Common use of Hydrologic Studies Clause in Contracts

Hydrologic Studies. The Consultant 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. 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. The additional lanes must 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 such as, topographic maps, GIS modeling, construction plans, and existing hydrologic studies. The Consultant shall not use existing hydrologic studies without assessing of their validity. Obtain additional local rainfall from official sites such as airports. e. 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.