Abstract

VELOZA FRANCO, Jairo Alfredo  and  MORALES ARIAS, Carlos Julio. HIDROGEOLOGICAL AND HIDROGEOCHEMICAL STUDY IN THE MANI CITY, DEPARTAMENTO DE CASANARE. bol.geol. [online]. 2009, vol.31, n.1, pp.71-83. ISSN 0120-0283.

Geology, Hydrogeology and Hydrogeochemistry play a crucial role in the evaluation of wells and cisterns for drinking water especially in municipalities like Maní because in times of low rainfall has not been sustainable water resources. Maní hydrogeological system is determined by interesting primary porosity reservoirs. However, given the inaccuracy and poor analysis that has been done to the aquifer is necessary to develop this study because the wells and cisterns were built in craft conditions without any professional and technical support. It´s important to emphasize that Maní has no a sewer system, so the groundwater resources are highly vulnerable to contamination, which has been analyzed for the temporal and spatial evolution of the aquifer through piezometers maps in times of low and high precipitation. Hydrogeochemistry evaluation becomes more important to confirm the possible hydraulic connections surface water - groundwater, identifying chemical conditions and their behavior in the deposits and geological formations from the Pie de monte Llanero. High PO₄ levels and the presence of As are mainly due to agricultural activities using large amounts of pesticides, fertilizers and insecticides.

Keywords : Groundwater; hydrogeochemistry; piezometry and geophysics.

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