Rainwater Harvesting for Agriculture in Rainfed Area of the Loess Plateau
黄土高原雨养农业区雨水集蓄应用研究

The result of the rainwater harvesting test on the ten runoff zones-with slopes of 5 degrees and 15 degrees and covered with three -in-one soil,compacted soil and natural soil respectively, shows that the runoff coefficient is determined by rainfall intensity,slope and so on. The runoff coefficient is 72%-77% on the plastic and cement runoff zones and 5%-18% on the other runoff zones.Moreover,based on the calculated and test result,the test scheme-called furrow-culture and ridge-covered was carried out and the amount of increase in production is very notable.Meanwhile,according to the dependable rainfall,mean runoff coefficient and wheat water requirement,the ratio of harvesting area to planting area is calculated for the four representative stations and the value is 0.5-0.8.