Common use of Roadway Design Clause in Contracts

Roadway Design. The Engineer shall prepare roadway plans, profiles and typical sections for the proposed improvements as requested by the State. Prior to the 30% submittal the Engineer shall schedule a workshop to review profiles and cross-sections with the State. The profile and cross sections shall depict the 2, 5, 10, 25, 50, 100 and 500 year (if available) water surface elevations. The drawings must provide an overall view of the roadway and existing ground elevations with DocuSign Envelope ID: F3F854F6-FE6A-49D4-9872-9DC2363FC73E respect to the various storm design frequencies for the length of the project. This must enable the State to determine the most feasible proposed roadway profile. The State approval of the proposed profiles and cross sections must be procured before the Engineer continues with the subsequent submittals. The roadway plans must be complete and organized in accordance with the latest edition of the State’s PS&E Preparation Manual. A. DRAINAGE DESIGN 1. DATA COLLECTION a. Conduct field inspections to observe current conditions and the outfall channels, the cross drainage structures, drainage easements, the tributary channel, and land development projects that contribute flow to the tributary. Document field inspections with digital photos. b. Collect available applicable data including GIS data and maps, site survey data, construction plans, previous reports and studies, and readily available rainfall history for the area. Particular sources of data collected must include, but are not limited to, the State, County, and Federal Emergency Management Agency (FEMA). c. Collect available Flood Insurance Rate Maps (FIRMs), Flood Insurance Study (FIS) study data, and any effective HECRAS or HEC-2 models. d. Review survey data and coordinate any additional surveying needs with State. e. At the State’s request, existing drainage structures shall be represented in a 3D MicroStation model. f. Meet with local government officials to obtain historical flood records. Interview local residents or local government employees to obtain additional high-water information if available. Obtain frequency of road closure and any additional high-water information from the District Maintenance office. g. Submit a letter report to the State Project Manager detailing completion of data collection. DocuSign Envelope ID: F3F854F6-FE6A-49D4-9872-9DC2363FC73E 2. HYDROLOGIC STUDIES The Engineer shall provide the following services: a. Incorporate in the hydrologic study a thorough evaluation of the methodology available, comparison of the results of two or more methods, and calibration of results against measured data, if available. b. Calculate discharges using appropriate hydrologic methods, as included in this document or as approved by the STATE. c. Consider the pre-construction and post-construction conditions in the hydrologic study, as required in the individual Work Authorization. The additional lanes may be accounted for by increasing percent development or by a higher curve number, as deemed appropriate for the site. d. Obtain the drainage area boundaries and hydrologic parameters such as impervious covered areas, and overland flow paths and slopes from appropriate sources including, but are not limited to, topographic maps, GIS modeling, construction plans, and existing hydrologic studies. The Engineer shall not use existing hydrologic studies without assessing of their validity. If necessary, obtain additional information such as local rainfall from official sites such as airports. e. The plan set must include, at a minimum, the “design” frequency to be specified in the Work Authorization and the 1% AEP storm frequency. The report must include the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP). Perform scour evaluations for both the 100yr and 500yr frequencies. f. Compare calculated discharges to the effective FEMA flows. If calculated discharges are to be used in the model instead of the effective FEMA flows, full justification must be documented.

