Aquifer/Water Sources Drip Factor as Alternative to Measure Climatic Effects on Disponibility of Water Agricultural Irrigation in Semi-arid/Arid Zones

On semi-arid/arid regions (SA/A), new climatic conditions transformed irrigation water on scarce and to obtain efficiency on its use (Eu) is necessary it dosage (D). Under Crops quality and the aim to avoid losses by drainage, evaporation and runoff is necessary implement alternatives front to risks and encountered mechanisms for counteract H2Oi lack and promote Eu and D. Any aquifer to plan, requires immediately know the volumetric exchange (Delta V(x, y, t)) between regional aquifer and sources hydric. Therefore, the objective was determine the spatial variation of drip factor (Fg) between aquifer/water tributaries and take it as indicator of Delta V(x, y, t) behaviour in SA/A coastal agricultural valley of Northwest of Mexico known as " Heart Agricultural of Mexico". Fg results respond at linear expression y = 26.70 x -44.15, an annual range average of 413-1813 m/year governed by porous media and recharge dynamics closely linked to transitivity anisotropy low to medium (R-2 = -0.6) and included on range 20-70 m2/day. In few occasions the river and streams yield water to aquifer (rainy seasons), and on dry season; only the aquifer gives large amounts to all region tributaries. The low sensitivity response at dripping and climatic presence changes constitutes a high risk for H2Oi and sustainable agriculture due to continuous downward trend of watertable levels that encourage an overexploitation responding at lack water and the occurrence of big agricultural economic losses caused by the last intense droughts continually confronted this region. Knowing Delta V(x, y, t) balance helps at control water losses, at sustainable agriculture and contributes to achieving goals of Eu and D; adapted to new agricultural uses forced by climate change.