Prepared by: Faye P. Velasco September 23, 2016
A hydrogeological survey was conducted by three (3) geotechnical personnel of the Mines and Geosciences Bureau Regional Office No. IV-A (CALABARZON) in Batangas City, Batangas Province last July 25-29, 2016.
The groundwater survey consisted of well inventory using a GPS instrument to determine the geographic location of each well. Well data were obtained from interviews of the well owners and/or barangay officials. These data include: (1) barangay name, (2) geographic coordinates, (3) well owner’s name, (4) groundwater depth, and (5) age of well.
This photo shows a deep well located in the relatively elevated Barangay San Miguel of Batangas City
A total of fifty six (56) wells and one (1) spring were plotted on a topographic and geologic base map and were used in the creation of a hydrogeological map and in the interpretation of the groundwater conditions of Batangas City.
The wells are hosted by the tuffaceous sandstone member of the Taal Tuff, the Quaternary Alluvium, and the Lobo Agglomerate while the spring is formed through fractures in the Talahib Andesite.
The photo shows a representative outcrop comprised of mudstone and agglomerate layers in Batangas City
The general groundwater flow follows a westward trend and indicates that the recharge point is located at the northeastern elevated areas that extend beyond the city limit and cover the southwestern portion of Ibaan, Batangas. Meanwhile, the groundwater at the southern part of Batangas City shows a more pronounced southward flow direction from the mountainous terrain at the southeastern part of the city’s mainland.