Flood risk assessment for Davao Oriental in the Philippines using geographic information system‐based multi‐criteria analysis and the maximum entropy model

Abstract. The Philippines, as a part of Southeast Asia, falls into the zone categorized with agricultural areas prone to drought. Mitigating the concerns due to such vulnerability and also catering the needs of small-time farmers, rainfall harvesting with the use of agricultural structures called Small Farm Reservoirs (SFRs) used for storing water for irrigation are being used and deployed. This study aims to identify ideal locations for SFR which is essential due to the concerns of its geographical appropriateness and its vulnerability to environmental and other concerns such as seepage, sustainability, and optimizing yield. Geographic Information System through the ArcMap software is a modern tool for decision making, especially in the concerns of suitability and vulnerability assessment and was used in creating the suitability map for SFR in this study. The suitability map was created with the use of pre-processed raster data sets for precipitation, soil texture, slope, irrigation status. Weights for the weighted overlay were acquired from the standardized protocol for Small Scale Irrigation Project (SSIP) standardized protocol for site suitability identification from the Department of Agriculture - Bureau of Soil and Water Management (DA-BSWM) Philippines. Existing SFRs in the study area were validated through site visitation and were evaluated for usability and performance. The suitability map created accurately identified suitable zones for establishing SFRs with a result of 7 out of 7 existing SFRs are within the suitable zones, six (6) sites in the moderately suitable and one (1) on marginally suitable.

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Index-based flood risk assessment for Metro Manila

Water Science & Technology Water Supply ◽

10.2166/ws.2020.010 ◽

2020 ◽

Vol 20 (3) ◽

pp. 851-859 ◽

Cited By ~ 1

Author(s):

C. J. Rubio ◽

I. S. Yu ◽

H. Y. Kim ◽

S. M. Jeong

Keyword(s):

Risk Assessment ◽

Land Use Planning ◽

Flood Risk ◽

Flood Hazard ◽

The Philippines ◽

Flood Risk Assessment ◽

Disaster Insurance ◽

Metro Manila ◽

Hazard And Risk ◽

Populated Region

Abstract This study focuses on index-based flood risk assessment in Metro Manila, the capital region of the Philippines and most densely populated region in the country. Its objective is to properly address urban characteristics in flood risk assessment by introducing a specific urban-type set of physical, social, economic and ecological indicators. Analytical hierarchy process (AHP) was used to quantify the optimal selection weights for each of the selected 14 indicators. Five levels of flood risk will be presented in spatial maps using geographic information system (GIS) ranging from Very Low Risk to Very High Risk. Results of this study are expected to aid in understanding flood hazard and risk in Metro Manila. Moreover, the resulting flood risk information can be used as a decision tool in policy making, land-use planning, developing guidelines and countermeasures and flood disaster insurance.

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Flood Vulnerability, Risk, and Susceptibility Assessment

Advances in Environmental Engineering and Green Technologies - Decision Support Methods for Assessing Flood Risk and Vulnerability ◽

10.4018/978-1-5225-9771-1.ch001 ◽

2020 ◽

pp. 1-27

Author(s):

Mohd Talha Anees ◽

Ahmad Farid Bin Abu Bakar ◽

Lim Hwee San ◽

Khiruddin Abdullah ◽

Mohd Nawawi Mohd Nordin ◽

...

Keyword(s):

Remote Sensing ◽

Information System ◽

Geographic Information System ◽

Flood Risk ◽

Geographic Information ◽

Susceptibility Assessment ◽

Flood Vulnerability ◽

Local Conditions ◽

Flood Susceptibility ◽

Flood Risk Mapping

Flood can be assessed through flood vulnerability, risk, and susceptibility analysis using remote sensing, geographic information system, and hydrological modelling. In this chapter, different stages, complexities, and processes of flood vulnerability, risk, and susceptibility assessment were discussed. The study reveals that flood vulnerability should be assessed based on four aspects: physical, social, economic, and environmental. Flood risk should be assessed by three stages: risk analysis, disaster relief, and preparedness, whereas flood susceptibility assessment involves three processes. Overall, it was found that the responsible factors vary as per the local conditions, which need to be carefully analyzed and selected. Furthermore, the role of remote sensing and geographic information system in flood risk management were found important especially in flood risk mapping and in the selection of responsible flooding factors.

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