Experimental Study on the Effect of Rationing System on the Infiltration Rate of Cement-Treated Gypseous Canals
Keywords:
Rationing System, Infiltration Rate, Wetting and Drying, Gypseous Soil, Irrigation Channels.Abstract
Water scarcity in irrigation canals requires specific procedures to be taken by the Ministry of Water Resources. One of these procedures is the application of the rationing system in the irrigation channels. The study of the irrigation canals is important in both water resources engineering and civil engineering, especially if those canals are built on gypsum soil. In order to evaluate the rationing system in gypsum channel treated with a certain percentage of cement, practical experiments were conducted to discover the effect of wetting and drying cycles on the physical and hydraulic behavior of this soil and to calculate some soil properties such as infiltration rate and moisture content in each cycle (10 wetting days and 10 drying days). Gypseous soil containing 65% gypsum was uesed in this study. The infiltration box model that was built for this research contains four samples and two samples of untreated soil (8 rationing cycles), one of which was exposed to the rationing system, while the other two samples were mixed with soil mixed with 10% cement (5 cm of cement mixture over 15 cm soil) 8 cycles as well, and one of them was exposed to the rationing system. This paper shows that the treating by cement reduces the infiltration rate about 88%. The application of the rationing reduces the infiltration rate about 77% for treated soils, and in the case of untreated soils, the infiltration rate increases by 20%. In the absence of a rationing system, the results are quite reversed.
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