Roadway Design. The Engineer shall prepare roadway plans, profiles and typical sections for the proposed improvements as requested by the State. Prior to the 30% submittal the Engineer shall schedule a workshop to review profiles and cross-sections with the State. The profile and cross sections shall depict the 2, 5, 10, 25, 50, 100 and 500 year (if available) water surface elevations. The drawings must DocuSign Envelope ID: DB60124E-7585-4844-AF91-B8FDD08F857C provide an overall view of the roadway and existing ground elevations with DocuSign Envelope ID: F3F854F6-FE6A-49D4-9872-9DC2363FC73E respect to the various storm design frequencies for the length of the project. This must enable the State to determine the most feasible proposed roadway profile. The State approval of the proposed profiles and cross sections must be procured before the Engineer continues with the subsequent submittals. The roadway plans must be complete and organized in accordance with the latest edition of the State’s PS&E Preparation Manual. A. DRAINAGE DESIGN 1. DATA COLLECTIONCOLLECTION The Engineer shall provide the following data collection services: a. Conduct field inspections to observe current conditions and the outfall channels, the cross drainage structures, drainage easements, the tributary channel, and land development projects that contribute flow to the tributary. Document field inspections with digital photos. b. Collect available applicable data including GIS data and maps, site survey data, construction plans, previous reports and studies, and readily available rainfall history for the area. Particular sources of data collected must include, but are not limited to, the State, County, and Federal Emergency Management Agency (FEMA). c. Collect available Flood Insurance Rate Maps (FIRMs), Flood Insurance Study (FIS) study data, and any effective HECRAS or HEC-2 models. d. Review survey data and coordinate any additional surveying needs with State. e. At the State’s request, existing drainage structures shall be represented in a 3D MicroStation model. f. Meet with local government officials to obtain historical flood records. Interview local residents or local government employees to obtain additional high-water information if available. Obtain frequency of road closure and any additional high-water information from the District Maintenance office. g. f. Submit a letter report to the State Project Manager detailing completion of data collection. DocuSign Envelope ID: F3F854F6-FE6A-49D4-9872-9DC2363FC73E 2. HYDROLOGIC STUDIES The Engineer shall provide the following services: a. Incorporate in the hydrologic study a thorough evaluation of the methodology available, comparison of the results of two or more methods, and calibration of results against measured data, if available. b. Calculate discharges using appropriate hydrologic methods, as included in this document or as approved by the STATE. c. Consider the pre-construction and post-construction conditions in the hydrologic study, as required in the individual Work Authorization. The additional lanes may be accounted for by increasing percent development or by a higher curve number, as deemed appropriate for the site. d. Obtain the drainage area boundaries and hydrologic parameters such as impervious covered areas, and overland flow paths and slopes from appropriate sources including, but are not limited to, topographic maps, GIS modeling, construction plans, and existing hydrologic studies. The Engineer shall not use existing hydrologic studies without assessing of their validity. If necessary, obtain additional information such as local rainfall from official sites such as airports. e. The plan set must include, at a minimum, the “design” frequency to be specified in the Work Authorization and the 1% AEP storm frequency. The report must include the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP). Perform scour evaluations for both the 100yr and 500yr frequencies. f. Compare calculated discharges to the effective FEMA flows. If calculated discharges are to be used in the model instead of the effective FEMA flows, full justification must be documented.

Roadway Design. The Engineer shall prepare roadway plans, profiles and typical sections for the proposed improvements as requested by the State. Prior to the 30% submittal the Engineer shall schedule a workshop to review profiles and cross-sections with the State. The profile and cross sections shall depict the 2, 5, 10, 25, 50, 100 and 500 year (if available) water surface elevations. The drawings must DocuSign Envelope ID: 5410F844-7202-4C91-B48D-AEAE41F0DC79 provide an overall view of the roadway and existing ground elevations with DocuSign Envelope ID: F3F854F6-FE6A-49D4-9872-9DC2363FC73E respect to the various storm design frequencies for the length of the project. This must enable the State to determine the most feasible proposed roadway profile. The State approval of the proposed profiles and cross sections must be procured before the Engineer continues with the subsequent submittals. The roadway plans must be complete and organized in accordance with the latest edition of the State’s PS&E Preparation Manual. A. DRAINAGE DESIGN 1. DATA COLLECTIONCOLLECTION The Engineer shall provide the following data collection services: a. Conduct field inspections to observe current conditions and the outfall channels, the cross drainage structures, drainage easements, the tributary channel, and land development projects that contribute flow to the tributary. Document field inspections with digital photos. b. Collect available applicable data including GIS data and maps, site survey data, construction plans, previous reports and studies, and readily available rainfall history for the area. Particular sources of data collected must include, but are not limited to, the State, County, and Federal Emergency Management Agency (FEMA). c. Collect available Flood Insurance Rate Maps (FIRMs), Flood Insurance Study (FIS) study data, and any effective HECRAS or HEC-2 models. d. Review survey data and coordinate any additional surveying needs with State. e. At the State’s request, existing drainage structures shall be represented in a 3D MicroStation model. f. Meet with local government officials to obtain historical flood records. Interview local residents or local government employees to obtain additional high-water information if available. Obtain frequency of road closure and any additional high-water information from the District Maintenance office. g. f. Submit a letter report to the State Project Manager detailing completion of data collection. DocuSign Envelope ID: F3F854F6-FE6A-49D4-9872-9DC2363FC73E 2. HYDROLOGIC STUDIES The Engineer shall provide the following services: a. Incorporate in the hydrologic study a thorough evaluation of the methodology available, comparison of the results of two or more methods, and calibration of results against measured data, if available. b. Calculate discharges using appropriate hydrologic methods, as included in this document or as approved by the STATE. c. Consider the pre-construction and post-construction conditions in the hydrologic study, as required in the individual Work Authorization. The additional lanes may be accounted for by increasing percent development or by a higher curve number, as deemed appropriate for the site. d. Obtain the drainage area boundaries and hydrologic parameters such as impervious covered areas, and overland flow paths and slopes from appropriate sources including, but are not limited to, topographic maps, GIS modeling, construction plans, and existing hydrologic studies. The Engineer shall not use existing hydrologic studies without assessing of their validity. If necessary, obtain additional information such as local rainfall from official sites such as airports. e. The plan set must include, at a minimum, the “design” frequency to be specified in the Work Authorization and the 1% AEP storm frequency. The report must include the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP). Perform scour evaluations for both the 100yr and 500yr frequencies. f. Compare calculated discharges to the effective FEMA flows. If calculated discharges are to be used in the model instead of the effective FEMA flows, full justification must be documented.

