Check dam near Panjarepar
cd-12 · 20.7316, 79.5424 · Pauni taluka · PIN 441910
Contributing catchment 47.94 km² · at a 2 m bund it impounds 143 thousand m³ over 25 ha · design monsoon yield 27,884 thousand m³ · soil HSG-D (clay 44%).
In plain words
A check-dam site near Panjarepar (Pauni) on a 48 km² catchment. The nala runs thin — both sensors see only 1–2 ha — so the case rests on the catchment’s runoff, not a standing pool. Sized to a 2 m bund to stay clear of settlement; six buildings fall within that footprint, the nearest ~160 m off.
What to build
Survey the six structures and the pour point; build a 2 m bund if they clear.
Why here
A large catchment fills the 2 m pond many times over, so the harvest is real; the six structures and the thin flow signal are what a ground visit must settle.
How
Cadastral + ground check of the six structures; confirm the pour point and that monsoon flow matches the catchment.
The delta — now vs after
~140 thousand m³ of new storage for Panjarepar at a settlement-clearing height; drop if the land or flow will not confirm.
What it delivers · indicative
Indicative benefit at a 2 m bund (DEM area-capacity at 2 m bund) under standard norms (irrigation ~5 TCM/ha; drinking 150 lpcd). Recharge is limited on HSG-D clay (12% of storage). Actual yield varies with monsoon reliability, seepage and siltation.
Incremental over today · the net-new gain, from the 4-year record
≈ 143 thousand m³ of net-new water · 29 ha irrigable · 2,600 drinking person-years.
full design storage — no structure holds water here today.
Why this site
Sited on an order-4 nala with a 47.9 km² contributing catchment and gentle grade — a nala/check dam impounds monsoon runoff on the clay lowlands where infiltration is low.
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: 1.3 → 0 ha, a 1.3 ha annual draw-down — the storage renovation recovers.
Area-capacity (DEM, 30 m) · gross storage by bund height
Design point stepped down to 2 m: a full 3 m bund here would flood settlement, so the site is sized to the largest height that clears it while the catchment still fills the pond.
Cross-witness & confidence — independent corroboration
Two sensors track together
Optical (S2) and radar (S1) rise and fall together with correlation r = -0.11 across 38 paired months. Absolute extents match 0% — they differ by sensor physics on a flowing nala, so the shared rhythm is the witness, not the magnitude.
Nala flow (new-build site)
No existing lake here — expected for a new structure. Sensors confirm a monsoon flow pulse in the nala; nearest mapped lake is 5,102 m away.
Land acquisition (submergence)
A 3 m bund would submerge 86 ha — the land to be acquired. Cost & consent scale with this.
⚠ catchment likely includes a through-flowing nala — verify pour point
Displacement witness — real building footprints
Several structures — survey neededIn the submergence footprint
6
buildings within the 279 m design-submergence radius (25 ha pond at 2 m).
Nearest structure
162 m
to the closest mapped building.
Within 500 m
20
buildings in the influence ring.
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
Panjarepar
1,191 m away · Pauni taluka · PIN 441910
Nearest landmark
Nilaj Phata
Schools within 2 km
1
nearest 1,513 m
Health within 2 km
1
nearest 1,394 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
89 ha lost · 275 ha gained over 1,869 ha land
Built-up (NDBI) change
75 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.