Run-Off Analysis in Tsuda River Basin

This report deals with the run-off analysis in Tsuda river basin order to investigate the adequancy of Tategami's method for small river like this, As shown in Fig. 15, calculated value is not entirely coincide with measured value. This difference between them is caused by the incompletion of assumptopns as follows 1) Basic assumption of unit hydrograph. 2) Arrival time T is proportional to 0.7 power of distance L. 3) Method of division of effective rainfall from the total rainfall. However, the peak discharge which is the most important point gave sufficient result. We alsp could find the recession constant in Tsuda river basin is 4.0 (hr) and for rainfall is over 150mm, water loses become constant with the value of 53mm.