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青县运东灌区的灌溉网,是由4级(干、支、斗、毛)渠道构成的。引水灌渠一条是主干渠;一条是北支干渠,北支干渠也是从主干渠上游引水。1957年这个灌区共改种了8万亩稻田,其中5万亩从主干渠引水,3万亩由北支干渠供水。按照灌溉定额的老规章,需要13秒公方以上的经常水量,才能保证稻田区的不断供水。1957年春旱,水量不足,运东灌区进水涵洞的经常流量仅有4—5秒公方,最
Qingxian Yun irrigation irrigation network, is composed of four (dry, branch, bucket, hair) channels formed. One of the diversion irrigation ditches is the main canal; one is the northern branch and the north branch of the main channel is also from the main canal upstream diversion. In 1957, a total of 80,000 mu of paddy fields were planted in this irrigation district, of which 50,000 mu were used for water diversion from the main canal and 30000 mu were supplied by the Northern Branch Canal. In accordance with the old rules of irrigation quotas, it takes 13 seconds more than the regular water volume in order to ensure continuous water supply in paddy fields. Spring drought in 1957, the lack of water, Yun Dong Irrigation Culvert frequent flows of only 4-5 seconds, the most