Table 4.
Detailed thematic layer statistics, classification ranges, dominant influence classes, and ANN-derived contribution weights for GWPZ mapping.
| S. no. | Thematic layer | Contribution weight (%) | Number of classes | Class details (retained from original) | Dominant influence class (as per ANN) | Influence type | Description of impact on GWPZs |
|---|---|---|---|---|---|---|---|
| 1 | Geology | 9 | 17 | Acidic Bodies, Basic Sills/Dykes, Benpal Gp, Champaner, Coastal Sediments, Debari, Deccan Traps, Godhra Granite, Hindoli Gp, etc. | Deccan Traps | Direct | Lithological structure controls aquifer potential and permeability |
| 2 | GM | 12 | 13 | Alluvial Plain, Coastal Plain, Dam/Reservoir, Flood Plain, Dissected Hills/Valleys, Plateau, Pediment, Quarry, Waterbody types | Alluvial Plain | Direct | Controls infiltration, storage, and recharge potential |
| 3 | Lineament Density | 14 | 5 |
0–0.15, 0.15–0.36, 0.36–0.57, 0.57–0.94, 0.94–1.78 |
0.94–1.78 (Very Fine) | Direct | Enhances secondary porosity and permeability |
| 4 | Drainage Density | 12 | 5 |
0–1.02, 1.02–1.41, 1.41–1.75, 1.75–2.15, 2.15–3.26 |
0–1.02 (Very Coarse) | Indirect | Low drainage favors infiltration and reduces surface runoff |
| 5 | NDVI | 7 | 5 | −0.127–0.085, 0.085–0.125, 0.125–0.171, 0.171–0.255, 0.255–0.498 | 0.255–0.498 | Supporting | Higher NDVI indicates healthy vegetation and potential recharge areas. |
| 6 | SAVI | 8 | 5 | −0.191–0.128, 0.128–0.187, 0.187–0.257, 0.257–0.383, 0.383–0.748 | 0.383–0.748 | Supporting | Indicates vegetation condition influencing recharge indirectly |
| 7 | NDWI | 6 | 6 | −0.472–0.254, −0.254–0.197, −0.197–0.157, −0.157–0.074, −0.074–0.213, 0.101–0.420 | 0.101–0.420 | Supporting | Moisture presence reflects surface wetness, aiding recharge. |
| 8 | TGSI | 5 | 5 | −0.132–0.047, 0.047–0.073, 0.073–0.088, 0.088–0.101, 0.101–0.420 | 0.101–0.420 | Supporting | Surface greenness suggests favorable surface infiltration conditions. |
| 9 | Slope | 11 | 5 |
0–2%, 2–5%, 5–15%, 15–35%, > 35% |
0–2% (Very gently sloping) | Indirect | Gentle slopes promote percolation and reduce erosion |
| 10 | Land use/land cover (LULC) | 10 | 6 | Waterbody, dense vegetation, vegetation, fallow land, barren land, scrub | Vegetation | Supporting | Influences infiltration based on surface cover type |