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小流域既是天然集水单元,又是水土流失综合治理单元和经济开发单元,是指以分水岭和出口断面为界形成的地面水天然汇集的区域面积比较小的闭合集水区。根据浙江省现阶段农村的生产力发展水平,社会经济情况、流域内降水强度及水利工程现状,将流域面积20～100km2的地面水自然汇集区域称之为小流域。小流域综合治理是指以小流域为单元,在全面规划的基础上,预防、治理和开发相结合,合理安排农、林、牧等各业用地,因地制宜,因害设防,优化配置工程、生物和农业耕作等各项措施,形成有效的水土流失综合防护体系,保护、改良和合理利用水土资源,实现生态效益、经济效益和社会效益协调统一,达到山水田林路统一布局,农林牧副渔全面开发的目的。
Small watershed is not only a natural water catchment unit, but also an integrated control unit of water and soil loss and an economic development unit. It refers to a closed catchment area with a relatively small area naturally collected by surface water formed by the watershed and the exit section. According to the development level of rural productive forces in Zhejiang Province, socio-economic conditions, rainfall intensity in the watershed and the current status of water conservancy projects in Zhejiang province, the natural catchment area of surface water with a drainage area of 20-100 km2 is called a small watershed. Comprehensive management of small watershed refers to the small watershed as a unit, on the basis of comprehensive planning, prevention, management and development of the combination of reasonable arrangements for agriculture, forestry, animal husbandry and other industries, according to local conditions, due to damage, optimal allocation of engineering, biological And agricultural cultivation and other measures to form an effective system of comprehensive protection of soil and water loss, protect, improve and make rational use of water and soil resources, achieve ecological and economic benefits and social benefits in a unified manner and achieve the unified layout of mountain and forest road, The purpose of development.