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Useful Tables
NRCS (SCS) Curve Numbers, Manning's n-values, Runoff Coefficients and more
NRCS Curve Numbers (CN)
Curve Numbers for NRCS hydrographs
Runoff Coefficients (C)
Runoff coefficients for use in Rational method
Manning’s n-values
Table of Manning's n-values
Standard Elliptical Pipe Dimensions
Elliptical pipes and their round equivalents