Tank renovation near Kholapur
tank-12 · 21.0462, 79.6407 · Bhandara taluka · PIN 441924
Contributing catchment 31.8 km² · soil HSG-D (clay 42%).
In plain words
A tank near Kholapur (Bhandara) that both sensors track well, filling strongly each monsoon and drawing down to nothing by summer. Its footprint is clear of settlement.
What to build
Renovate — desilt and strengthen.
Why here
Consistent monsoon fill but no dry-season carry-over — depth lost to siltation.
How
Desilt, strengthen the bund and weir, and clear the feeders.
The delta — now vs after
From a seasonal pond to a dependable dry-season store for Kholapur.
What it delivers · indicative
Live capacity from the observed satellite extent (154 ha) x 1.5 m mean depth. Desilting restores the depth lost to siltation — the tank empties to near-nothing by summer today, so recovered depth means water held later and more recharge. Irrigation ~5 TCM/ha; drinking 150 lpcd. Actual yield varies with monsoon reliability, seepage and siltation.
Incremental over today · the net-new gain, from the 4-year record
≈ 2,152 thousand m³ of net-new water · 430 ha irrigable · 39,127 drinking person-years.
recovered draw-down (143 ha of 143 ha peak) x 1.5 m — the water it loses to summer today.
Why this site
An existing water body — desilting and strengthening recovers lost storage at a fraction of new-build cost.
Seasonal water extent · dual-sensor
Radar (S1, 48 passes) fills the monsoon gap that cloud hides from optical (S2, 38 scenes). Radar peak vs summer low: 123.8 → 16.3 ha, a 107.5 ha annual draw-down — the storage renovation recovers.
Cross-witness & confidence — independent corroboration
Two sensors track together
Optical (S2) and radar (S1) rise and fall together with correlation r = 0.72 across 38 paired months. Absolute extents match 78% — a close magnitude match strengthens the read on an open water body.
Independent inventory (HydroLAKES)
No HydroLAKES polygon within 800 m (nearest 6,551 m) — likely seasonal water not in the global inventory; treat as unconfirmed.
Land acquisition (submergence)
Submergence not computed for this structure type.
Displacement witness — real building footprints
No structures in footprintIn the submergence footprint
0
a renovation floods no new land — desilting restores depth within the existing waterspread, so nothing is displaced.
Nearest structure
501 m
to the closest mapped building.
Within 500 m
0
buildings in the influence ring.
Restoring lost depth within the existing waterspread raises no new water level and acquires no new land, so no one is displaced. Verify bed encroachment on the historical spread on the ground before restoring the full level.
Overture Maps buildings 2026-05-20.0 (union of OSM / Google Open Buildings / Microsoft / Esri), Bhandara admin_code=506. A desktop displacement screen — precedes, not replaces, cadastral (7/12) verification.
Reconnaissance context & access — Ola + Google Places
Nearest habitation
Kholapur
525 m away · Bhandara taluka · PIN 441924
Nearest landmark
Zilla Parishad Primary School Jakh Kh
Schools within 2 km
2
nearest 1,236 m
Health within 2 km
0
Google Places (New) searchNearby + Ola Maps Places nearbysearch · reconnaissance-grade. Independent witness to the buildings displacement layer — dense amenities near a site corroborate high displacement. Does not replace cadastral 7/12 records, geotechnical bores or a level survey.
Human pressure — land-cover change (2022 → 2026)
Stable land coverVegetation (NDVI) change
+0.039
46 ha lost · 140 ha gained over 1,665 ha land
Built-up (NDBI) change
17.3 ha
new built-up / bare (construction proxy)
Window
2022-11..2023-02 (8 scenes)
→ 2025-11..2026-02 (8 scenes)
Sentinel-2 L2A dry-season MEDIAN composites (2022-23 vs 2025-26), water-masked; NDVI+NDBI change screen — not cadastral or DEM cut/fill
DPR-grade desktop hydrology from Copernicus GLO-30 (30 m) + ISRIC SoilGrids + ESA WorldCover; water extent from Sentinel-2 L2A MNDWI (optical) and Sentinel-1 GRD VV radiometrically calibrated to σ⁰ (DN²/sigmaNought² from the product calibration LUT, GCP thin-plate-spline geocoded, open water at σ⁰ < −17 dB; thermal-noise floor not subtracted). A desktop assessment that precedes — not replaces — the statutory ground & geotechnical survey.