Environmental assessment and management of the groundwater resources in the coastal area of Tanza, Cavite, Philippines
2005
Cero, D.L.
The extent of saltwater intrusion in the coastal aquifer of Tanza, cavite [Philippines] was assessed to formulate environmental management strategies for sustainability of groundwater quality. The groundwater quality of twenty-three (23) shalow and deep wells within a 2x7 kilometer coastal area was studied for nine months. Interviews of key informants and stakeholders were done to assess their awareness, concerns and perceptions of the groundwater was analyzed. Mean groundwater salinity values were were 24.2, 23.8 and 23.9 pss for deep, shallow and all wells, respectively. However, four wells-two shallow and two deep wells, in the Quaternary Alluvium had extreme salinity values. The disposal of used seawater from the fish hatchery and proximityof shallow wells to creek contributed to high salinity of the groundwater. Overpumping of two deep wells for domestic and industrial uses also caused salinity build-up. Groundwaters of deep and shallow we lls located within 100 m and 262 m from the shore, respectively, had salinity values approximating thatof saltwater (35 pps). Salinity decreased with distance from the shore. Some groundwater quality parameters exceeded existing water quality standards. Estimated groundwater deficit is 7.7 MCM [million cubic meters]/year. Comprehensive institutional and technological approaches to effective environmental management of the groundwater were proposed.
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