The Mines and Geosciences Bureau Regional Office No. XI has completed the conduct of Groundwater Resources and Vulnerability Assessment and Geo-resistivity Survey of Digos City and Municipality of Padada, Davao del Sur from February 8, 2021 to April 17, 2021. The team was headed by Supervising Geologist Herbert T. Villano together with Sr. Geologist Rae Angeline S. Palen, Geologist/s Marie Anne E. Garcia and Lea Mae T. Oracion, Science Research Specialist Ignacio C. Ortiz Jr. and Driver Michael S. Reyes.
The study aims to determine the availability of groundwater in various rock units, establish quality/chemistry of groundwater in groundwater basin, and determine the thickness of the aquifers, and produced vulnerability map to which can be used to evaluate the groundwater pollution potential based on the hydrological, geological, hydrogeological and soil properties of any area in the different municipalities and cities. Also to provide information on the type of underlying materials based on resistivity values and its potential water-bearing characteristics.
The activity includes data gathering of water sources such as geographic location of the wells and springs, static water level, depth of wells, discharge of wells and springs, classification of groundwater distribution, lithological logs, among others. Physical water quality of each water sources was also assessed and analyzed such as pH, temperature, total dissolved solids, and electrical conductivity. Moreover, some samples were also collected subject for chemical analysis to determine the percentage of major ions and cations, physical analysis, and heavy metals such as Pb, Cd, As, Mn, Cu, and Fe.
Geologic outcrops were mapped and described to understand the movement and distribution of groundwater on the underlying rock units and identify areas that area recharge and discharged zones.
Groundwater is a very important natural resource and has a significant role in the economy. It is the main source of water for irrigation and the food industry. The importance of the assessment is to address some issue in society today which include groundwater pollution, overexploitation, and groundwater contamination. It has also a big role in the formulation of the Comprehensive Development Plan (CDP) and of the Comprehensive Land Use Plan (CLUP) of the Local Government Units (LGUs).