Ipo Dam

Also known as: Ipoh Dam (variant spelling) · Angat-Ipo diversion dam · Ipo Headworks

Definition

Ipo Dam is a concrete gravity diversion dam on the Angat River in Norzagaray, Bulacan, Philippines, forming the middle link of the Angat–Ipo–La Mesa water system that supplies most of Metro Manila’s raw water. Operated within the Metropolitan Waterworks and Sewerage System (MWSS) framework, Ipo Dam receives water released from Angat Dam upstream and diverts it through tunnels and aqueducts toward the Novaliches Portal and the La Mesa and Balara treatment plants. (Wikipedia)

Identities (Wikipedia/Wikidata/DBpedia)

Wikipedia: Ipo Dam (https://en.wikipedia.org/wiki/Ipo_Dam)
Wikidata: Q6065207
DBpedia: http://dbpedia.org/resource/Ipo_Dam

Also Known As

Ipoh Dam (variant spelling)
Angat-Ipo diversion dam
Ipo Headworks

Examples and Analogies

System role: If Angat Dam is the reservoir and La Mesa the balancing tank, Ipo Dam is the switching yard, directing flow into the aqueducts that cross the hills toward Metro Manila.
Analogy: Its function parallels a toll plaza on a highway, where the main stream is metered into distribution lanes.

Usage Scenarios

1. Daily water routing

Water district engineers schedule Angat releases and Ipo diversions to match Manila Water and Maynilad demand curves through the day.

2. Spillway operation

During typhoons, gate operations at Ipo regulate flows to protect downstream Bulacan communities.

Strategies

Coordinated Angat-Ipo-La Mesa operations conserve water during El Niño by minimizing spill and leakage.
Aqueduct redundancy projects, including new conveyance tunnels, reduce single-point failure risk for the metro supply.

Security and Safety Measures

Dam personnel conduct gated spillway drills ahead of the rainy season under protocol with the NDRRMC.
Watershed guards patrol the surrounding Angat-Ipo watershed reservation against illegal logging and encroachment that would silt the river.

Historical Context

Ipo Dam was completed in 1984 as part of MWSS works to expand Metro Manila’s conveyance capacity from the Angat system, whose original tunnel dates to the American-era waterworks of the early twentieth century. Succeeding decades added new aqueducts to keep pace with metropolitan growth. (Wikipedia)

Challenges and Controversies

Siltation and watershed degradation

Upland land use pressures raise turbidity after storms, stressing the downstream treatment plants.

Single-system dependence

Metro Manila’s reliance on the Angat-Ipo chain leaves it exposed whenever any component requires emergency repair.

References

Ipo Dam