Cagayan River - Flooding

Flooding

The Cagayan River and its tributaries are subject to extensive flooding during the monsoon season in Southeast Asia from May to October.

The average annual rainfall in 1,000 mm in the northern part and 3,000 mm in the southern mountains where the river's headwaters lie. Water from the mountains flow down very slowly because of surface retention over the extensive flood plain, the gorges in the gently-sloping mountains and the meandering course of the river.

The inundation of the Cagayan River and its tributaries have caused great loss of life and property and substantial losses to the local and national economies. The Philippine government has established several flood warning stations along the river. Experts are specifically monitoring the lower reaches from Tuguegarao to Aparri and the alluvial plain from Ilagan to Tumauini, Isabela.

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