As of 6:00 AM of January 12, the water level of the Angat Dam is 200.59 meters, 11.41 meters below its normal high water level, 4.86 meters below the rule curve and dropping at a rate of 10 and 15 centimeters per day.  Climatologist forecasts that Angat will receive 96 millimeters of rainfall this January, implying that favorable inflow will not significantly raise the dam’s storage.  Simulations also support that the 180 meters critical level will be breached before the rainy season, if voluntary conservation efforts are not undertaken.  Following the Angat water protocol, at 180 meters, the priority allocation of raw water is for domestic use.

In a meeting chaired by the NWRB on 11 January 2022, with MWSS, NIA, Maynilad, and Manila Water on the possible reduction of allocation, a win-win solution was arrived at to save the crops that were already planted by the Bulacan farmers while ensuring continuous water supply for MWSS customers.  Cloud seeding operations in the Angat, Ipo, and La Mesa watersheds, the purchase of shallow tube wells, fuel subsidies for the re-use of water from drainage and creeks, and support to NIA’s information and education campaign are part of a package of assistance in the event of curtailed allocation to irrigation.

To support the twin objectives of water and food security, the MWSS and its Concessionaires has put in place supply augmentation measures to ease the pressure in the already drought-like trend of Angat and the sustainability of clean, potable water to the 19 million people in the service area.

WEST CONCESSION AREA (Maynilad) EAST CONCESSION AREA (Manila Water)
1.      Non-Revenue Water (NRW) reduction of 40MLD for summer and additional 42MLD at the end of 2022;

2.      Operation of existing 12MLD deep wells (1MLD existing and additional 11MLD for summer);

3.      Operation of 4MLD Portable Water Treatment Plant by February 2022 and another 18.6 MLD by September 2022 in Cavite;

4.      Operation of the backwash recovery system in La Mesa Water Treatment Plants No. 1 & 2; and

5.      Network pressure management to equally distribute the available water through

the regulation of 1,200 Pressure Regulating Valves (PRVs) and 50 primary Valves in the Bagbag network system

 

1.      Maximization of the Cardona Water Treatment Plant’s capacity, drawing raw water from Laguna lake, to produce from 80MLD to 100 MLD;

2.      Operation of existing 115MLD deep wells (80MLD existing and additional 35MLD for summer);

3.      Operation of the 20MLD Marikina Portable Water Treatment Plant drawing water from the Marikina River;

4.      Operation of the backwash recovery system in Balara Treatment Plants;

5.      Network pressure management to equally distribute the available water through 1,130 PRVs and 180 PRV Controllers at critical locations; and

6.      Harnessing water from the Alat Dam, located upstream of the La Mesa Dam.

Note: MLD – Million Liters per Day

 

To meet peak season demand (the period of highest water use due to hot weather and low incidence of rainfall) additional 70 MLD is ready to be used in the East Zone from Manila Water’s completed projects: the 50 MLD Rizal Wellfield and 20 MLD Marikina Portable Water Treatment Plant.

Infrastructure projects expected to be completed between 2022 and 2023, provides the confidence of improved supply in time for the summer of 2023.

  • 6 MLD Cavite Phase 1 Portable Water Treatment Plant (2022);
  • 20 MLD Taguig Portable Water Treatment Plant (2023);
  • 150 MLD Poblacion Muntinlupa Water Treatment Plant 4 – Laguna Lake (2023);
  • 80 MLD Calawis Antipolo Source System (2023); and
  • 6 MLD Cavite Phase 1 Portable Water Treatment Plant (2022);
  • 20 MLD Taguig Portable Water Treatment Plant (2023);
  • 150 MLD Poblacion Muntinlupa Water Treatment Plant 4 – Laguna Lake (2023);
  • 80 MLD Calawis Antipolo Source System (2023); and
  • 50 MLD East Bay Phase 1 Laguna Lake (2023).

The MWSS Board has also approved the implementation of the following medium-term water source projects from 2024 to 2025:

  • 1 MLD Cavite Phase 2 Portable Water Treatment Plant (2024);
  • 200 MLD East Bay Phase 2 Laguna Lake (2024);
  • 438 MLD New Wawa Dam Project (2025);
  • 600 MLD Kaliwa Dam Project (2025); and
  • 250 MLD Kaliwa River Phase 1A – Unsolicited Proposal (2025).

Moreover as part of the re-engineering works of the Angat-Ipo-La Mesa raw water system or the Angat Water Transmission Improvement Project (AWTIP) projects the :  the 15 kilometers Aqueduct No. 7 or AWTIP: BNAQ #;  and the 6.4 kilometers Tunnel 5 of the AWTIP: Tunnel 5,  are already in its Detailed Engineering Design  (DED) phase.  Their completion in the 3rd quarter of 2024 will optimize the flow of excess water from Ipo to La Mesa Dam.

To secure the water future of our customers in Metro Manila, Bulacan, Cavite and Rizal for the next 30 years, the following projects are considered as part of the infrastructure roadmap:

  • 550 MLD Kaliwa River Phase 1B – Unsolicited Proposal (2027); and
  • 3000 MLD Kanan/ Agos River Phase 2 – Unsolicited Proposal (2037).

Regardless of the Angat Dam level, water is a finite resource which must be conserved.  MWSS advocates the wise-use of water through more water efficient technologies, practices, and behavior changes in line with the new sources of raw water supply.  Any government measure to maximize supply will not be as effective we who use water do not do so efficiently.  MWSS strongly appeals to the public to embrace wise water use as a daily habit to ensure continued supply until the rainy season.