Hydrology and Runoff

In the USDA SCS Curve Number method, the relationship between maximum potential soil water retention $S$ (in mm) and Curve Number $CN$ is:

Options:

• (A) $S = \frac{25400}{CN} - 254$
• (B) $S = \frac{1000}{CN} - 10$
• (C) $S = 254 \left(1 - \frac{CN}{100}\right)$
• (D) $S = \frac{25400}{100 - CN}$