Dynamics and rational adjusting of surface water resources in hilly red soil regions

In the relatively dependent and most integral unit of catchment area in hilly red soil landscape,we study the yearly dynamics of surface water resources including rainfall,evapotranspiration and water storage.The results show that the water volume ratio among soil evapotranspiration,dike and pool storage,drainage from catchment area is about 7:2:1.The water distribution in sloping field of soil and water conservation type among vegetation interception,soil,surface runoff is 3:5:2. And the water storage volume of 1m of 1 hm² unit in sloping field of soil and water conservation type is 864.0-1 067.0 m³ more than non-conservation type in rainy seasons,and 647.0-855.0 m³ more in less rain seasons.The more results show that the water storage volume for agricultural irrigation use is about 12% of yearly rainfall.The dike and pool for storage use should be about 11% of the catchment area.The expanding dyke and pool area to resist seasonal drought is not effective if about 10% of the land area is in hilly red soil regions.The solution is to develop the vast potential of hydraulic engineering and "soil reservoir" effect.