Additional arguments for modification of the national formula for runoff from small agricultural areas

The need for classification of the factors involved in the computation of runoff from small agricultural areas by using an expanded formula, is demonstrated. Factors are, precipitation intensity, soil condition, vegetative cover, infiltration rate together with time of occurrence and duration, with area involved, all must be used to clarify the simple formula without relying on a heavily weighted all covering constant. Tables and graphical examples are use to illustrate the development of flood hydrograph reproduction. The process is discussed by A. F. Pillsbury, J. B. Brown and R. W. Gerdel.