Impact of remodeling and rehabilitation of irrigation outlets on water distribution of a canal in Punjab, Pakistan
2009
Bodla, H. (University of Engineering and Technology, Lahore (Pakistan). Centre of Excellence in Water Resources Engineering) | Latif, M. (University of Engineering and Technology, Lahore (Pakistan). Centre of Excellence in Water Resources Engineering)
The study was undertaken to investigate water distribution along a distributary canal located in the southern part of the Punjab Province. It is a large size distributary having 353 cusecs of authorized discharge. This distributary was subjected to a series of problems including but not limited to (i) withdrawal of water by illegal means, (ii) design and construction flaws in the outlets, (iii) improper selection of the type of outlets and many others. The outlets were intentionally designed wrongly by using fictitious hydraulics data to provide undue benefits to the irrigators. During construction, setting of the outlets was also intentionally fixed at lower level than the designed. Investigations were carried out to evaluate hydraulic performance of all the outlets of the channel. Based on the observed data, capacity statements of all the outlets were revised. The outlets were redesigned on the basis of actual hydraulic data of each outlet. Most of the non-modular outlets (Pipe and Scratchily) were converted to semi-modular outlets (OFRB and APM). WA implementation of new and modified design of the outlets at the site, equity of water distribution has been improved. The results revealed that design of the outlets had a significant impact on equitable distribution of water along the distributary.
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