Tank renovation near Jamni
tank-7 · 21.2035, 79.6731 · PIN 441904
Contributing catchment 756.6 km² · soil HSG-D (clay 44%).
In plain words
A tank near Jamni that both sensors watch fill each monsoon (radar to ~116 ha) and draw down by summer. As a renovation it displaces no one, though the nearest building is close (~42 m). It is low-confidence on corroboration: weak sensor tracking (correlation 0.51), a poor magnitude match, and no inventory lake within range.
What to build
Ground-truth the tank; if it is a real, renovable water body, desilt and strengthen.
Why here
A strong seasonal swing and no new land to acquire, held back only by cross-sensor and inventory corroboration.
How
A field visit to confirm the tank and its bund; then renovate if confirmed.
The delta — now vs after
Confirmed, a sizeable no-displacement renovation (~1,700 thousand m³) for Jamni; the blocker is corroboration.
What it delivers · indicative
Live capacity from the observed satellite extent (116 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
≈ 1,213 thousand m³ of net-new water · 243 ha irrigable · 22,055 drinking person-years.
recovered draw-down (81 ha of 102 ha peak) x 1.5 m — the water it loses to summer today. The site already carries ≈320 thousand m³ into summer today — that is not counted; only the recovered draw-down is new.
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: 102.2 → 21.3 ha, a 80.9 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 = 0.51 across 38 paired months. Absolute extents match 33% — a close magnitude match strengthens the read on an open water body.
Independent inventory (HydroLAKES)
No HydroLAKES polygon within 800 m (nearest 4,439 m) — likely seasonal water not in the global inventory; treat as unconfirmed.
Land acquisition (submergence)
Submergence not computed for this structure type.
Low confidence — sensors disagree and no independent lake confirms this site. It must be ground-truthed before any commitment of funds.
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
42 m
to the closest mapped building.
Within 500 m
52
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
Jamni
932 m away · PIN 441904
Nearest landmark
New Takali BhagatSingh Ward Bhandara
Schools within 2 km
4
nearest 796 m
Health within 2 km
3
nearest 392 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
+0.04
96 ha lost · 235 ha gained over 1,569 ha land
Built-up (NDBI) change
59.4 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.