San Roque Dam: Overview
📍 Location: San Manuel, Pangasinan, Philippines
🌊 River System: Agno River Basin
🎯 Purpose: Flood control, irrigation, hydroelectric power generation, and water supply
🏞️ Main Tributaries (Water Sources Feeding Into the Dam):
San Roque Dam receives water primarily from the Agno River, one of the largest river systems in the Philippines. Its key tributaries include:
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Ambuklao River – upstream in Benguet
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Binga River – source near Itogon, Benguet
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Upper Agno River – the primary channel flowing from the Cordillera mountains
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Tuel River – a contributing tributary within the watershed
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Ipo River – a smaller tributary joining the main Agno stream
These tributaries converge and flow into the Agno River, which is dammed at San Manuel to create the reservoir for San Roque Dam.
🚰 Outlets (Where the Water Goes):
Once stored in the dam, the water is utilized or released through various outlets:
1. Spillway (Flood Control)
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Releases excess water during heavy rains to prevent downstream flooding.
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Flows into the lower Agno River, eventually reaching Lingayen Gulf.
2. Irrigation Outlet
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Supports irrigation for around 708 km² of agricultural land in Pangasinan, Tarlac, and Nueva Ecija via the Agno River Integrated Irrigation System (ARIIS).
3. Powerhouse (Hydroelectric Energy)
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The dam has a capacity of 435 megawatts, supplying electricity to Luzon Grid.
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Water passing through turbines is released back to the river after generating power.
4. Domestic and Industrial Water Use
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Regulates water supply downstream, which may be used by local communities and industries along the Agno River.
🌿 Environmental & Watershed Context:
The San Roque Dam watershed covers parts of Benguet, Nueva Vizcaya, and Pangasinan, and is part of the Upper Agno River Watershed Forest Reserve—crucial for maintaining water quality and supply.
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