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我国劳动人民用洪用沙历史悠久,但多是利用地形,采取简易形式,短距离输引达到目的。以往,由于对浑水输送理论缺乏研究,多数灌区甚至灌地几十万亩、百万余亩的大型灌区,都是按输送清水的理论规划设计渠道。为了防止泥沙淤渠,陕西省规定河源来水含沙量超过15%(重量比,每立米浑水含沙量166公斤),即关闸停引。因而在伏
The floodwaters used by working people in our country have a long history, but they mostly use the terrain and adopt simple forms and short-distance transports to achieve their goals. In the past, due to the lack of research on the theory of muddy water transmission, most irrigated areas have even infused hundreds of thousands of mu of land and millions of acres of large-scale irrigation areas according to the theoretical planning and design of water conveyance. In order to prevent sediment silt drainage, Shaanxi Province, the provisions of the water content of more than 15% of the river water (weight ratio, muddy water sediment 166 kilograms per cubic meter), that barrier gate stop. So in volts