Theme 2-2-Unsteady seepage from a canal

Abstract

An analytical solution for unsteady seepage from a canal is derived using Duhamel's principle, the basic solution for water level rise due to steady recharge from a strip source given by Poluborinova - Kochina and the non-linear relationship between influent seepage and hydraulic head difference proposed by Rushton and Redshaw. The parameters appearing in Rushton and Redshaw's proposed non-linear equation for influent seepage have been derived. Variation of seepage with time has been presented in non-dimensional form. Linear relationship for shallow water table condition over estimates seepage from a canal. When water table is at large depth, the linear relationship is not applicable. Seepage losses per unit area is higher for canal with smaller width.