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.