The Hydrological Capacity of the Quiaoit River Watershed (QRW)

Virgilio Julius  P. Manzano Jr,; Nathaniel  R. Alibuyog,

The Hydrological Capacity of the Quiaoit River Watershed (QRW)

Virgilio Julius P. Manzano Jr | Nathaniel R. Alibuyog

Abstract:

Water balance and hydrological processes under changing climate, land-use, and land cover at various scales (temporal and spatial) were investigated upon at the Quiaoit River Watershed (QRW) in Ilocos Norte, Philippines. Dependable groundwater and surface water supply vis -a-vis water demand for agricultural, domestic, environmental, and commercial purposes were assessed and examined. Data sets were gathered usingfield based monitoring at the point, reach, and catchment scales. Results indicate that water demand for all uses within the QRW is 138,865m3/day, which is around 42% of the estimated Total Resource Capacity of 336,100.8m3/day. This implies that water supply is presently adequate to meet existing agricultural (172,065.1m3/day) and domestic (10,370.4m3/day) needs. Nonetheless, supply is coming under pressure from changing land-use and urban development. In addition, land cover has changed drastically in the QRW, which imposes a negative impact on its water resources. The built-up area has almost doubled (391.24 to 743.69ha) in seven years. As such, the area of inland water decreased from 257.95ha to 33.50ha due to the increasing extraction of water for agricultural use.

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