Study on the mechanism of Pollutant transmission in the river is a major part of the knowledge of environmental engineering. If the pollution transmission mechanisms in the river with various geometries were specified, the river water quality managing does by more accuracy and his leads to reduce the effects of river pollution on public human's health. In this paper, the pollution longitudinal dispersion coefficient (LDC) is calculated by dispersion routing method for Severn River. To calculate

more »

... the LDC the concentration profile data published by Atkinson and Davis is used. They considered seven stations along the river for measuring and record the concentration profile at each station. The minimum value of LDC is 12.5 21 ms  and maximum value dispersion coefficient is 41.5. 21 ms  . For calculating the LDC by empirical formulas, 12 of the famous equations related to the dispersion coefficient is collected and assessing them to calculate the LDC for Severn River shows that the Tavakollizadeh and Kashefipour equation by correlation coefficient about 0.4 is the most accurate empirical formula.