La Mesa Dam in Quezon City

ADAMSON UNIVERSITY COLLEGE OF ENGINEERING CIVIL ENGINEERING DEPARTMENT CE 428-Water Resources Engineering

LA MESA DAM Presented by:

Presented to: Dr. Tomas U. Ganiron Jr.

overview HISTORY OF LA MESA DAM FEATURES OF LA MESA DAM PURPOSE OF LA MESA DAM ISSUES AND CHALLENGES ADDITIONAL INFORMATION

History of La Mesa Dam

Sometime between 1920 and 1926, the Metropolitan Water District decided to build a replacement for the old Wawa Dam in Montalban, Rizal LA MESA DAM WAS constructed in 1929 during the United States administration of the Philippines

It was built in Novaliches, which was then still part of the Municipality of Caloocan due to the sloping topography of the watershed area from Bulacan.

The La Mesa dam later became part of a larger dam system with the opening of the Ipo Dam in Norzagaray, Bulacan in 1936, the Angat Dam in the same locale in 1967. The three dams formed part of the Ang a t- Ip o- La M e sa w a te r system.

La Mesa Dam turns 90 years old this year, it becomes the oldest among the three dams comprising the Angat-Ipo-La Mesa water system.

The La Mesa Dam was raised in 1959 to increase the reservoir's maximum capacity to its current level.

Features of La Mesa Dam

EARTH DAM

RESERVOIR CAPACITY IS 50.5 MILLION CU.M. (1780 MILLION CU.FT.)

Its reservoir occupies an area of 27 sq. km. (10 sq.mi.)

ELEVATION AT OVERFLOW IS 80.15 METERS (263 FT)

Critical mark At 69 meters above sea level (226 ft)

storage capacity equivalent to 19 days of Manila Water’s supply requirements

Water from the reservoir spills into the Tullahan River which transports the water to the Manila Bay

ELEVATION AT CREST IS 82.5 METERS (271 FT)

It is treated at the La Mesa and Balara Treatment Plants

Denr and mwss

The La Mesa facility has a design capacity of 2,400 million litters per day (mld)

the Balara facility has a capacity of 1,600 mld

Purpose of La Mesa Dam

The Wawa Dam which serves Manila and surrounding locales had to be replaced due to the growing population of the Manila area

Serves as a primary sedimentation basin

During dry season, it serves as a buffer or reliability dam to provide water supply

Water supply for 12 million residents in metro manila

Issues and Challenges of La Mesa Dam

while there is still enough supply from the Angat Dam, the water cannot pass through Manila Water's facility at La Mesa because the dam is drying up Manila Water deployed floating water pumps

Insufficient Water Supply for Metro Manila due to h ig h e r d e m a n d th a n su p p ly a n d unexpected water interruptions.

Large amount of rainfall

La Mesa Dam's water level falls to the critical mark of below 68.85 meters as of September 23, 2019

it is a signal for the MWSS, Maynilad, and Manila Water to regulate water supply to their customers.

dam's water level reaches its maximum level of over 80 meters, particularly during heavy rains and strong storms or typhoons, the excess water overflows to the downstream Tullahan River, threatening residents along low-lying shores of the waterway. it is a signal for the MWSS, Maynilad, and Manila Water to regulate water supply to their customers.

If it was El Nino, then all of our water reservoirs would dry up as well. However, both Angat Dam and Ipo Dam are at normal levels. Only La Mesa Dam was experiencing the critical water level.

Construction of kaliwa dam to avoid recurrence of water shortage supply. But it was not pushed through because the kaliwa dam will destroy 291 hectares of the sierra madre

Additional Information about La Mesa Dam

Rehabilitation of the deteriorated section of Aqueduct No. 5.

Once commissioned, the project will allow more efficient conveyance of raw water from Angat Dam to the La Mesa Dam and Balara water treatment plants.

An estimated 394 million liters per day (MLD) of water lost daily due to leakages will be recovered which can be used to augment supply for improved water availability and for expansion areas in Rizal and Cavite Provinces.

The project is a critical component of Metropolitan Waterworks & Sewerage System's (MWSS) Water Security Legacy Program (WSLP) that aims to ensure adequate and uninterrupted water supply for Mega Metro Manila.

Project objective The project is a concrete manifestation of MWSS's firm commitment to ensure water supply security to Metro Manila. As such, its primary goal is to safeguard the integrity of raw water conveyance from Ipo Dam to the La Mesa portals.

beneficiaries Once completed, the project is expected to serve the needs of an additional 6 million people. By the first quarter of 2013, AQ-6 is envisioned to drastically reduce the risk of water shortage, 50% of its total output being intended for Metro Manila.

Additional beneficiaries are the people of Caloocan City and San Jose Del Monte City, Bulacan. The project is expected to spur development and ensure continuous supply of water in these areas.

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