Roadway Design. The Engineer shall prepare roadway plans, profiles and typical sections for the proposed improvements as requested by the State. Prior to the 30% submittal the Engineer shall schedule a workshop to review profiles and cross-sections with the State. The profile and cross sections shall depict the 2, 5, 10, 25, 50, 100 and 500 year (if available) water surface elevations. The drawings must provide an overall view of the roadway and existing ground elevations with DocuSign Envelope ID: F3F854F6D57C0630-FE6A-49D4A6B0-98724C90-9DC2363FC73E AD28-4D3AAC913D02 respect to the various storm design frequencies for the length of the project. This must enable the State to determine the most feasible proposed roadway profile. The State approval of the proposed profiles and cross sections must be procured before the Engineer continues with the subsequent submittals. The roadway plans must be complete and organized in accordance with the latest edition of the State’s PS&E Preparation Manual. A. DRAINAGE DESIGN 1. DATA COLLECTION a. Conduct field inspections to observe current conditions and the outfall channels, the cross drainage structures, drainage easements, the tributary channel, and land development projects that contribute flow to the tributary. Document field inspections with digital photos. b. Collect available applicable data including GIS data and maps, site survey data, construction plans, previous reports and studies, and readily available rainfall history for the area. Particular sources of data collected must include, but are not limited to, the State, County, and Federal Emergency Management Agency (FEMA). c. Collect available Flood Insurance Rate Maps (FIRMs), Flood Insurance Study (FIS) study data, and any effective HECRAS or HEC-2 models. d. Review survey data and coordinate any additional surveying needs with State. e. At the State’s request, existing drainage structures shall be represented in a 3D MicroStation model. f. Meet with local government officials to obtain historical flood records. Interview local residents or local government employees to obtain additional high-water information if available. Obtain frequency of road closure and any additional high-water information from the District Maintenance office. g. Submit a letter report to the State Project Manager detailing completion of data collection. DocuSign Envelope ID: F3F854F6D57C0630-FE6A-49D4A6B0-98724C90-9DC2363FC73EAD28-4D3AAC913D02 2. HYDROLOGIC STUDIES The Engineer shall provide the following services: a. Incorporate in the hydrologic study a thorough evaluation of the methodology available, comparison of the results of two or more methods, and calibration of results against measured data, if available. b. Calculate discharges using appropriate hydrologic methods, as included in this document or as approved by the STATE. c. Consider the pre-construction and post-construction conditions in the hydrologic study, as required in the individual Work Authorization. The additional lanes may be accounted for by increasing percent development or by a higher curve number, as deemed appropriate for the site. d. Obtain the drainage area boundaries and hydrologic parameters such as impervious covered areas, and overland flow paths and slopes from appropriate sources including, but are not limited to, topographic maps, GIS modeling, construction plans, and existing hydrologic studies. The Engineer shall not use existing hydrologic studies without assessing of their validity. If necessary, obtain additional information such as local rainfall from official sites such as airports. e. The plan set must include, at a minimum, the “design” frequency to be specified in the Work Authorization and the 1% AEP storm frequency. The report must include the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP). Perform scour evaluations for both the 100yr and 500yr frequencies. f. Compare calculated discharges to the effective FEMA flows. If calculated discharges are to be used in the model instead of the effective FEMA flows, full justification must be documented.

