The Bicol River Basin
abs-cbnNEWS.com | 10/23/2009 3:40 PM
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This is the map of tributaries and flood-prone areas around the Bicol River basin from Pagasa’s Flood Forecast Branch. The text below the map gives general information about the Agno River Basin and its environs.
Fast Facts:
- Location: Bicol Peninsula
- Draining area: 3,771 sq. km.
- Encompasses:
- Central portion of Camarines Sur
- Northern portion of Albay
- Portion of Camarines Norte
- Medium-sized basin, Southern Luzon
Flooding:
- Annual water runoff: 5,100 cubic meters
- Starts from Mayon Volcano (4,421 m elevation) and goes in a northwestward direction
- Average annual rainfall:
- 2,000-3,600 mm in southwestern section of basin
- Tropical cyclone passages, northeast monsoon and orographic effect: flood-producing rains in the basin from May to February
- Storm surges associated with slow-moving typhoons: causes flooding from the sea in the alluvial plain near the mouth of the river or over San Miguel Bay (Bicol)
- Flood target areas:
- Central part of basin: from Baao lake to Bato lake
- Alluvial plain (extends from Naga City to the river mouth or over San Miguel Bay)
Connecting water ways and nearby mountain ranges
- Principal tributary: Sipocot River (Bicol)
- This river cuts through mountainous terrain and has a steeper slope
- The Bicol River widens to more than 1,000 meters across after joining Sipocot River before discharging water into the San Miguel Bay (Bicol)
- East of river basin: chain of volcanoes
- West of river basin: highlands and lowhills
- Bicol Plain: between Eastern Bicol Cordillera and Ragay Hills (Bicol)
- Water run off from Mayon Volcano:
- Regulated through:
- Bato lake
- Buhi lake
- Baao lake
- Stream-flow reaches the mainstream of Bicol River
- Regulated through:
Source: Pagasa Flood Forecast Branch
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