On the basis of established the generalized model, in accordance with the observed data from the reservoirs and silt dams, the sediment volume of small reservoirs and silt dams in Haoshui watershed was estimated using the small reservoir characteristic curve of silt accumulation. The method of generalized deposition was ap-plied to verify the estimated results and to further calculate regional erosion modulus. This approach was simple and the results were proven reliable. This proposed simple sediment estimation algorithm could pro-vide theoretical basis for further research regarding water and sediment in South Ningxia mountainous area.