Reducing the conveyance losses in trapezoidal canals using compacted earth lining

Abstract

Earth canals are subjected to seepage losses during the conveyance and distribution of irrigation water. With the current conditions of climate change and water scarcity, it is becoming crucial to conserve water. Canal lining is a common solution to minimize seepage losses. In this study SEEP/W model is used to investigate the effect of compacted earth lining characteristics on seepage from trapezoidal earth canals. The amount of reduction in seepage due to lining is quantified. Different scenarios for the hydraulic conductivity, thickness, and orientation (position) of compacted earth lining are evaluated. The results show that compacted earth lining is an efficient method to reduce conveyance losses. 99.8% of the water lost by seepage can be saved if highly compacted soil is used on the bed and sides. Partial lining can also be used, the most efficient orientation of lining depends on the canal's width. Design charts and equations are suggested.