Abstract

 Along the major canals in Nawabshah & Sanghar District of Pakistan there are extensive areas, where a layer of fresh ground water over lies the deeper saline water. Extraction of this water by skimming wells has polluted the ground water by up-coning after approximately 03 years (WAPDA 84).
  Scavenger wells are effective in controlling this problem. It extracts fresh and saline water at same time through duel pumping, which prevents up coning. Results show that fresh water quality of most scavenger wells is in average category against United States Department of Agriculture Irrigation Water quality standards (0.251-0.750 dS/m).
  Fresh water drawn from all scavenger wells is generally used for Irrigation and there is no awareness or willingness to use it for domestic or aquatic purposes. Water from most scavenger wells are within limits for drinkable levels of TDS, pH, Chloride, Sulphide based on WHO quality standard for drinking water (1988).