Quality Survey of Marh-Chiniot (M-C) Drain Water Under Seasonal Variations
Limited supply of canal water forces for seeking alternative sources for the supplementation. For this purpose, the quality of Marh-Chiniot (M-C) drain water was tested in different seasons from irrigation/ reclamation point of view. Results indicated that EC of the waters varied in sampling seasons at different sampling points. In general, EC values ranged between 0.25 and 2.69 dSm-1. Its mean values were calculated as 1.08, 1.06, 1.83 and 1.85 dSm-1 during August 1997, December 1997, June 1998 and February 1999 respectively. The mean SAR of these waters was found below the safe limit of 10 (m.mol L-1) ½ with only one exception for June 1998 when it was having this parameter in marginal range. Respective mean values of SAR for the above months were 8.26, 5.42, 11.79 and 9.5 (m.mol L-1) ½. Values of RSC were found generally high with its computed means of 4.71, 4.13, 7.98 and 6.31 me. L-1 for August, December 1997, June 1998 and February 1999 respectively. The quality of waters varied from upstream to downstream, without a definite trend. The seasonal effect was very much pronounced depending upon the flow of water. It may be concluded that this water can be used for crop production and reclamation purposes with some suitable management practices. However, frequent quality assessment will be needed especially, in different seasons.
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