|
| Hazard | Hazardous event | Likelihood avg (SD) | Severity avg (SD) | Risk level avg (SD) |
|
| Chemical | High level of dissolved salts in water | 4.11 (0.65) | 3.41 (0.58) | 14.04 (3.26) (high risk) |
|
| Microbial and chemical | Excessive algal formations in water storage tanks | 2.93 (0.52) | 3.40 (0.66) | 10.15 (3.19) (high risk) |
|
| Microbial | Sewage collection within 200 m of the borehole | 2.38 (0.73) | 2.97 (0.79) | 7.48 (3.76) (medium risk) |
|
| Microbial | Water leakage between water well and water storage tank | 2.54 (0.63) | 2.82 (0.63) | 7.41 (3.21) (medium risk) |
|
| Microbial | The leaking water forms stagnant ponding within 10 m of the borehole | 2.49 (0.74) | 2.69 (0.75) | 7.09 (3.50) (medium risk) |
|
| Chemical and microbial | Spilled water drainage channels are absent or cracked or unclean | 2.40 (0.70) | 2.67 (0.73) | 6.77 (3.44) (medium risk) |
|
| Microbial | Human, animals, or birds excreta on the ground within 10 m of the borehole | 2.25 (0.66) | 2.80 (0.75) | 6.62 (3.29) (medium risk) |
|
| Microbial | The fence of the water well is inadequate to prevent the entry of animals | 2.36 (0.64) | 2.68 (0.66) | 6.61 (3.10) (medium risk) |
|
| Chemical | Accidental spillage of diesel or other chemicals within 100 m of the borehole | 2.33 (0.65) | 2.68 (0.76) | 6.60 (3.30) (medium risk) |
|
| Chemical, microbial, and physical | The cement cap of a borehole is absent, cracked or unclean | 2.33 (0.66) | 2.57 (0.69) | 6.29 (2.99) (medium risk) |
|
| Chemical and microbial | The pump house at the point of attachment to the borehole base is loose | 2.28 (0.72) | 2.53 (0.74) | 6.16 (3.15) (medium risk) |
|
| Chemical and microbial | Stockbreeding, agricultural activities within 50 m of the borehole | 2.19 (0.60) | 2.60 (0.69) | 5.96 (2.71) (low risk) |
|
| Microbial | Rainstorms or floods affect the borehole area | 2.20 (0.76) | 2.38 (0.80) | 5.72 (3.41) (low risk) |
|
| Chemical, microbial, and physical | Waste disposal site or landfill within 300 m of the borehole | 2.07 (0.66) | 2.29 (0.76) | 5.15 (2.99) (low risk) |
|
