate and quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations WSELs for the above listed hydraulic conditions and hydrologic eventsevents using the previously developed schematic drainage study. Impacts will The Engineer shall make recommendations for the proposed design which would limit any increase in WSELs upstream and downstream of the facility to be determined contained within State right of way. If there are conditions which cause an increase in WSEL outside of State right of way, The Engineer shall evaluate the potential risk to adjacent properties both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute Compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide evaluate the need for mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessaryThe IH-35 at SH 123 Preliminary Drainage Report will be provided, present which proposes mitigation measures along with alternative for addressing project drainage and water quality impacts. The engineer shall further assess these alternatives and make recommendations to State on the advantages preferred alternative considering cost, feasibility and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs Once an alternative has been agreed upon, this will be the alternative which will be progressed in the reportPS&E design. 10. Provide hand volumetric calculations which quantify the cut and fill within the 1% AEP flood plain, if any. Consider and validate the fill in the floodplain and storage analysis of the ditch on the NBFR median north of the San Marcos River. Evaluate the need to maintain discharge leaving this ditch at rates equal to or less than existing discharges due the Flood Zone AH located east of the NBFR. Evaluate fill in the mitigation at the San Marcos River and at the Willow Springs crossing.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required.. DocuSign Envelope ID: 211A8780-3A56-4C71-A0A9-95EA90C5E646 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-on- the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-HEC- RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 76. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide Offsite mitigation may be required to offset a decrease in 1% AEP flood plain volumes. 87. Use hydrograph calculations and peak flows to determine the storage required. 98. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the reportcosts. 109. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies.. DocuSign Envelope ID: 487DF4F5-443A-402D-88BD-EC5BD0BE2A0F 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-on- the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis.. DocuSign Envelope ID: ED57FAE2-481A-4535-A126-CE7F0E526760 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-HEC- RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 76. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide Offsite mitigation may be required to offset a decrease in 1% AEP flood plain volumes. 87. Use hydrograph calculations and peak flows to determine the storage required. 98. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 109. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources.. DocuSign Envelope ID: 679175E2-1976-4615-BA79-40AD36929E37 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as Hydrologic Engineering Center –River Analysis System (HEC-RAS), unsteady HEC-RAS or 2D models such as Storm Water Management Model (SWMM). 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor one percent (1% %) AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in one percent (1% %) AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. a. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. b. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. c. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. d. If the appropriate hydrologic model requires storage discharge DocuSign Envelope ID: CCFE3302-82A5-48DE-9B9A-8BCFBEBFCC46 relationships, develop HEC-RAS models or other State’s approved models that will compute account for these storage discharge relationships along the channel. 5. e. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. f. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes g. Compute water surface profiles for existing and proposed roadway elevationsconditions. The Engineer shall provide mitigation to offset a decrease any increases in the 1% AEP flood plain volumeswater surface profile. For a FEMA Flood Zone AE (as defined in the TxDOT Hydraulic Design Manual), the ENGINEER shall obtain a zero rise in the water surface profile, beyond the right of way line, unless otherwise approved by the State. 8. h. Use hydrograph calculations and peak flows flo ws to determine the storage required. 9. i. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. j. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as Hydrologic Engineering Center – River Analysis System (HEC-RAS), unsteady HEC-RAS or 2D models such as Storm Water Management Model (SWMM). 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies.. DocuSign Envelope ID: 7E35C160-7769-4E34-87BF-0A3AF65FF97E 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor one percent (1% %) AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in one percent (1% %) AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as Hydrologic Engineering Center – River Analysis System (HEC-RAS), unsteady HEC-RAS or 2D models such as Storm Water Management Model (SWMM). 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies.. DocuSign Envelope ID: 4EB23D04-0FA8-470B-A4D7-463E9090543B 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor one percent (1% %) AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in one percent (1% %) AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies.. DocuSign Envelope ID: FD24F92F-6139-4C7F-AA82-1622E42AE476 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis.. DocuSign Envelope ID: 6EFD4AA6-1290-4298-9122-547DBF71FEF7 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings.. DocuSign Envelope ID: F04D8EFA-7DC2-4EDC-AAF6-887BB1F875D0 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis.. DocuSign Envelope ID: E73D9091-6C82-469F-B42B-3F0B45BB646B 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other DocuSign Envelope ID: DE976FF4-2D56-4B5B-B430-D8ABBAC3EC05 appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as Hydrologic Engineering Center – River Analysis System (HEC-RAS), unsteady HEC-RAS or 2D models such as Storm Water Management Model (SWMM). 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies.. DocuSign Envelope ID: F274686F-85C9-4CBD-A478-F69018DCE295 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor one percent (1% %) AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in one percent (1% %) AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies. 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute account for these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes Compute water surface profiles for existing and proposed roadway elevationsconditions. The Engineer shall provide mitigation to offset a decrease any increases in the 1% AEP flood plain volumeswater surface profile. For a FEMA Flood Zone AE (as defined in the TxDOT Hydraulic Design Manual), the ENGINEER shall obtain a DocuSign Envelope ID: 82ABE615-A8AB-4523-B50C-6FA5DBECD719 zero rise in the water surface profile, beyond the right of way line, unless otherwise approved by the State. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D models such as SWMM. 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies.. DocuSign Envelope ID: EE409C2E-41D7-48B7-8169-C48996185D1B 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor 1% AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in 1% AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.

Complex Hydraulic Design and Documentation. The Engineer shall provide the following services: 1. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources. 2. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as Hydrologic Engineering Center – River Analysis System (HEC-RAS), unsteady HEC-RAS or 2D models such as Storm Water Management Model (SWMM). 2D models shall not be developed without the express permission of the State. Data entry for appropriate hydraulic computer programs shall consist of a combination of both on-the-ground survey and other appropriate sources including but not limited to topographic maps, GIS modeling, and construction plans and existing hydrologic studies.. DocuSign Envelope ID: A17636F5-01D8-4DFA-AD46-30101F4B392A 3. Use the current effective FEMA models, where appropriate, as a base model for the analysis. If a “best available data” model is provided by the local floodplain administrator, it must be utilized accordingly for this analysis. Review the provided base model for correctness and updated as needed. If the provided effective model is not in a HEC-RAS format, convert it to HEC-RAS for this analysis. 4. If the appropriate hydrologic model requires storage discharge relationships, develop HEC-RAS models or other State’s approved models that will compute these storage discharge relationships along the channel. 5. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization. 6. Quantify impacts, beneficial or adverse, in terms of increases in peak flow rates and water surface elevations for the above listed hydraulic conditions and hydrologic events. Impacts will be determined both upstream and downstream of the bridge crossings. 7. If required in the individual Work Authorization, compute right of way corridor one percent (1% %) AEP flood plain volumes for existing and proposed roadway elevations. The Engineer shall provide mitigation to offset a decrease in one percent (1% %) AEP flood plain volumes. 8. Use hydrograph calculations and peak flows to determine the storage required. 9. If necessary, present mitigation measures along with the advantages and disadvantages of each. Each method must consider the effects on the entire area. Include approximate construction costs in the report. 10. Provide hand calculations which quantify the cut and fill within the 1% AEP flood plain, if any.