Water Body Remediation in Kalwa, Thane.

Kalwa's water bodies are its nalas more than its lakes. Streams that once carried monsoon water off the Parsik slopes now run through dense housing as open drains, carrying sewage and waste to the creek. Remediation starts where the nala meets the mangroves: screens to hold back solids, interception of dry-weather sewage for treatment, and planted banks where there is room. Upstream, it means desilting before the rains and keeping the channel's width from being built into. The families along the banks gain first.

Kalwa lies across the creek from central Thane, joined to it by the Kalwa bridges and the railway. It is one of TMC's ward committees, and it is densely lived in: older buildings near the station, chawls, and large settlements climbing the lower slopes of the Parsik hills, with newer buildings on flatter ground. The creek edge on its western side is lined with mangroves, and nalas from the hill run down through the settlements into it. Thane-Belapur Road begins at its southern end. Open ground is scarce, and much of what exists is unplanned.