The document analyzes variation in physiochemical parameters along part of the Dutch Canal in Sri Lanka which receives effluent from shrimp farms. Water samples from five sites showed higher levels of chlorophyll a, turbidity, pH, ammonia, phosphate and biological oxygen demand at certain sites indicating impact from farming activities. The study concludes the receiving water quality is negatively impacted especially around Udappuwa, Madurankuliya and Muthupanthiya and recommends complementary treatment systems and awareness programs for resource users.
1. Variation of some physiochemical parameters along a part of the Dutch cannel in North Western Province of Sri Lanka P.V.S.L. Gunawardena U.P.K. Epa M. Hettiarachchi University of Kelaniya
2.
3.
4.
5.
6.
7.
8.
9.
10. Variation of temperature in top water levels Temperature o C Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
11. Variation of Dissolved Oxygen in top water DO level (mg/l) Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
12. Variation of pH in top water levels pH Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
13. Variation of Chemical and biological factors Parameter Karukkupane Nalladarankattuwa Muthupanthiya Udappuwa madurankuliya PO 4 -3 0.046 mg/l ± 0.025 0.047mg/l ± 0.021 0.018mg/l ± 0.007 0.104mg/l ± 0.261 0.030mg/l ± 0.048 [NH 3 ] 0.120 mg/l ± 0.087 0.041 mg/l ± 0.020 0.076 mg/l ± 0.039 0.215 mg/l ± 0.096 0.226 mg/l ± 0.097 [Chlorophyll a] 24.00 mgm -3 6.63 a 12.76mgm -3 5.26 b 20.55mgm -3 4.21 b 29.56 mgm -3 7.74 a 32.85 mgm -3 18.27 c Average value ± std. error
14. Variation of Chlorophyll a concentration Chlorophyll a level ( mgm -3 ) Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
![Introduction ,[object Object],[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)