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石沟水库地处志丹县北洛河支流石家沟河上。1975年12月建成,1976年正式投入运用,是一座发展农田灌溉为主的小(一)型水库。水库由大坝、泄水涵洞和溢洪道三部分组成。均质土坝坝高42米;涵洞最大引水量7.5米~3/秒,溢洪道为开敞式,最大泄洪量300米~3/秒。总库容493万米~3,有效库容270万米~3,死库容22万米~3。设施灌溉面积4000亩,有效灌溉面积3700亩。石沟水库控制流域面积51平方公里,流域全长15公里,原河道比降1/65。全流域属黄土丘陵第五附区,梁峁起伏,沟壑纵横,植被很差,水土流失严重,库形狭窄,河道弯曲,河谷呈 U 字型,非汛期常流量为0.03米~3/秒,年径流量为189万米~3,多年平均降雨量为431.2毫米。年内降雨主要集中在七、八、九月份,且暴雨集中,洪峰陡涨陡落,大量泥沙冲入库内,汛期入库平均
Shigou reservoir is located in Zhidan County, North Luohe tributary of the river ditch. Built in December 1975 and formally put into operation in 1976, it is a small (a) type reservoir that mainly develops farmland irrigation. Reservoir by the dam, drainage culverts and spillway of three parts. Homogeneous earth dam height of 42 meters; culvert maximum water 7.5 meters ~ 3 / s, spillway is open, the maximum discharge of 300 meters ~ 3 / s. The total capacity of 4930000 meters ~ 3, effective storage capacity of 2.7 million meters ~ 3, dead storage 220000 meters ~ 3. Facilities irrigation area 4000 mus, effective irrigation area 3700 mus. Shigou reservoir control basin area of 51 square kilometers, the basin a total length of 15 km, the original river than 1/65. The whole basin belongs to the fifth attached area of Loess Plateau. The undulating beams and ravines are vertical and horizontal. The vegetation is very poor with serious soil erosion. The reservoir shape is narrow and the river is curved. The river valley is U-shaped with a regular flow rate of 0.03m ~ 3 / Annual runoff of 1.89 million meters ~ 3, the average annual rainfall of 431.2 mm. During the year, the rainfall mainly concentrated in July, August and September, and the heavy rain concentrated, the steep rise and fall of the flood peak, a large amount of sediment into the reservoir, the average storage season