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Stormwater Management Objectives

NCDENR Stormwater BMP Manual Chapter Revised 06-16-09. 3. Stormwater Calculations Stormwater Management Objectives The objective of BMPs is to minimize the adverse effects of development by mimicking, as closely as possible, the runoff characteristics of the site in its undeveloped state. These characteristics include: Moderation of runoff peak flows and volumes to minimize downstream erosion and damage to in-stream aquatic habitat. Removal of pollutants such as sediment, nutrients, pathological bacteria and heavy metals.

Jun 16, 2009 · The curve number, CN, describes the characteristics of the drainage area that determine the amount of runoff generated by a given storm: hydrologic soil group and ground cover. Soils are classified into four hydrologic soil groups (A, B, C, and D) based on their minimum infiltration rate, with A having the highest infiltration potential and D

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