PERTANIKA JOURNAL OF SCIENCE AND TECHNOLOGY

The Taguibo River Watershed and Forest Reserve (TRWFR) is the main source of water consumption and irrigation supply in Butuan City, but the irrigation supply is often insufficient, particularly during dry seasons. Competing demands for water further exacerbate the problem, leading to a reduction in water available for irrigation. This study aims to assess the Taguibo River irrigation system diversion dam using the Analytical Hierarchy Process (AHP) and Geographic Information System (GIS) tools. The dependable flow of the diversion dam was investigated to assess the sustainability of water, which resulted in 466.94 lps, and the AHP analysis identified river discharge as the most important factor in suitability assessment. The generated suitability map shows the specific sites suitable for dam construction within the river, covering approximately 88,599.17 m2 or 0.16% of the study area. The existing suitability map, in contrast, focused on the entire study area and disregarded the river network as a criterion, resulting in a much larger proportion (68%) of the area being deemed suitable. Overall, the study found that the Taguibo River irrigation system diversion dam is highly suitable based on the selected criteria, and the current suitability map provides valuable information for site selection and construction.

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