Transcription of B. Stormwater Calculations - NC
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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.
impervious areas and curve-fitting a relationship between percent imperviousness and the fraction of rainfall converted to runoff (the runoff coefficient). It uses a minimal amount of information to estimate the volume of runoff. A couple of …
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