Abstract
It's known from previous studies that intake dimensions, such as thickness and width, structural conditions such as projection of piers, and external conditions such as distance from dams are important factors, which affect efficiency of selective withdrawal. The importance of these factors is realized, but the methodologies to evaluate these factors are not established. So even though these factors affect the water quality of dam reservoirs, they are rarely considered in environmental impact analysis. In this paper we will show the information about the efficiency of selective withdrawal, based on field data obtained.
