一九五三年以来,陕北各地陆续兴建了一批沟壑土坝和小型水库。这些库(坝)拦洪2～3年后,多数坝内已淤满或基本淤满,出现了大片可耕坝地,这类工程统称为大型淤地坝。目前不少大型淤地坝的坝内淤积高度已超出了溢洪道底槛1～3米,防洪能力大大减低,失去了继续拦泥淤地的作用,目前急需巩 Since 1953, a number of gully earth dams and small reservoirs have been built in various places in northern Shaanxi. After 2 to 3 years of flood control of these reservoirs, most of the dams have become full or almost full of silt, and a large amount of arable land has emerged. Such projects are collectively referred to as large-scale warping dams. At present, the siltation height of many large silt dam has exceeded the spillway threshold of 1 to 3 meters, greatly reducing flood control ability, losing the role of silt retention continues