Table 2 Past literature on the evaluation indicators used to identify GWPZs. Indicators include elevation (EL), slope (SL), topographic wetness index (TWI), geomorphology (GE), rainfall (R), drainage density (DD), distance to rivers (DR), lithology (LI), fault density (FD), distance to faults (DF), soil (SO), land use (LU), vegetation cover (VC), and water table depth (WT). High (H), medium (M), and low (L) denote their frequency of use and influence level derived from the literature review.
Literature | EL | SL | TWI | GE | R | DD | DR | LI | FD | DF | SO | LU | VC | WT |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Burayu et al.43 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||||||
Mohammed et al.44 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||||||||
Pitchaimani et al.45 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | |||||
Sadeghi et al.24 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||||
Tasci et al.46 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||||||
Chavda et al.47 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||||
El-Sorogy et al.48 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||||||||
Osumeje et al.49 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||||||||
Gebeyehu et al.3 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | |||||
Morgan et al.23 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | |||
Bhadran et al.50 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||||||||
Abdo et al.51 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | |||||
Ogungbade et al.52 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||||||
Rather et al.53 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | |||||||
Allafta et al.54 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | |||||
Dar et al.55 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||||||
Doke et al.56 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | |||||
Halder et al.57 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ||||||
Shao et al.27 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | |||||||
Arabameri et al.30 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | |||
Used frequency | L | H | L | M | H | H | M | H | H | L | H | H | L | L |
Influence level | L | H | M | M | M | M | M | H | M | M | M | L | L | M |
