Abstract
The Hodna is strongly marked by a Mediterranean climate with a tendancy to aridity. The climatic aridity points on the weakness of precipitations the main part of the versant basin. The chain of the Hodna stands as a barrier to the atmospheric disturbances coming from north. It constitues the southern limit to Mediterranean influences. This situation is often aggraved by a high évapotranspiration and a low vegetal cover favorising erosion. Climatic aridity does not necessarily means lack of water, for the Hodna' s inhabitants have praticed for a long time an irrigation wich is based on flanned inundation. Although the precipitaitons are weak, they fall down in the form of showers redering the flows into swelling. Oueds, which are supplied by numerous springs, rising at the bottom of mountains, have brought not inconsiderable contributions. The following paradox : arid climate -abundance of water, is confirmed by the large potentialities of underground waters presented by set up aquiferous. The improvement of hydraulic situation is most possible. It lies in the recovery of rain waters thanks to process of retain and to rational exploitation of underground waters.
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