Steps | Methods | Processes |
1 | Identification of parameters | Choice of used parameters to calculate the pollution vulnerability index |
Thematic mapping | - mapping each parameter at the scale of the studied watershed - discretization of each parametric map (Cell size = 20 × 20 m) | |
Reclassification of parameters | Each parameter is subdivided into 3 or 4 classes according to the ratings or weights assigned | |
2 | Weighting of parameters | Prioritize the parameters relative to each other by Saaty method |
3 | Vulnerability assessment | Combination of the different thematic maps by weighting to obtain a final map of the vulnerability index distribution |
4 | Determination of protection perimeters or zones | Delimitation of protection perimeters or zones (Zone 1, Zone 2 and Zone 3) according to the vulnerability map |