Study On The Irrigation And Drainage And Optimal Allocation Of Water Resources For The North Of Huaihe River In Anhui Province

On the theory and method of farm hydrodynamics and hydrology and water resources system engineering , the paper covers three topics study about the techniques of farm draining (topic one) , and soil moisture measuring and forecasting and drought preventing inforwaton system (topic 2), and water resources optimal allocation (topic 3) , in the light of the flood and the drought and the shortage of water resources in the north of Anhui Province.In the topic 1, utilizing the natural lysimeters and drainage region in Wudaogou station , based on expriment and imitation methods, frist the hydrology effect of drainage has been analyzed , and then the index of water logged farm drainage and suitable ground water level have been provided. On the theory of Darcy rule and farm hydrodynamics, the standard and pattern and empirical formula of farm drainage system have been presented as well, and provide scientifically foundation for drainage planning.In the topic 2 , based on the theory of rain-runoff and soil water moving ,a practical soil moisture forecasting model expressed by moisture index has been provided . The techniques of moisture forecasting and drought evaluating have been combined with the techniques of network and GIS, and the detailed way and contents about establishing information system of moisture and drought extent have also been presented, and provide direct services for preventing and controlling drought.Based on mentioned above , as example , the topic 3 selects Weidian irrigation area in the south and chengbei irrgation area in the north in Huaibei Plain , and the maths models have been established with maximal net benefit of annual irrigation as objective according to the method of linear planning of system engineering. By used of the model and analysis of cost and benefit of irrigation system, the best planting construction and engineering system pattern and surface water and ground water allocation have been carried out. In addition, the irrigation net benefit of Kinds of engineering pattern has also been done.