Project Data Sheet

Project Data Sheets (PDS) contain summary information on the project or program: Because the PDS is a work in progress, some information may not be included in its initial version but will be added as it becomes available. Information about proposed projects is tentative and indicative.

PDS Creation Date
PDS Updated as of 11 Sep 2014

Project Name Angat Water Transmission Improvement Project
Country Philippines
Project/Program Number 46362-001
Status Approved
Geographical Location
In preparing any country program or strategy, financing any project, or by making any designation of, or reference to, a particular territory or geographic area in this document, the Asian Development Bank does not intend to make any judgments as to the legal or other status of any territory or area.
Sector Water supply and other municipal infrastructure and services
Subsector Urban water supply
Strategic Agendas Environmentally sustainable growth (ESG)
Inclusive economic growth (IEG)
Drivers of Change Gender equity and mainstreaming (GEM)
Private sector development (PSD)
Gender Equity and Mainstreaming Categories Category 3: Some gender elements (SGE)


Type/Modality of Assistance Approval Number Source of Funding Approved Amount (thousand)
Technical Assistance8169Technical Assistance Special Fund800
Technical Assistance-Technical Assistance Special Fund140

Summary of Environmental and Social Issues

Environmental Aspects
Involuntary Resettlement
Indigenous Peoples

Stakeholder Communication, Participation and Consultation

During Project Design
MWSS and water concessionaires
During Project Implementation
MWSS and water concessionaires


Project Rationale and Linkage to Country/Regional Strategy

Leakage reduction. Provision of water supply and sanitation in Metro Manila (Manila) is the responsibility of MWSS, a government-owned corporation. In 1997, it awarded two concession contracts to private firms for water distribution. MWSS retained responsibility for bulk water supply. Manila s main water supply source is the Angat reservoir , which provides about 97% of Manila s water supply . Water from the reservoir is conveyed through a system of tunnels and aqueducts to water treatment plants in Manila. The treated water is then distributed to households, businesses, and industries in Manila, and parts of Cavite and Rizal. The demand on the Angat water source is about 4.48 million m3/day, and is slightly decreasing from 2010 to 2015, as result from the very successful nonrevenue water (NRW) reduction programs of the concessionaires. However, following 2015, the demand will increase rapidly due to expected water supply area expansion and population growth. The demand is expected to increase by 38% in 2025, to 6.16 million m3/day About 15 years ago, MWSS recognized the need to rehabilitate the aqueducts. At that time, the total potential transport capacity of the Angat transmission system, consisting of three parallel tunnels and five parallel aqueducts, was 4.76 million m3/day. However, the actual capacity was about 30% less, due to the high leakage rate especially of aqueduct number 5. To rehabilitate aqueduct number 5, MWSS built a new parallel aqueduct (number 6) in two phases: first bypassing the upstream part of aqueduct number 5, completed in 2003, followed by bypassing the downstream part, completed in July 2012. The current capacity of the system, without aqueduct number 5, is sufficient to match the projected 2015 demand. In order to match 2025 demand, it is essential to rehabilitate to full capacity (i) aqueduct number 5, bringing potential transport capacity to 6.22 million m3/day; and (ii) the other four aqueducts, bringing potential transport capacity to 6.45 million m3/day. Besides restoring the transport capacity of the aqueducts, potential other bottlenecks will need to be identified and addressed, such as the limited capacity of the tunnels and the general configuration of the whole system. Disaster risk management. Besides rehabilitation to restore capacity, the aqueducts need to be reinforced to restore their structural integrity, reducing the risk of complete collapse, possibly due to earthquake damage. This is especially true for aqueducts number 1 and 2 which were commissioned in 1948. In addition, a proper risk assessment will be carried out, and risk management, asset management and water safety plans will be prepared.

Development Impact

Project Outcome

Description of Outcome
Progress Towards Outcome

Outputs and Implementation Progress

Description of Project Outputs
Status of Implementation Progress (Outputs, Activities, and Issues)
Status of Development Objectives
Material Changes

Business Opportunities

Date of First Listing 2012 Jul 19
Consulting Services
International consulting firm will be recruited to prepare the project
Procurement and Consulting Notices


Concept Clearance
Management Review Meeting
Approval 13 Sep 2012
Last Review Mission


Approval No. Approval Signing Effectivity Closing
Original Revised Actual


Date Approval Number ADB (US$ thousand) Others (US$ thousand) Net Percentage
Cumulative Contract Awards
Cumulative Disbursements

TA Amount (US$ thousand)

Approval Number Approved Amount Revised Amount Total Commitment Uncommitted Balance Total Disbursement Undisbursed Balance

Contacts and Update Details

Responsible ADB Officer Paulus B. van Klaveren (
Responsible ADB Department Southeast Asia Department
Responsible ADB Divisions Urban Development and Water Division, SERD
Executing Agencies


Project Website
List of Project Documents