groundwater situation in metro manila and nearby areas

NWRBNWRB

Groundwater Situation in Metro Manila and Nearby Areas

National Water Resources Board

21 OCTOBER 2010

National Water Resources BoardNational Water Resources Board

Studies:

2004 – Water Resources Assessment for Prioritized Critical Areas (Metro Manila and Cebu City)

2008 – Economic Valuation of Groundwater in Metro Manila and Nearby Areas

2010 – Re-assessment of Water Resources for Metro Manila and Nearby Areas


Manila

The Study Area

MWSIMWCI


Manila

Existing Situation

• Declining water tables– 1982-1990: 2.5 m per year– 1990-1996: 6-12m per year– 1994-2004:• more than 100 meters in Taytay • more than 80 meters in Pasig• more than 60 meters in Quezon City–

Caloocan City area• more than 20 meters in Imus-Bacoor area


Existing Situation

• Salt water intrusion

– Affected areas: coastal areas of NCR, Bulacan, Cavite and Pampanga (EC ranges from 1,500-5,000 μS/cm)

• Land subsidence

– Sea level rise: 2.36 cm/yr


2008 GROUNDWATER LEVEL IN METRO MANILA AND NEARBY

AREAS

(Rizal, Bulacan, Cavite and Laguna)

Cones of Depression (critical areas) in the vicinities of Guiguinto-Balagtas-Sta. Maria area, Meycauayan-Marilao-Bocaue area,Quezon-Makati-Parañaque-Muntinlupa-Las Piñas in Metro Manila, and Bacoor-Kawit-Cavite City area.


SALINE INTRUSION

Presence of saline water along the coastal municipalities including Quezon, Taguig and Muntinlupa City


In 2035, groundwater depletion includes Sta Rosa, Biñan and San Pedro in Laguna, Binangonan, Angono, Taytay and Cainta in Rizal, Imus and Dasmariñas in Cavite.


FORMULATED POLICIES:

For Areas Connected to MWSS :

Critical Areas :• No new permits• Revocation of existing permits• Reduction of extraction rate• Higher water extraction fees

Non-Critical Areas :• Will process permits but on certain

conditions


For Areas NOT Connected to MWSS :

Critical Areas :• Will process permits but will limit

validity until connection becomesavailable

Non-Critical Areas :• Will allow processing of permits

FORMULATED POLICIES:


The existing policy on Critical Areas approved by the Board in 2006 is still under review.

It is recommended that the whole Metro Manila be declared as critical areas due to:

1.Boundary issues

2.GW interconnectivity


Policy Options/Recommendations

• Groundwater monitoring

– All existing wells and pumps have to be

inventoried and monitored: pumping rates, water production, water levels, water quality, production costs

– Updating of database

– Automatic closure of illegal wells



• Improvement of water service delivery– MWSS, through its concessionaires, and the

various Water Districts in the study area should improve its service so as to provide reliable supply of water with satisfactory pressure for 24 hours per day. They also have to submit plans for future water supply sources to meet the future demand requirements.



• Development of sewerage system and wastewater treatment facilities

– The allocation of NIA (or part of it) in the use of water from Angat Dam for irrigation purposes can thereby be transferred to Metro Manila (for domestic, commercial and industrial use) while the treated wastewater from Metro Manila can be used for irrigation and non-potable uses.



• Public awareness and partnership– IEC on the:

• economic value of water resources• extent and impacts of over-extraction of

groundwater• impacts of pollution on public health,

ecosystems and economic development• impending water scarcity due to climate

change and increasing demand – Promoting the recycling of water/treated

wastewater– Reporting of illegal wells


RECOMMENDATION:

A Memorandum of Agreement (MOA) between the National Water Resources Board and Local Government Units (LGUs) be made to address the current issues for more effective and efficient management of Metro Manila’s groundwater.

groundwater situation in metro manila and nearby areas

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