Check dam near Tekadi
cd-2 · 20.7353, 79.5276 · Pauni taluka · PIN 441910
Contributing catchment 102.49 km² · at a 3 m bund it impounds 235 thousand m³ over 24 ha · design monsoon yield 38,045 thousand m³ · soil HSG-D (clay 44%).
In plain words
The one new-build in the shortlist — a check-dam site on a nala near Tekadi (Pauni) with a very large upstream catchment. The nala carries only a thin thread of water today, but that big catchment means real monsoon flow passing straight through.
What to build
Build a new check dam / nala bund across the reach.
Why here
There is no structure here yet, but the catchment delivers substantial monsoon runoff that is currently lost downstream. The valley is gentle and the soil is heavy clay — conditions that favour holding water on the surface rather than losing it.
How
Construct a check dam / nala bund with a proper waste weir, designed for surface storage and downstream protective irrigation. Verify the pour point and foundations on the ground, along with the built-up change seen in the wider vicinity.
The delta — now vs after
From a nala that carries its monsoon flow away to a bund that holds a season’s water for Tekadi — new storage, irrigation and drinking supply where there is none today.
What it delivers · indicative
Indicative benefit at a 3 m bund (DEM area-capacity at 3 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
≈ 235 thousand m³ of net-new water · 47 ha irrigable · 4,273 drinking person-years.
full design storage — no structure holds water here today.
Why this site
Sited on an order-4 nala with a 102.5 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, 39 scenes). Radar peak vs summer low: 4.4 → 0 ha, a 4.4 ha annual draw-down — the storage renovation recovers.
Area-capacity (DEM, 30 m) · gross storage by bund height
Cross-witness & confidence — independent corroboration
Two sensors track together
Optical (S2) and radar (S1) rise and fall together with correlation r = 0.29 across 39 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 6,252 m away.
Land acquisition (submergence)
A 3 m bund would submerge 24 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
No structures in footprintIn the submergence footprint
0
buildings within the 275 m design-submergence radius (24 ha pond at 3 m).
Nearest structure
372 m
to the closest mapped building.
Within 500 m
3
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
Tekadi
1,060 m away · Pauni taluka · PIN 441910
Nearest landmark
Z.P. School Tekadi
Schools within 2 km
0
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
+0.036
109 ha lost · 272 ha gained over 1,869 ha land
Built-up (NDBI) change
98.7 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.