Re-hydrating the underground water, Ninh Phuoc, Ninh Thuan, Vietnam

Abstract

    Contour trenches will trap and slow down runoff water. In the trenches, rain water will infiltrate and be stored into subsurface layers. Surface runoff and erosion will then be prevented and the slower sub-surface flows will furnish water over a longer period of time. Construction of sand storage dams in the main creeks alongside the trenches were proposed to catch water at surface level and divert it at subsurface level sidewards, in this way creating a spread in subsurface water movement. Diverting and spreading the subsurface water streams will keep the water at a higher level preventing a single deep subsurface water movement and increase time of water percolation to underground water. From 2007, two pilot areas have been carried out in Phuoc Nam Comue, Ninh Phuoc District, Ninh Thuan Province, the most drought areas of Vietnam. It shows an initial good results according to the study carried out from 2008-2011 to assess the effects of these constructions into water conservation and increasing ground water table. It is necessary to expand these technic to improve the efficiency of these constructions in Phuoc Nam, Ninh Phuoc, Ninh Thuan.