Runoff Process of Rainwater in Small Mountainous Basin

Abstract

The channel flow is considered as the rainfall which passes through the infiltration area, where the distribution of pores is assumed as fractal. Using these assumption and the estimation of the characteristics of slope distribution, the method of the lumping of a hillside and the value of fractal number δ of the pores of the infiltration area in a hillside (δ=1.8) are obtained. It is also found that in mountainous basins where the areas are less than 0.2km² the delay of runoff is nearly 20 minutes and that the Manning's coefficient n is nearly 0.05 (m^-1/3·s).