TO ASSESS THE IMPACTS OF HYDRAULIC PARAMETERS OF WATER CHANNEL ON PRE AND POST LINING: A CASE STUDY IN FAISALABAD IRRIGATION ZONE

Abstract

Water distribution on earth is not constant in its both forms i.e. surface water and groundwater. In many areas, the groundwater availability is changing, making it less available to agriculture for irrigation purposes. Surface water has fresh quality and frequently used for irrigation practices by diverting water from rivers and stream into canals and watercourses. As this scare and valuable resource move into the irrigation structure, a certain part of that water is lost. The losses in the watercourses are much more than those in the main channels and distributaries. So farmer’s face critical shortage of irrigation water issues. In addition to this groundwater pumping is also increasing that is decreasing groundwater table. The conveyance losses in the watercourses can be minimized by applying some lining techniques. To overcome this problem, there is a need to work out of the channel lining that ensures maximum water saving. A detail study has been carried out in the work to calculate the water losses using operational inflow and outflow approach. The losses from the pre and post lining of the canal have been calculated and assess the impacts of hydraulic parameters of the channel after lining the channel to investigate the hydraulic outlet’s performance, seepage water losses from the channel. In this concern, a case study was conducted on channel lining of Faisalabad irrigation zone. The value of the hydraulic parameters (cross-sectional area, flow velocity, wetted perimeters, hydraulic radius, bed slope, and side slope) for the trapezoidal channel have been investigated in this study. For statistical analysis a generalized linear model (exponential) R-language were used in the study. The value of water losses in pre and post lining of three distributary Lagar Disty, Nasrana Disty and Sehti Wala Minor was 2.238, 1.805, 3.008 m3/s/106m2 and 0.385, 0.486, 0.644 m3/s/106m2 respectively. The lowest losses were found in lined channel of LCC (East) Lagar Disty and the highest losses were found in the LCC (West) of Sehti Wala Minor. In this investigation work, the saving of water through lining the channel is also authentic numerically evaluated and authenticated.