METHOD
•   The soil attributes and the corresponding weights used for calculating the vulnerability index for pollution by runoff (surface waters) are:
•Soil type. For “Lithosol”, “Andosol”, “Glacier”, “Rock Outcrop” the weight is “1”.
•Presence of an impermeable layer within the soil profile. If the impermeable layer is within 0-40 cm than the corresponding weight is “1”.