Test-analysis And Application Of Irrigation Water Use Efficiency Of Zhejiang Province

The utilization efficiency of agriculture irrigation water is not only a key index to evaluate the efficiency of agriculture water, but also the basic parameter for hydrology engineering and water management, which plays an very important role in agriculture water-saving irrigation. However, the theory of irrigation water utilization efficiency is quite controversial in and abroad. Large scale irrigation water in water delivery, water management and the efficiency in the field is short of scientific theory and methods. This article analyses the basic theory and the efficiency in each procedure of irrigation water, and the main contents and conclusions are listed below:1) Based on the process of water use and water-saving irrigation theory, the definition of irrigation water utilization efficiency is analyzed and the method of calculating irrigation water efficiency based on deficit irrigation theory is proposed.2) Combining the connotation of water use process and irrigation water efficiency, several problems in our existing system in our country are identified according to the Australia NIEC index system. The methods of determining each index are improved and appropriate irrigation water utilization efficiency system is proposed3)By testing, analyzing the water use efficiency of the main kind channel in Zhejiang, the relation between canal capacity and water delivery efficiency is established for 9 major kinds of channel, on which a table is made for check.4) According to the physical process of water delivery, a forward recursive method is proposed, which solve the problems in the area where there is not sufficient data.5) By establishing the relation between canal water delivery efficiency and lining rate, area weighted average method is applied to realize the conversion between point and area. The connection among water delivery efficiency, seepage rate and invest scale.6)By determining the water-saving efficiency in each procedure in Zhejiang province, strategies and measures on aspects of agriculture hydrology constructions, water management and water-saving irrigation.