Bridge Stormwater Runoff Analysis and Treatment Options (2014) / Chapter Skim
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Pages 19-23
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From page 19... ...
19 Assessment Procedure This chapter provides a description of a simplified assessment procedure and a more complex assessment procedure if the DOT is required to assess the impact of the bridge crossing on the receiving water as a part of the 404/401 process. The purpose of using these procedures is to provide the DOT with numeric justification for their selected mitigation program.
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From page 20... ...
20 one of many small impervious parcels contributing runoff and, consequently, it is logical that it be subject to the same regulations as other impervious area. That is, the de minimis assessment approach does not apply because of the cumulative impact of many small impervious parcels.
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From page 21... ...
21 Upstream Load Annual discharge of the receiving water Average Stream Concentration = × where the average flow in the receiving water is determined by gauged data at the proposed site or calculated based on a comparison of the upstream catchment area to the flow observed at a gauged location in the vicinity with a known catchment area or computed using one of the many synthetic methods available in public domain programs such as the hydrologic engineering center hydrologic modeling system (HEC-HMS)
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From page 22... ...
22 Equation (1) is a suitable screening test.
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From page 23... ...
23 each of the NOAA tide gauges that dot the coastline of the United States. PT is the period of the tide (or, more precisely, the dominant period)
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