Cartographie de danger et de risque de contamination des eaux de surface du bassin versant du Barrage de l'Oued Martil

Objectives of this article is to put at the disposal of the administrators a risk map for the contamination of surface waters in the watershed of the Oued Martil dam, allowing them to reduce the possible damages susceptible to affect them as a result of a poor management due to the lack of information. Such a map is the result of the superposition of vulnerability maps in the contamination of superficial waters and that of the danger map. The contamination danger map of the watershed of the Oued Martil dam lets appear the "Low" class correlative to the activities of the agriculture, Douars, careers, oil-works and the road, represents a percentage of 50,27%. Almost the same percentage is attributed to the very low "class"; this one coincides with the main valley and the unwooded grounds (naked lands). These two classes are ill-assorted throughout the study area. The considered contamination vulnerability map in this study is that elaborated following the application of DKPR method, considering the natural characteristics of the environment having an effect on the contamination of surface waters. About the contamination risk map of the studied dam shows the predominance of the low degree classes which extend more than 98 % of the surface of the concerned watershed. They reflect the low effect of the anthropological activities distributed on the surface of our watershed on the waters contamination.