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园河属清水河支流——西河的上游部分,流域东部是南华山,西侧是西华山和崛蜈山,南接月亮山,北临西安盆地,海拔1,765——2,955米,集流面积929平方公里(其中本区境内626平方公里)。地貌类型以黄土丘陵沟壑区为主,包括部分土石山区。流域内有大小支沟136条。年降雨量360——600毫米之间,年平均降水约400毫米,多年平均径流量1,105万立方米,年输沙量247万吨,年输沙模数每平方公里3,470吨,水土流失比较严重。 园河流域的水土保持工作始于五十年代,开始以小型工程为主。六十年代全国水土保持工
Park River is a tributary of the Qingshui River - the upper reaches of the West River, the basin is the South Huashan in the east, West Huashan hill and rising centimeter, south of the moon mountain, north of Xi’an basin, elevation 1,765 - 2,955 meters, the current area of 929 Sq km (of which 626 sq km in the area). Landform types mainly in loess hilly and gully areas, including part of the mountainous areas. The size of the valley basin 136. Annual rainfall of 360 - 600 mm, the average annual rainfall of about 400 mm, the average annual runoff of 11.05 million cubic meters, the annual sediment transport 2.47 million tons, the annual sediment transport modulus of 3,470 tons per square kilometer, soil erosion is more serious . The work of soil and water conservation in Yuanhe River Basin started in the 1950s and started mainly with small-scale projects. Sixty national soil and water conservation workers