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Mt. Isarog supports a network of interlacing streams and numerous springs. These water bodies provide potable water to 571,676 people of the 15 of the 37 municipalities and cities of Camarines Sur and irrigation water to 67,400 hectares of Riceland. There are seven (7) identified sub-catchments areas distributed and located as follows:
A. Tinablanan Sub-Catchment. Located at Barangay Del Rosario and Sto. Niņo of Ocampo, Camarines Sur. Included in this sub-catchment area are adjacent barangays of Gatbo and Salvacion. This has an estimated area of 1,056.75 hectares or 10.45% of the total land area of the PA and drains to the Pawili River.
B. Salog-Maalsom Sub-Catchment. Found in the municipality of Goa with a total area of 1,043.75 hectares and covering 10.32% of the park's total area. It covers barangays Hiwacloy and Digdigon of said municicpality and drains to Lagonoy Gulf.
C. Himaao Sub-Catchment. Can be found in the Barangay of Curry and Sto. Niņo and extends to Barangays Del Rosario, Bagong Sirang and Himaao of Pili, covering an area of 868.75 hectares. It is adjacent to Tinablanan Sub-Catchment and drains to Anayan River.
D. Rangas Sub-Catchment. Can be found in the eastern portion of Mt. Isarog, which form part of the crater comprising an area of 787.7 hectares or 7.79% of the parks total area. It includes Barangay Catagbacan and some areas of Barangay Aroro in Goa.
E. Tigman Sub-Catchment. Can be found in the junction of the Municipalities of Tinambac and Calabanga of which Barangays Cawaynan and Harubay are the immediate communities and extend up to the Barangays of Cumaguingking and Bolao-Balite. It covers 750.34 hectares or 7.42% of the parks total land area, just adjacent to Inarihan and Lupi Sub-Catchments. It drains to San Miguel Bay.
F. Inarihan Sub-Catchment - can be found within the boundaries of the Municipalities of Naga and Calabanga and includes the Barangay of Panicuason and part of the watershed divides of Barangay Lugsad. It has an area of 707.32 hectares or 6.99% of the total area of the park. It drains to Inarihan River and likewise to San Miguel Bay.
G. Lupi Sub-Catchment - can be found in the municipalities of Tinambac and Goa with Barangays Payatan and Lupi in its immediate vicinity. It has an area of 553.12 hectares or 5.47% of the total area of the park.
Eighteen (18) major rivers and creeks criss-crossing the whole area drain these seven sub-catchment areas.
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