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HOGGAR HYDROGEOLOGY

hydrogeology gives a great importance for the development of centers of mining in a desert area like Hoggar.
The hydrogeologic research, undertaken by the EREM between 1969 and 1987 (Zerourou Mr. and Benoua E.H., report/ratio 620), proceeded in two phases, with like objective:

• 1969-1973: to meet the requirements out of drinking water for the centers for life like Tamanrasset and In-Eker. Isolated drillings of prospection, carried out during this phase, were reconverted in drillings of drinking water exploitation;
• 1973-1987: research of significant reserves out of water in preparation for the introduction of new layers:

• Tirek and Tiririne (With)
• Timgaouine, Abankor and Tinef (u)
• Bachir, Chock-Amzi-El Karoussa (W-Sn)


Of vast territories was covered by a hydrogeologic prospection with estimate of the resources. All the areas located near the layers were studied in detail with estimates of the subsoil water reserves necessary to the development of mining centers. Different the aquifers defined by this work are, by order of decreasing interest:

• aquiferous of the intercalated continental sandstones of the higher Cretaceous of the Basin of Tanezrouft (SW of Hoggar borders): the exploitable reserves are enormous (very great side and vertical extension of these sandstones);
• aquiferous of the sandstones of Cambro-Ordovicien, of the basins of Chock-Seririne (borders Southern of Hoggar) and of Tafassasset (SE of Hoggar borders): the exploitable reserves are significant (great side extension but power of the variable sandstone);

• aquiferous in basalts of the area of Silet (Hoggar center): the extension is weak bus only the old alluvia of palovalles filled by thirdly-quaternary basaltic castings are interesting.Circulations are fissurales;

• aquiferous of the crystalline base: they are related on the crust of deterioration and the great fractures. The extension of the crystalline formations is significant but the power of the faded crust is low;

• aquiferous of the old and recent alluvia of the Quaternary one: the tablecloths of infro-flows related to the alluvia constitute not very significant reserves (low power of the alluvia and tendency generalized with the fall of the water level). Moreover, the risks of pollution related to the human activity are significant. The four great aquiferous sets can thus largely meet the requirements out of water for all the mining layers discovered in Hoggar. Considerable surpluses could be even released for a possible development of agriculture around certain localities.

 
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