Roadway Design. The Engineer shall prepare roadway plans, profiles and typical sections for the proposed improvements as requested by the State. Prior to the 30% submittal the Engineer shall schedule a workshop to review profiles and cross-sections with the State. The profile and cross sections shall depict the 2, 5, 10, 25, 50, 100 and 500 year (if available) water surface elevations. The drawings must provide an overall view of the roadway and existing ground elevations with DocuSign Envelope ID: F3F854F6F707DECA-9FA0-FE6A-49D44A6C-8013-9872-9DC2363FC73E 4547938899C1 respect to the various storm design frequencies for the length of the project. This must enable the State to determine the most feasible proposed roadway profile. The State approval of the proposed profiles and cross sections must be procured before the Engineer continues with the subsequent submittals. The roadway plans must be complete and organized in accordance with the latest edition of the State’s PS&E Preparation Manual. A. DRAINAGE DESIGN 1. DATA COLLECTION a. Conduct field inspections to observe current conditions and the outfall channels, the cross drainage structures, drainage easements, the tributary channel, and land development projects that contribute flow to the tributary. Document field inspections with digital photos. b. Collect available applicable data including GIS data and maps, site survey data, construction plans, previous reports and studies, and readily available rainfall history for the area. Particular sources of data collected must include, but are not limited to, the State, County, and Federal Emergency Management Agency (FEMA). c. Collect available Flood Insurance Rate Maps (FIRMs), Flood Insurance Study (FIS) study data, and any effective HECRAS or HEC-2 models. d. Review survey data and coordinate any additional surveying needs with State. e. At the State’s request, existing drainage structures shall be represented in a 3D MicroStation model. f. Meet with local government officials to obtain historical flood records. Interview local residents or local government employees to obtain additional high-water information if available. Obtain frequency of road closure and any additional high-water information from the District Maintenance office. g. Submit a letter report to the State Project Manager detailing completion of data collection. DocuSign Envelope ID: F3F854F6F707DECA-9FA0-FE6A-49D44A6C-8013-9872-9DC2363FC73E4547938899C1 2. HYDROLOGIC STUDIES The Engineer shall provide the following services: a. Incorporate in the hydrologic study a thorough evaluation of the methodology available, comparison of the results of two or more methods, and calibration of results against measured data, if available. b. Calculate discharges using appropriate hydrologic methods, as included in this document or as approved by the STATE. c. Consider the pre-construction and post-construction conditions in the hydrologic study, as required in the individual Work Authorization. The additional lanes may be accounted for by increasing percent development or by a higher curve number, as deemed appropriate for the site. d. Obtain the drainage area boundaries and hydrologic parameters such as impervious covered areas, and overland flow paths and slopes from appropriate sources including, but are not limited to, topographic maps, GIS modeling, construction plans, and existing hydrologic studies. The Engineer shall not use existing hydrologic studies without assessing of their validity. If necessary, obtain additional information such as local rainfall from official sites such as airports. e. The plan set must include, at a minimum, the “design” frequency to be specified in the Work Authorization and the 1% AEP storm frequency. The report must include the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP). Perform scour evaluations for both the 100yr and 500yr frequencies. f. Compare calculated discharges to the effective FEMA flows. If calculated discharges are to be used in the model instead of the effective FEMA flows, full justification must be documented.

