1:50,000 Scale Groundwater Resource Mapping and Vulnerability Assessment in the Municipality of Titay, Zamboanga Sibugay [Progress Report]

INTRODUCTION

The 1:50:000 Scale Groundwater Resource Mapping and Vulnerability Assessment of MGB-IX Geosciences Division in the Municipality of Titay, Zamboanga Sibugay commenced on May 14, 2019. This is part of the groundwater resource study in the entire Zamboanga Peninsula for the year 2019 which will cover 5 municipalities: Naga, Tampilisan, Kalawit, R.T. Lim,and Titay. This undertaking conducts well and spring inventory and aims to assess the vulnerability of groundwater resources that will likely be affected by global climate change and potential groundwater pollution. The assessment conducted is vital for the effective and efficient management of groundwater resources as a major source of water supply and for sustainable development.

The program in the municipality reestablished the employment of georesistivity survey as part of the groundwater resource program. To date, the team surveyed three VES points within Barangays Kipit and Dalisay. The survey aims to determine the water saturated zones in these areas. The georesistivity survey was employed in selected areas while groundwater resource inventory is being completed within in all 30 barangays that comprise the municipality.

The municipality is occupied by three river catchments. Majority of the barangays towards the west is traversed by tributaries of the Quipit River while the southeast and the eastern portions of the municipality are occupied by the catchments of the Sanito River and Bakalan River, respectively.

INITIAL FINDINGS

GEORESISTIVITY SURVEY (VES)

Georesistivity Survey. (Top) TIY VES 01 survey line is conducted at Purok Herbal, Barangay Kipit, Titay, Zamboanga Sibugay; (Bottom) TIY VES 03 survey line in Purok Orchids, Barangay Dalisay, Titay, Zamboanga Sibugay.
Location of georesistivity VES points surveyed in Barangays Kipit and Dalisay

GROUNDWATER RESOURCE INVENTORY

BarangayHydrogeological Rock UnitsMajor Groundwater Source
KipitThe area is generally covered by a thick earthy layer, and regolith of the sedimentary package of the Zamboanga Formation which underlies the whole barangay. Intercepted groundwater in the barangay appears to rely upon secondary porosity for its occurrence. These secondary pores are mostly supplied by fractures of the underlying rock unit.Several privately utilized shallow wells and dug wells occur in the area. These wells are the main source of domestic-use water in the barangay since it still has no major water source developed to supply for the whole barangay.

Georesistivity survey conducted might be able to determine the possible water-laden layer intercepted by shallow wells present in Purok Herbal and aide in the Municipal LGU’s identification of a site for its proposed well drilling.Several privately utilized shallow wells and dug wells occur in the area. These wells are the main source of domestic-use water in the barangay since it still has no major water source developed to supply for the whole barangay.

DalisayThe barangay is generally underlain by volcanic rocks. This rock unit occurs at the barangays central portion towards the south. The northwestern portion of the barangay is underlain by an extension of the sedimentary package of the Zamboanga Formation while the northeastern portion is covered by quaternary sediments of the Titay Valley. Secondary porosity and thick regolith may likely be the factors in the presence of groundwater in the area. Groundwater in this barangay permeates through unconfined weathered volcanic rocks through its secondary porosity provided by its weathering-product, regolith, and fractures through the bedrock. Wells inventoried in the barangay are generally for domestic use and is operated privately. Shallow groundwater occurs almost near surface at only 3 to 7 meters below ground.

WELL AND SPRING INVENTORY

Location of springs and wells inventoried in Barangays Kipit and Dalisay.

1. Barangay Kipit

TIT 04 is a shallow well located in Barangay Kipit, Titay, Zamboanga Sibugay. The well is 8.7m deep and privately owned by Mr. Servillo Sacal.

2. Barangay Dalisay

TIT 08 is a spring developed with an intake box. It also serves as a sump tank for discharges from other small spring in the area. It is located in Purok Bagong Silang, Dalisay, Titay, Zamboanga Sibugay. The spring was developed in 2003 and distributes potable water through a Level 2 distribution system in the Purok.

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