Common use of Drainage Clause in Contracts

Drainage. The Engineer shall use data from as-built plans and FEMA maps to locate drainage out fall(s) and to determine existing storm sewer and culvert sizes, design flows, and water surface elevations for use in the design of roadway geometry. The Engineer shall conduct a Preliminary Drainage Study to determine and evaluate the adequacy of the ROW needed to accommodate the proposed roadway and drainage system. The drainage study shall identify the impacts to abutting properties and the 100-year floodplain due to proposed highway improvements, identify the water surface elevations for the 2, 5, 10, 25, 50 and 100 year storm events, identify and locate outfalls, drainage outfall descriptions, provide overall drainage area map, sub-drainage area map, storm water detention facilities, and provide a drainage study report identifying the results of the study. The drainage report, signed and sealed by a professional engineer, shall include applicable hydrologic and hydraulic models such as HEC-1 and HEC-2, HEC-RAS, HEC-HMS, XP-SWMM, and other applicable models. If requested, the Engineer shall prepare a Final Drainage Study in accordance with the State’s Hydraulic Design Manual, District criteria, and any specific guidance provided by the State. The Engineer shall not evaluate the adequacy of the existing drainage structures, unless directed by the State.

Drainage. The Engineer shall use data from as-built plans and FEMA maps to locate drainage out fall(s) and to determine existing storm sewer and culvert sizes, design flows, and water surface elevations for use in the design of roadway geometry. The Engineer shall conduct a Preliminary Drainage Study to determine and evaluate the adequacy of the ROW needed to accommodate the proposed roadway and drainage system. The drainage study shall identify the impacts to abutting properties and the 100-year floodplain due to proposed highway improvements, identify the water surface elevations for the 2, 5, 10, 25, 50 and 100 year storm events, identify and locate outfalls, drainage outfall descriptions, provide overall drainage area map, sub-drainage area map, storm water detention facilities, and provide a drainage study report identifying the results of the study. The drainage report, signed and sealed by a professional engineer, shall include applicable hydrologic and hydraulic models such as HEC-1 and HEC-2, HEC-HEC- RAS, HEC-HMS, XP-SWMM, and other applicable models. If requested, the Engineer shall prepare a Final Drainage Study in accordance with the State’s Hydraulic Design Manual, District criteria, and any specific guidance provided by the State. The Engineer shall not evaluate the adequacy of the existing drainage structures, unless directed by the State.

Drainage. The Engineer shall use data from as-built as‐built plans and FEMA maps to locate drainage out fall(s) outfalls and to determine existing storm sewer and culvert sizes, design flows, and water surface elevations for use in the design of roadway geometry. The Engineer shall conduct a Preliminary Drainage Study to determine and evaluate the adequacy of the ROW needed to accommodate the proposed roadway and drainage system. The preliminary drainage study shall must identify the impacts to abutting properties and the 100-year 100‐year floodplain due to proposed highway improvements, identify the water surface elevations for the 2, 5, 10, 25, 50 and 100 year storm events, identify and locate outfalls, drainage outfall descriptions, provide overall drainage area map, sub-drainage sub‐drainage area map, storm water detention facilities, and provide a drainage study report identifying the results of the study. The drainage report, must be signed and sealed by a professional engineer, shall and must include applicable hydrologic and hydraulic models such as HEC-1 HEC‐1 and HEC-2HEC‐2, HEC-RASHEC‐RAS, HEC-HMSHEC‐HMS, XP-SWMMXP‐SWMM, and other applicable models. If requested, the Engineer shall prepare a Final Drainage Study in accordance with the State’s Hydraulic Design Manual, District district criteria, and any specific guidance provided by the State. The Engineer shall not evaluate determine the adequacy of the existing drainage cross‐drainage structures, unless directed by . The Engineer shall also provide recommendations for the Stateproposed cross‐drainage structures to meet the hydraulic design criteria.