Roadway Design. The Engineer shall prepare roadway plans, profiles and typical sections for the proposed improvements as requested by the State. Prior to the 30% submittal the Engineer shall schedule a workshop to review profiles and cross-sections with the State. The profile and cross sections shall depict the 2, 5, 10, 25, 50, 100 and 500 year (if available) water surface elevations. The drawings must provide an overall view of the roadway and existing ground elevations with DocuSign Envelope ID: F3F854F6CCFE3302-FE6A-49D482A5-9872-9DC2363FC73E 48DE-9B9A-8BCFBEBFCC46 respect to the various storm design frequencies for the length of the project. This must enable the State to determine the most feasible proposed roadway profile. The State approval of the proposed profiles and cross sections must be procured before the Engineer continues with the subsequent submittals. The roadway plans must be complete and organized in accordance with the latest edition of the State’s PS&E Preparation Manual. A. DRAINAGE DESIGN 1. DATA COLLECTION a. Conduct field inspections to observe current conditions and the outfall channels, the cross drainage structures, drainage easements, the tributary channel, and land development projects that contribute flow to the tributary. Document field inspections with digital photos. b. Collect available applicable data including GIS data and maps, site survey data, construction plans, previous reports and studies, and readily available rainfall history for the area. Particular sources of data collected must include, but are not limited to, the State, County, and Federal Emergency Management Agency (FEMA). c. Collect available Flood Insurance Rate Maps (FIRMs), Flood Insurance Study (FIS) study data, and any effective HECRAS or HEC-2 models. d. Review survey data and coordinate any additional surveying needs with State. e. At the State’s request, existing drainage structures shall be represented in a 3D MicroStation model. f. Meet with local government officials to obtain historical flood records. Interview local residents or local government employees to obtain additional high-water information if available. Obtain frequency of road closure and any additional high-water information from the District Maintenance office. g. Submit a letter report to the State Project Manager detailing completion of data collection. DocuSign Envelope ID: F3F854F6CCFE3302-FE6A-49D482A5-9872-9DC2363FC73E 2. HYDROLOGIC STUDIES The Engineer shall provide the following services: a. Incorporate in the hydrologic study a thorough evaluation of the methodology available, comparison of the results of two or more methods, and calibration of results against measured data, if available. b. Calculate discharges using appropriate hydrologic methods, as included in this document or as approved by the STATE. c. Consider the pre-construction and post-construction conditions in the hydrologic study, as required in the individual Work Authorization. The additional lanes may be accounted for by increasing percent development or by a higher curve number, as deemed appropriate for the site. d. Obtain the drainage area boundaries and hydrologic parameters such as impervious covered areas, and overland flow paths and slopes from appropriate sources including, but are not limited to, topographic maps, GIS modeling, construction plans, and existing hydrologic studies. The Engineer shall not use existing hydrologic studies without assessing of their validity. If necessary, obtain additional information such as local rainfall from official sites such as airports. e. The plan set must include, at a minimum, the “design” frequency to be specified in the Work Authorization and the 1% AEP storm frequency. The report must include the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP). Perform scour evaluations for both the 100yr and 500yr frequencies. f. Compare calculated discharges to the effective FEMA flows. If calculated discharges are to be used in the model instead of the effective FEMA flows, full justification must be documented.48DE-9B9A-8BCFBEBFCC46

Roadway Design. The Engineer shall prepare roadway plans, profiles and typical sections for the proposed improvements as requested by the State. Prior to the 30% submittal the Engineer shall schedule a workshop to review profiles and cross-sections with the State. The profile and cross sections shall depict the 2, 5, 10, 25, 50, 100 and 500 year (if available) water surface elevations. The drawings must DocuSign Envelope ID: 2136EF24-41E3-476A-9DE8-B6DB65099AD1 provide an overall view of the roadway and existing ground elevations with DocuSign Envelope ID: F3F854F6-FE6A-49D4-9872-9DC2363FC73E respect to the various storm design frequencies for the length of the project. This must enable the State to determine the most feasible proposed roadway profile. The State approval of the proposed profiles and cross sections must be procured before the Engineer continues with the subsequent submittals. The roadway plans must be complete and organized in accordance with the latest edition of the State’s PS&E Preparation Manual. A. DRAINAGE DESIGN 1. DATA COLLECTIONCOLLECTION The Engineer shall provide the following data collection services: a. Conduct field inspections to observe current conditions and the outfall channels, the cross drainage structures, drainage easements, the tributary channel, and land development projects that contribute flow to the tributary. Document field inspections with digital photos. b. Collect available applicable data including GIS data and maps, site survey data, construction plans, previous reports and studies, and readily available rainfall history for the area. Particular sources of data collected must include, but are not limited to, the State, County, and Federal Emergency Management Agency (FEMA). c. Collect available Flood Insurance Rate Maps (FIRMs), Flood Insurance Study (FIS) study data, and any effective HECRAS or HEC-2 models. d. Review survey data and coordinate any additional surveying needs with State. e. At the State’s request, existing drainage structures shall be represented in a 3D MicroStation model. f. Meet with local government officials to obtain historical flood records. Interview local residents or local government employees to obtain additional high-water information if available. Obtain frequency of road closure and any additional high-water information from the District Maintenance office. g. f. Submit a letter report to the State Project Manager detailing completion of data collection. DocuSign Envelope ID: F3F854F6-FE6A-49D4-9872-9DC2363FC73E 2. HYDROLOGIC STUDIES The Engineer shall provide the following services: a. Incorporate in the hydrologic study a thorough evaluation of the methodology available, comparison of the results of two or more methods, and calibration of results against measured data, if available. b. Calculate discharges using appropriate hydrologic methods, as included in this document or as approved by the STATE. c. Consider the pre-construction and post-construction conditions in the hydrologic study, as required in the individual Work Authorization. The additional lanes may be accounted for by increasing percent development or by a higher curve number, as deemed appropriate for the site. d. Obtain the drainage area boundaries and hydrologic parameters such as impervious covered areas, and overland flow paths and slopes from appropriate sources including, but are not limited to, topographic maps, GIS modeling, construction plans, and existing hydrologic studies. The Engineer shall not use existing hydrologic studies without assessing of their validity. If necessary, obtain additional information such as local rainfall from official sites such as airports. e. The plan set must include, at a minimum, the “design” frequency to be specified in the Work Authorization and the 1% AEP storm frequency. The report must include the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP). Perform scour evaluations for both the 100yr and 500yr frequencies. f. Compare calculated discharges to the effective FEMA flows. If calculated discharges are to be used in the model instead of the effective FEMA flows, full justification must be documented.

