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经济用水对于稻灌区来说,具有特殊重要的意义。稻灌区用水量较多,在我国北方地区一个百万亩规模的灌区,年用水量可达15～20亿米~3。近年来,由于世界性的气象条件变化,许多地方遭受干旱缺水的威胁。例如我国华北、西北、东北部连年遇到不同程度的干旱。辽河流域已建有六座大型水库,具有一定径流调节能力,但由于库区少雨,蓄水达不到设计兴利库容,失去了抗御较大干旱的能力。今后随着四化建设的发展,工
Economic water for rice irrigation area, has a special significance. In the irrigated area, there is a large amount of water consumption. In the irrigated area of one million mu in the northern part of China, annual water consumption can reach 15 to 2 billion meters ~ 3. In recent years, many places have been threatened by drought and water shortage due to the changes of world meteorological conditions. For example, China’s north, northwest and northeast encountered varying degrees of drought in successive years. Liaohe River Basin has built six large reservoirs, with some capacity of runoff regulation, but due to lack of rain in the reservoir area, the storage capacity of less than design and development, lost the ability to resist greater drought. In the future with the development of the four modernizations, workers