Common use of Drainage Study Clause in Contracts

Drainage Study. a. HYDROLOGIC/HYDRAULIC MODELING (1 major channel crossing, 7 cross drainage structures assumed): • Prepare hydrologic and hydraulic models or modify existing models (FEMA, drainage districts, river authorities, cities, etc.) if available, to define the drainage infrastructure required for the project. Detail the methodologies employed and recommendations. The analysis will include: preparation of a preliminary design of the right of way drainage system; preliminary sizing of cross drainage structures and major channel crossings to reflect the existing and proposed conditions; recommended minimum pavement elevations based on cross drainage flood elevations; right-of-way requirements; identify potential needs for FEMA Coordination. HEC-RAS shall be utilized for all stream modeling. HY-8 shall be used for non-bridge class culverts. • Develop existing channel cross sections based on data collection. • Exhibits and analysis will be prepared in the GIS environment to the extent practical. • Onsite parallel drainage for ditch and/or storm sewer sizing will only be analyzed to determine project ROW needs. Detailed inlet level calculations are not included in this scope. • Coordinate with the Upper Brushy Creek Water Control Improvement District (UBCWCID) as necessary throughout the project. b. FEMA COORDINATION: • Coordinate with Local Floodplain Administrator as necessary throughout the project.