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B. Stormwater Calculations - NC

NCDEQ Stormwater Design Manual _____ B. Stormwater Calculations 1 Revised: 3-15-2017 B. Stormwater Calculations Stormwater programs in North Carolina require high density projects to treat the design storm depth in a Stormwater control measure (SCM). To size the SCM, the designer must calculate the volume of runoff that will drain to it. Additional Calculations are needed to design the outlet structures of SCMs. The Stormwater rules do not reference any calculation methods. This chapter provides technical guidance for Stormwater calculation methods that are typically used in North Carolina. Table of Contents Rational Method for Peak Flow Simple Method for Runoff Volume Discrete NRCS Curve Number Method for Runoff Depth Stage-Storage Tables for Storage Volume of Ponds Weir Equations for Outlet Flow Orifice Equation for Outlet Flow Chainsaw Routing for Stage-Storage-Discharge Other Models for Stage-Storage-Discharge Manning Equation for Channel Flow Rational Method for Peak Flow Qp = C * I * A Where: Qp = Peak flow for the storm of interest (cfs) C = Composite runoff coefficient

1. Divide the drainage area into land uses and assign an appropriate curve number, CN, to each one (see Table 4). The CN is a value between 30 and 98 that characterizes the amount of runoff generated by a drainage area based on its USGS Hydrologic Soil …

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