Development Of A Computer Design System For Irrigation District Planning

With the use of the latest programming language, a computer design system for the planning of irrigation districts is developed in this thesis. This system integrates Visual Basic with AutoCAD, Microsoft Excel and other application software, including such six modules as determination of irrigation parameter, irrigation canal system, drainage canal system, evaluation of engineering cost and economic analysis. Depending upon the requirements of irrigation district planning and through man-machine conversations, calculations in design, cross-sectional drawing of canals and printing of design results can be automatically done.The dynamic programming model for water conveying and distribution system design is firstly presented in this thesis in the aspect of systematic optimization. Taking the minimum earthwork or total cost as objectives, the longitudinal and transverse cross sections of two-stage and more canal system can be optimized to obtain optimal canal slops and relevant parameters, which will satisfy the restraints of water levels without erosion and sediment. On the basis of statistical analyses of main structures, a regressive equation between quantities of work and design parameters is established. The design system is highly practicable that with the help of this system the planning of irrigation districts will be simpler and more convenient, and the design efficiency can be improved remarkably.