Statistical Analysis of the Components of the Unit Hydrograph

Statistical composition method of the unit hydrograph in case of the farmland drainage (I)

Abstract

Three components of the unit hydrograph are the time of concentration, the time ofrecession and the recession constant, and these three are treated as peculiar to each river basin. The.: refore it is said that the runoff is a linear function and simple proportional to the rainfall intensity.
On the other hand, the usual unit hydrograph is said not to express exactly the actual runoff, because it is a non-linear function.
The writer analized possibe relation between the rainfall intencity and the components of the unit hydrograph, and made several formulas by measured data of 19 rivers, within the scope of the standard of farmland drainage.
These are formula 7, 12 and 14 to be applied also for unmeasured basins.