Runoff Curve Number

Written by Jerry Ratzlaff on . Posted in Geotechnical Engineering

Runoff curve number, abbreviated as CN, a dimensionless number, is the water flow that occurs when the soil is infiltrated to full capacity and excess water or rain.


Runoff Curve Number Formula

\(\large{ CN = \frac{ 1000 }{ S \;+\; 10 }  }\)   


\(\large{ CN }\) = runoff curve number

\(\large{ S } \) = the potential maximum soil moisture retention after runoff begins


Tags: Equations for Soil Equations for Geotechnical