In the planning and design of gravity water transfer system, the combined pattern of pressure free pipe and canal with pressured pipe line is sometimes adopted to carry out water transfer.
在重力输水系统的规划设计中，有时采用无压管渠与压力管道相结合的方式输水。
This system can carry out four functions as data base management, planning water use, water allocation in canal system and summation of planning water use.
该系统可以实现：灌区数据管理、灌区用水计划、灌区渠系水量调配和灌区计划用水总结四项功能。
Canal system planning is one of the important tasks in rehabilitation, corollary and water-saving reform planning of large-sized irrigation districts.
渠系规划是大型灌区续建配套与节水改造规划的重要内容。
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