total runoff
2.According to the first stage project of the western route of the south-to-north water transfer scheme, water of 4 billions m3 transfers annually from six branches of the Yalong River and Dadu River to the Yellow River. The transferred water accounts for 60%70% of the total river runoff in the water-exporting regions, and the remnant acts as eco-environment water of the channels.
8.The research for soil permeability and surface runoff in Huangjia-Er- cha small watershed in Xiji county, Ningxia, was done by means of arti- ficial precipitation and runoff-plot testing method,which showed that pri- mary factors affecting soil permeability are land utilization, slop, soil moisture, total porosity of soil and rain intensity.

