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Title: Impacts
of Seawater Intrusion Around Tidal Link
(NDP Seminar-I, Mehran
University of Engineering and Technology,
Pakistan 2001)
The Tidal Link is a
main component of LBOD (Left Bank Out Fall Drainage) project and it was
constructed to drain out the saline effluent into the Arabian Sea through an
active creek “ Shah Samando Creek” leading to “Seer
Creek” in district Thatta. Unfortunately after the completion of the project it
has negative impact on environment. The coastal district Thatta and Badin,
already under the danger of seawater intrusion, more over due to the failure of
Tidal link the outfall drains of Karo-Gungro
and Fulleli- Guni, and
Ahmed Rajo Branch drain of Kotri
Barrage Surface Drainage Schemes and a number of small depression and water
bodies of Tidal project area are under the influence of backwater from Tidal
Channel. This paper highlighted the level of seawater intrusion and its
Environmental impact, by using GIS software “Arc View” and aerial photography
of 1954 and 1975 and satellite imageries of 1973, 1977, 1989, 1991 (all pre
construction), 1994 (during construction), and 1997, 2001 (post construction). These images show the
general layout of Tidal Link and the associated water bodies. The GIS analysis
show that the areas of agriculture that occur to the north and east of the water
bodies that was historic flood plane have been badly affected by the seawater
flooding
Complete paper will be provided on request