Independent variable

Risk area—buffer of 500 meters (RA500)

Risk area—buffer of 750 meters (RA750)

Rainy

Dry

Rainy

Dry

Total Coliforms (TC)

0.059

NS

0.074

NS

Nitrate (NO₃)

0.194

0.020

0.033

0.116

Ammonia (NH₃)

NS

NS

NS

0.033

Environmental Salubrity (ESI)

NS

0.434

Number of flooding points

in the risk area (NPts)

0.004

0.144

Drainage typology (Type750)

−1.00

(Firm and Lowered Land)

Mean elevation the terrain (Elev500/Elev750)

0.04

0.084