Table 4 Area of each variable.
From: Assessing groundwater vulnerability in the intermountain plains of Metro Hilir watershed Malang
Parameter | Rating | Range | Area (Ha) | % |
|---|---|---|---|---|
D—depth to watertable (m) | 9 | 1.5–3 | 332.765 | 4 |
8 | 3–4.5 | 2374.1 | 31 | |
7 | 4.5–9 | 2729.907 | 36 | |
5 | 9–15 | 2193.89 | 29 | |
R—net recharge (mm) | 9 | > 250 | 7633.60 | 100 |
A—aquifer media | 9 | Basalt | 95.51 | 1 |
8 | Sand and Gravel | 3279.44 | 43 | |
3 | Metamorphic/Igneous | 4253.96 | 56 | |
S—soil media | 1 | Non-Aggregate Clay | 6417.052 | 84 |
3 | Clay Loam | 1216.313 | 16 | |
T—topography (slope %) | 10 | 0–2 | 22.50 | 0.2 |
9 | 2–3 | 188.51 | 2.5 | |
8 | 3–4 | 478.52 | 6.3 | |
7 | 4–5 | 727.79 | 9.5 | |
6 | 5–6 | 785.79 | 10.3 | |
5 | 6–10 | 2515.39 | 33 | |
4 | 10–12 | 762.29 | 10 | |
3 | 12–16 | 936.05 | 12.3 | |
2 | 16–18 | 275.52 | 3.6 | |
1 | > 18 | 938.81 | 12.3 | |
C—hydraulic conductivity (m/day) | 10 | > 6.5e − 4 | 4257.339 | 55.76 |
6 | 33e − 5 − 5e − 4 | 1029.26 | 13.49 | |
1 | 1.5e-7–5e-5 | 2347.312 | 30.75 | |
I—impact on vadose zone | 9 | Basalt | 95.51 | 1.3 |
7 | Sand, gravel | 2250.12 | 29.5 | |
5 | Sandy silt | 1029.32 | 13.5 | |
2 | Silt clay | 4253.96 | 55.7 | |
LU—land use antropogenic impact | 10 | Urban industrial land | 142.99 | 1.87 |
9 | Rural industrial land | 20.79 | 0.27 | |
9 | Waterbody | 693.85 | 9.1 | |
8 | Rural agriculture land | 3796.96 | 49.7 | |
7 | Build up land | 1357.21 | 17.78 | |
3 | Tree clad area | 1439.75 | 18.9 | |
3 | Forest | 18.85 | 0.24 | |
1 | Wasteland | 163.60 | 2.14 |
