Tank renovation near Gadkumbhali
tank-9 · 21.0500, 80.0021 · Sakoli taluka · PIN 441802
Contributing catchment 657.5 km² · soil HSG-C (clay 40%).
In plain words
A tank near Gadkumbhali (Sakoli) that both sensors watch fill each monsoon and empty by summer. They track the seasonal rhythm together (correlation 0.62) but differ on extent — optical reads about 98 ha at peak, radar about 37 ha — so the fill is certain and repeatable while its exact size is less so. The footprint is clear of settlement.
What to build
Renovate — desilt and strengthen.
Why here
It reliably catches monsoon water but cannot hold it — the classic silted-tank pattern.
How
Desilt to restore depth, strengthen the bund and outlet, and clear the feeder channels.
The delta — now vs after
From monsoon-only to a tank that carries water and recharge into the dry season for Gadkumbhali.
What it delivers · indicative
Live capacity from the observed satellite extent (98 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
≈ 804 thousand m³ of net-new water · 161 ha irrigable · 14,618 drinking person-years.
recovered draw-down (54 ha of 54 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: 32.4 → 7.2 ha, a 25.2 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 = 0.62 across 38 paired months. Absolute extents match 45% — a close magnitude match strengthens the read on an open water body.
Independent inventory (HydroLAKES)
No HydroLAKES polygon within 800 m (nearest 1,398 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
221 m
to the closest mapped building.
Within 500 m
3
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
Gadkumbhali
1,620 m away · Sakoli taluka · PIN 441802
Nearest landmark
Aasha Kiran Palace
Schools within 2 km
4
nearest 1,814 m
Health within 2 km
2
nearest 753 m
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
+0.041
46 ha lost · 119 ha gained over 1,768 ha land
Built-up (NDBI) change
27.8 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.