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Interceptor drains along irrigation canals.

Author(s)
M. N. Bhutta International Waterlogging and Salinity Research Institute (IWASRI) Lahore, Pakistan
A. B. Sufi International Waterlogging and Salinity Research Institute (IWASRI) Lahore, Pakistan
Nazir Ahmed International Waterlogging and Salinity Research Institute (IWASRI) Lahore, Pakistan
Abstract
Interceptor Drains were installed along three Canals of Fordwah Eastern Sadiqia (South) Irrigation and Drainage Project. Ground watertable behaviour was observed before and after the installation of interceptor drains. Seepage rate of the canals was measured through ponding test method. The lithology of the area along the trial sites didn`t allow the interceptor drains to receive the expected design discharge. Measured seepage from the canals was much lower than originally envisaged at the time of design of interceptor drains. The measured discharge of interceptor drains was 31%, 47% and 82% of the design discharge at Malik Branch, Hakra Branch and 3-R Khatan Distributary respectively. The quality of the drained water was not too bad for reuse for irrigation after mixing with canal water. The interceptor drains could not significantly reduce the need of field drainage. Based on the results of trials conducted by IWASRI, main interceptor drain component of 280 km was dropped from the project. In this way, the results of the study have helped save unnecessary expenditure of approximately US $ 20 million (over Rs. 1000 million) allocated for installing interceptor drains in FESS Project. Moreover an additional amount of Rs. 25 million to be incurred annually for operation and maintenance has also been saved. Interceptor drains cannot be recommended as recharge reducing technology in flat areas without proper investigations and testing.
Publication Details
Page(s) 45-52
DOI DOI not available
Published Journal: Journal of Engineering and Applied Sciences, Volume: 24, Issue: 1, Year: 2005

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