Computer-aided Design System Based On Gis Tree Low Pressure Water Delivery Irrigation Pipe Network

In north China, the low pressure pipeline irrigation, was mostly used and it was advanced developed in project design, the industry of pipe and pipefitting, the irrigation management, and had formed some system. The ministry of water resource had put forward the standard of Low pressure pipeline irrigation project design and engage in construction for north China. But the low pressure pipeline technique is not widely used in north China, the main reasons are the irrigation are is more larger the north China, and the low pressure pipeline irrigation system is very large , the corresponding pipe, pipefitting is very lack, all these make the use of low pressure irrigation in south China very little, and now there is still not the standard of low pressure pipeline irrigation for south China.The low pressure pipe line irrigation is a kind very important water saving project method, it's many merits such as water saving, energy saving, saving field high adaptability and so on compared with the traditional channel irrigation method. The low pressure pipe line irrigation technique has been accepted by many countries and been widely used. Aimed at the current problem of pipeline layout optimization technique ,The research of irrigation pipeline layout and pipe diameter optimization has been done , the GIS(Geography Information System ) and graph theory were first put forwarded to applyed to the design of low pressure pipeline irrigation project in the paper .With the support of GIS , the minimal spanning tree theory of graph theory and 120 project theory can be applied to irrigation pipeline's layout optimization .At the aspect of pipe diameter optimization, simplicial method and interior-point method are been used in solve liner optimization model of pipe diameter to reach minimum project cost or annual working cost of low pressure pipeline irrigation. On the basis of thinking above.Base on the thought above, it's very necessary to development the software of computer aided design (CAD) system of low pressure pipeline based on GIS. In the paper , the research of that has been done, and the software of CAD system of low pressure pipeline based on GIS had been developed by using develop tools such as Delphi, MapX, AutoCAD and Access. The function of the software is useful, it has provided many functions such as the calculate of crop water requirement , pipelinelayout(automatic layout and manual operation )and its optimization , pipe diameter optimization .investment budgetary estimate and economic beneficial result can be result .and can rapid create plan and do plan comparison, the software provides many kinds of result output such as graph .text, table and so on. The software can greatly reduce the manual labour, improve the efficiency of the project design.