治涝经济效益计算与分析分两个时段进行，1949～1990年及1990～2005年，采用两种不同的方法进行评价。
We compartmentalized two periods to calculate economic benefits and adopted two methods to analyze benefits in 1949~1990 and 1990~2005.
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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