Runoff Curve Number
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 |
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\(\large{ CN = \frac{ 1000 }{ S \;+\; 10 } }\) | ||
Symbol | English | Metric |
\(\large{ CN }\) = runoff curve number | \(\large{dimensionless}\) | |
\(\large{ S } \) = the potential maximum soil moisture retention after runoff begins | \(\large{lbf}\) | \(\large{N}\) |
Tags: Soil Equations