Roadway Design. The Engineer shall prepare roadway plans, profiles and typical sections for the proposed improvements as requested by the State. Prior to the 30% submittal the Engineer shall schedule a workshop to review profiles and cross-sections with the State. The profile and cross sections shall depict the 2, 5, 10, 25, 50, 100 and 500 year (if available) water surface elevations. The drawings must DocuSign Envelope ID: 892480A0-816A-4F72-BEA4-A48D7E8902E6 provide an overall view of the roadway and existing ground elevations with DocuSign Envelope ID: F3F854F6-FE6A-49D4-9872-9DC2363FC73E respect to the various storm design frequencies for the length of the project. This must enable the State to determine the most feasible proposed roadway profile. The State approval of the proposed profiles and cross sections must be procured before the Engineer continues with the subsequent submittals. The roadway plans must be complete and organized in accordance with the latest edition of the State’s PS&E Preparation Manual. A. DRAINAGE DESIGN 1. DATA COLLECTIONCOLLECTION The Engineer shall provide the following data collection services: a. Conduct field inspections to observe current conditions and the outfall channels, the cross drainage structures, drainage easements, the tributary channel, and land development projects that contribute flow to the tributary. Document field inspections with digital photos. b. Collect available applicable data including GIS data and maps, site survey data, construction plans, previous reports and studies, and readily available rainfall history for the area. Particular sources of data collected must include, but are not limited to, the State, County, and Federal Emergency Management Agency (FEMA). c. Collect available Flood Insurance Rate Maps (FIRMs), Flood Insurance Study (FIS) study data, and any effective HECRAS or HEC-2 models. d. Review survey data and coordinate any additional surveying needs with State. e. At the State’s request, existing drainage structures shall be represented in a 3D MicroStation model. f. Meet with local government officials to obtain historical flood records. Interview local residents or local government employees to obtain additional high-water information if available. Obtain frequency of road closure and any additional high-water information from the District Maintenance office. g. f. Submit a letter report to the State Project Manager detailing completion of data collection. DocuSign Envelope ID: F3F854F6-FE6A-49D4-9872-9DC2363FC73E 2. HYDROLOGIC STUDIES The Engineer shall provide the following services: a. Incorporate in the hydrologic study a thorough evaluation of the methodology available, comparison of the results of two or more methods, and calibration of results against measured data, if available. b. Calculate discharges using appropriate hydrologic methods, as included in this document or as approved by the STATE. c. Consider the pre-construction and post-construction conditions in the hydrologic study, as required in the individual Work Authorization. The additional lanes may be accounted for by increasing percent development or by a higher curve number, as deemed appropriate for the site. d. Obtain the drainage area boundaries and hydrologic parameters such as impervious covered areas, and overland flow paths and slopes from appropriate sources including, but are not limited to, topographic maps, GIS modeling, construction plans, and existing hydrologic studies. The Engineer shall not use existing hydrologic studies without assessing of their validity. If necessary, obtain additional information such as local rainfall from official sites such as airports. e. The plan set must include, at a minimum, the “design” frequency to be specified in the Work Authorization and the 1% AEP storm frequency. The report must include the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP). Perform scour evaluations for both the 100yr and 500yr frequencies. f. Compare calculated discharges to the effective FEMA flows. If calculated discharges are to be used in the model instead of the effective FEMA flows, full justification must be documented.