Muthurajawela marsh tidal flushing: industrial effluent buffers and kayak route safety?
What are the dissolved oxygen levels and industrial effluent exclusion corridors along the southern Hamilton Canal for sea kayakers departing Hendala at 11:30 AM?
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3 Answers from travellers
Paddling the southern sector of Muthurajawela Marsh via the Hamilton Canal requires tracking municipal water exchange. The southern approach near the Dandugam Oya canal convergence receives treated industrial discharge from nearby industrial zones, causing dissolved oxygen to drop below 3.0 mg/L around mid-day slack water. Kayakers should paddle on outgoing ocean tides when water flushes north toward Negombo estuary. Stick to the designated western biological buffer channels lined with Acrostichum aureum (mangrove fern) and Nypa fruticans palms where natural bio-filtration maintains clean water flow.
Rinse skin and paddle gear thoroughly with fresh chlorinated water after trips; stagnant wetland drainage carries elevated microbial coliform counts.
The wetland serves as a crucial urban sanctuary for smooth-coated otters (Lutrogale perspicillata); avoid paddling through narrow reed nesting culverts.
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