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: DocuSign Envelope ID: 798F7E2C-0AE6-40EE-BFB4-3AB848988972
A. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources.
B. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS or unsteady HEC- RAS. 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.
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.
D. 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.
E. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization.
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.
G. 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.
H. Use hydrograph calculations and peak flows to determine the storage required.
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.
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:
Complex Hydraulic Design and Documentation. If the revisions of the provided report are required, the Engineer shall provide the following data collection services for the frontage road bridges over lake Xxx Xxxxxxx as directed:
1. 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.
2. 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: DADDA27D-207C-44D8-A3A7-49A72052A5A9 Contract No. 18-7SDP5010
3. 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.
4. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization.
Complex Hydraulic Design and Documentation. The Consultant shall provide the following services:
a. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources.
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.
c. Analyze two bridges crossing Upper Buffalo Bayou and Little Prong Creek. Both channels are FEMA studied with a defined floodplain and floodway.
Complex Hydraulic Design and Documentation. The Consultant shall provide the following services: Gather pertinent information regarding existing drainage facilities and features from existing plans andother available studies or sources. Perform a hydrologic impact analysis using the Rational Method to determine if the increased impervious cover associated with the proposed sidewalks will result in an increase in peak flow ratesfor the 2-yr, 25-yr, 10-yr, and 100-yr storm events. Perform a hydraulic impact analysis for two (2) proposed pedestrian bridges using flow rates from hydrologic impact analysis and appropriate hydraulic methods, which may include computer modelssuch as Bentley FlowMaster. Develop a TCSS Manual Waiver Request Letter summarizing the methodology and assumptions used indeveloping the hydrologic and hydraulic analyses. 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. Consultants shallnot use versions beyond those noted above without first discussing with City/TxDOT. Consider pre- construction, present and post-construction conditions, as well as
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 County. 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. Consider pre-construction, present and post-construction conditions, as well as future widening, as determined in the Work Authorization.
4. 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.
5. 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.
6. Use hydrograph calculations and peak flows to determine the storage required.
7. 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.
8. 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. Review the Interstate Highway 35 Segment 6 Schematic Drainage Report for Lady Bird Lake to Oltorf Street and all accompanying information provided by the State.
2. Analyze the methods, assumptions, calculations and results of the schematic report to determine if the study was of sound engineering judgement.
3. The Interstate Highway 35 Segment 6 Schematic Drainage Report for Lady Bird Lake to Oltorf Street provided 5 mitigation alternatives for addressing increases in peak runoff from the project. The engineer shall further assess these alternatives and make recommendations to State on the preferred alternative considering cost, feasibility and the effects on the entire area. Once an alternative has been agreed upon, this will be the alternative which will be progressed to the PS&E design.
4. Provide volumetric 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:
A. Gather information regarding existing drainage facilities and features from existing plans and other available studies or sources.
B. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HEC-RAS, unsteady HEC-RAS or 2D
Complex Hydraulic Design and Documentation. The Engineer shall review the hydraulic analyses provided in the hydraulic report(s) for the IH 30 Schematic (CSJs: 0000-00-000, 0000-00-000, 0009-12- 219, 000911-241, 0009-12-240) provided by the State for concurrence. The Engineer shall not use the hydraulic results provided in the IH 30 Schematic (CSJs 0000-00-000, 0000-00-000, 0000-00-000, 000911-241, 0009-12-240) for the cross drainage structures without assessing of their validity in the PS&E design. If the revisions of the provided report are required, the Engineer shall provide the following data collection services as directed by the State:
1. Hydraulic Analysis for Cross Drainage Structures. Perform hydraulic design and analysis using appropriate hydraulic methods, which may include computer models such as HY-8, Bentley FlowMaster, HEC-RAS V4.1, unsteady HEC-RAS or 2D models such as XP-SWMM. 2D hydraulic models shall not be developed without the express permission of the State’s District Hydraulic Engineer. If 2D modeling is requested from the State and information is not available at the time of initial scoping, this work shall be considered as additional work. 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. Cross drainage design shall be performed using the following hydraulic programs: HY-8 Program: HY-8 shall be utilized for simple minor cross drainage structures (span opening < 20-ft) located in the FEMA Zone “X” and doesn’t encounter overtopping for the design storm frequency and split flow along frontage roads and mainlanes. HY-8 shall also be only utilized for minor cross drainage structures that continuously extend across the frontage roads and mainlanes. HEC RAS V4.1: HEC-RAS shall be utilized to analyze Bois D’Arc Bridge, Sabine Creek Tributary 2 Bridge (Relief Bridge), and bridge- class culverts (span opening > 20-ft) located in the regulatory FEMA DocuSign Envelope ID: 81F7252A-C4FA-4500-8C54-29C866EB3486 Xxxxx “A” or “AE”. HEC-RAS shall also be utilized for cross drainage systems that have gap opening in the ditch areas between the mainlanes and frontage roads. HEC-RAS shall be utilized for culvert system that include split flow regime or encounter overtopping for the design storm frequency. Geopak Drainage Program: Geopak Drainage shall be utilized in analyzing cros...
