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Detailed Ecological Assessment Report 2008 – Keenjhar Lake Table 27 – Chemical parameter – Post-monsoon S.no Chemical Parameters Post monsoon 1 DO DO varied from 1.2-2.7 ppm 2 Phenols 3.4-15.3 3 Cr 6.4-20.8 ppb 4 Pb 10.93-20.63 ppb 5 Cd 0.61-4.74 ppb 6 Ni 0.93-1.73 ppm 7 BOD 1.00-6.07 ppm 8 COD 5.05-12.13 ppm The value of Ni is higher than Pakistani and WHO Drinking water quality guidelines (0.02 ppm or mg/l). 3.8.3 Drinking water The total dissolved solid, TDS (or conductivity) is a very important parameter along side pH in determining the water quality. The values of both in all samples fall within WHO acceptable range. The TDS below 500mg/l shows that the dissolved solids are on good side considering all of its uses. The turbidity (or TSS) is also within WHO standard of 5 NTU except at locations KL-A6 and A7 (Pre monsoon). These location points are near to K.B feeder. The K.B feeder receives water from Indus River at Kotri Barrage which contains high turbidity. The relatively higher levels were also noted at these locations during 1 st sampling (before monsoon) period. The dissolved oxygen is low (Less than 3.0mg/l); good quality of surface water normally has 9 mg/l of Dissolved Oxygen (depending upon pH and temperature). The depletion of dissolved oxygen is an indicator of organic pollution causing BOD and COD. This was found more so when the water level and flow were low before monsoon period. The Indus water is generally contaminated carrying organic and inorganic pollution load from upstream human activities. The Sindh Environmental Protection Agency (SEPA 2002) reported that the Indus River BOD is over 6.5 mg/l, which according to Global Environmental Monitoring System (GEMS) classification puts this river as “highly polluted”. K.B feeder also carries the municipal effluents of Jamshoro and industrial effluents of Kotri site. The high levels of BOD and COD indicates that sufficient pollution is exerted in before monsoon period through K.B feeder water. The Phenol levels were very high due to use of washing and other Phenol substances by the people. The total hardness, sulphates, chlorides, calcium and magnesium were found in the acceptable range of WHO/other national and international guidelines. Toxic elements detected in the water consisted of chromium which is within the WHO guidelines, Lead levels were found violating WHO standard, but this is not true in before monsoon period. The Nickel levels were also found exceeding the WHO limit. The Cadmium levels, however were high at location Keenjhar Lake A6 and A7, having high turbidity of water entering from K.B Feeder. WWF Pakistan – Indus for All Programme Page 88 of 165
Detailed Ecological Assessment Report 2008 – Keenjhar Lake 3.8.4 Agriculture and livestock The water quality of Keenjhar Lake is very good, considering the TDS (
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Untitled - WWF - Pakistan

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