Admin Order 58-16-01 - Laserfiche WebLink

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2.04 STORMWATER Stormwater management facilities required under provisions of Chapter 9 shall be designed in accordance with the Stormwater Management Manual, City's Stormwater Basin Master Plans, Standard Specifications and Drawings, Eugene Code Chapters 6 and 7, and the following standards. A. Analysis (Stormwater Study) A stormwater study shall be submitted for all stormwater systems that carry runoff from more than one acre of land. The study shall include all of the following elements. 1. A hydrology map containing the following: a. The entire drainage basin boundary and 100 feet of area beyond the drainage basin limits. b. All sub -basins shall be delineated with symbols that are labeled and readable when electronically scanned. c. Drainage areas of all sub -basins (in acres). d. Streets important to the study and street names. e. Flow path or direction arrows in streets, pipes, streams, and ditches. f. Contours or spot elevations for verification of direction of overland flow and pipe cover. g. Collection points (nodes) at downstream limits of all sub -basins, with node numbers. h. Existing and proposed storm drain pipes with material type and sizes included. L Future pipes in the system, complete with proposed sizes, slopes, pipe cover, flow line elevations at manholes. j. City drainage master plan information such as node numbers, basin names, and drainage boundaries. k. Existing and proposed surface water features and drainage systems, including but not limited to: streams, wetlands, drainage channels, and stormwater conveyance/treatment systems. I. Legend details such as north arrow, scale, company name/logo, designer, and date. 2. Hydrologic calculations to establish runoff flow amounts. 3. Hydraulic calculations to establish pipe size, waterway cross-section, flow velocity, and hydraulic grade line (HGL). Public Improvement Design Standards Manual, 2016 Page 2-10