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一、概况利根川水系是日本流域面积最大的水系,发源于群马县利根郡丹后山,流经关东地区一都五县,在千叶县铫子市流入太平洋,长332公里,流域面积15832平方公里。灌溉面积21.5万公顷,洪泛区面积约32.14万公顷,1947年全流域平均降雨量318毫米,9月15日八斗岛的洪峰流量26500立方米/秒。 1961年日本在前桥市建立了利根川水库统一管理事务所,统一调度位于八斗岛以上的水库群,控制流域面积5114平方公里,约占利根川流域面积的1/3。
I. Introduction The Tangengchuan water system is the largest water system in the Japanese basin. It originates from Mt. Dan Hou Mountain, Tangeng County, Gunma County. It flows through one of the five prefectures in the Kanto region and flows into the Pacific Ocean in Choshi, Chiba Prefecture, 332 km long. Its drainage area is 15832 Sq km. Irrigated area of 215,000 hectares, flooded area of about 321,400 hectares, the average rainfall in the entire basin in 1947 318 millimeters, September 15 Hatta Island peak flow of 26,500 cubic meters / second. In 1961, Japan established the Leeg Chuan Reservoir Uniform Management Office in Maebashi City and unified the dispatching of reservoirs located above Batu Dao Island. The control basin covers an area of 5,114 square kilometers, accounting for about one-third of the area of the Leegeon River Basin.