水系格局改变、围湖造田等这对于防洪除涝造成严重威胁。
Water system changes, reclaiming farmland from lakes, etc, made a serious threat to flood and waterlogging control.
本文应用系统分析理论，为圩区除涝系统最优规划提出了一种非线性规划数学模型。
Applying the theory of system analysis to optimal planning of drainage systems for preventing waterlogging, the authors propose a mathematical model of nonlinear programming.
农业综合开发的重点是改造中低产田，对于低洼易涝地区是除涝治碱，健全排灌系统。
It is important for agricultural synthetic exploitation to improve the poor yield, do away with the flood and alkali of low and stagnant field and perfect the draining and irrigating system.
农业综合开发的重点是改造中低产田，对于低洼易涝地区是除涝治碱，健全排灌系统。
It is important for agricultural synthetic exploitation to improve the poor yield, do away with the flood and alkali of low and stagnant field and perfect the draining and irrigating system.
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