Waterlogging and salinity management in the Sindh Province. Volume one - Supplement 1-D: Drainage in the LBOD project: impact assessment.
1999
Butt R. | Munir N. | Almas M.I. | Rehman G. | Hamid A. | Soomro T. | Hussain A. | Tabassam M. | Yousaf K.
This study is primarily aimed at a comparative physical evaluation of the irrigated regime in the aftermath of the completion of the largest public sector drainage scheme in the world, the Left Bank Outfall Drain (LBOD) Project in the Lower Indus Basin Plain. In tandem with the construction, operation- and maintenance-related activities of the project, there is a significant mass of investigations pertaining to the collection of both, benchmark and periodic monitoring of the physical and economic data that allow for a progressive evaluation of the tangible, and for the purpose of this study, visible benefits accruing from the project. The premise is that additions to cultivated areas and the suppression of stressed land margins are major indicators of incipient stimuli for progressive improvements being brought about by the drainageworks. These physical changes bear direct relevance to the overall production potential of the land, and hence, for this study, public sector data sets have been identified to allow for a spatial comparison with the emergent situation following the formal completion of the project in December 1997. The scale of the study is specific to the component level stratifications of the LBOD, for which integrated spatial analyses have been made through the use of a geographical information system (GIS). Most recent updates to the physical conditions of the land have been facilitated through IRS-IC images of 1997. The image resolution, at 5.8 meters/pixel, can account for details at the farm level, however, this was beyond the ambit of the study. In the absence of concurrent field surveys, the image interpretations have been facilitated by previous physical monitoring conducted by WAPDA.
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