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Reservoir storage is under half capacity. Reservoirs hold 39% of capacity. 14 of 194 groundwater wards show stressed or critical levels. 65 wards are declining year-over-year. 246 water bodies near degraded rivers are flagged for priority restoration.
Reservoirs: 2026-09-26 | Groundwater: Mar 2024
Most supply reservoir catchments are near normal over 30 days. Poondi catchment is 35% below its 30-day norm.
Catchment rainfall through 31 Aug 2026 (30-day window). Catchment boundaries are provisional, pending verification.
Treated-water reuse + micro-irrigation can cut unmet demand 52-93% by 2050.
Risk index & scores: TNGCC and CEEW 2026, "Towards Climate-resilient River Systems in Chennai" (CC BY-NC 4.0).
CGWB block exploitation, ward depth (interpolated), ward risk composite, live WRIS station overlay.
mapped water bodies, encroachment census, restoration priority badges, ward search, lost-tank inventory.
Methodology, data sources, water sources tracked, and the data gaps we're honest about.
Methodology: Reservoir levels for Chennai from CMWSSB. Daily consumption assumptions (~830 MLD demand) are starting points; the sliders above let you substitute your own. See theAbout pagefor the full data-source index and methodology.