During intense Southwest and Northeast monsoons, soil saturation causes unsealed concrete pits to fill with groundwater and, in severe cases, back up into ground-floor toilets and drains. Parawewa's sealed concrete construction is engineered to keep external groundwater out of the treatment chamber, helping multi-unit residential sites stay sanitary through flood-prone periods.
Monsoon floods in Sri Lanka's Western and Southern provinces regularly inundate low-lying residential areas, and conventional drainage infrastructure is not always able to keep pace. For a household relying on a traditional septic pit, this is more than an inconvenience — a saturated pit that can no longer accept new inflow will back up through the path of least resistance, which is often the lowest bathroom drain in the house.
Why Multi-Unit Sites Feel It More
Apartment complexes and housing schemes concentrate far more daily wastewater output onto a smaller footprint than a single house, so when a shared septic system is compromised during flooding, more households are affected simultaneously.
An apartment installation in Kohuwala and a housing complex in Kesbewa represent exactly this multi-unit category — sites where a single shared sewage system needs to stay reliable for many households at once, particularly through the Western Province's heaviest rainfall months.
Flood-Resilience Features to Ask About
- Sealed, jointless chamber construction that resists inward groundwater seepage during saturation
- Anti-buoyancy anchoring so the tank cannot shift or float when surrounding soil becomes fully waterlogged
- Option B (Seal Type Parawewa System) discharge for sites where gravity outflow is unreliable during peak flood levels
- A 10-Year written warranty that covers structural integrity through repeated monsoon cycles, not just initial installation
For any property in a known flood-prone corridor, a pre-monsoon site inspection is worth scheduling well before the rains arrive — retrofitting or upgrading a failing system is considerably more disruptive once flooding has already begun.
