Bolgoda Lake twin basin salinity gradient: paddling from North Lake to Panadura outlet?
What are the seasonal tidal lock conditions and bridge clearance heights when sea kayaking across the Bolgoda Lake system through the Diggala narrow strait?
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3 Answers from travellers
The Bolgoda basin is Sri Lanka’s largest natural freshwater-estuarine wetland, divided into North Lake and South Lake connected by the Bolgoda River and Diggala narrows. Paddling from the freshwater North Lake toward the Panadura sea outlet transitions through a pronounced salinity gradient (0.5 PSU to 12 PSU). Kayakers must account for outgoing tidal flow acceleration through the narrow Diggala rail and road bridge arches, where water velocities reach 2.5 knots. Vertical clearance under the low wooden railway trestles drops below 1.1 meters during spring high tides, requiring paddlers to duck across gunwales.
Urban industrial runoff enters near Moratuwa; kayakers should stick to the eastern conservation shoreline where native Annona glabra trees line the banks.
The southern basin houses breeding territories of Mugger Crocodiles (Crocodylus palustris); avoid paddling into dense interior reed grass beds at dusk.
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