—The Central Business District (CBD) of a city is the
activity center of the city, typically locating the main
commercial and cultural establishments, as well as acting as the
center point of the city’s transportation network. Flood risk
assessment for a CBD is crucial for proper city planning and
In this study, we model the flood risk for the CBD of
Tuguegarao City, which is located in northern Philippines. To
accomplish this, we identified important flood-related factors
whose data are either easily available or may be collected
through some automated process that we developed. We then
surveyed experts to gather their estimation of the importance of
the identified factors, and then used the AHP to determine the
consistency of the expert judgments as well as the relative
weights of each factor. These factor weights from the AHP were
applied to the gathered data, and a Quantum GIS software tool
was used for visualization, producing a geo-hazard map that is
color-coded representing 5 levels of estimated flood risks.
Using such a GIS weighted overlay analysis map as guide, the
city and municipal councils, planning agencies and other
stakeholders can act to prepare for potential flooding or, better
yet, proactively promote appropriate land-use policy that will
minimize threat to lives due to flooding.
—Analytic hierarchy process (AHP), decision
support system, geographic information system, urban
G. P. Siddayao is with the Cagayan State University-College of
Information and Computing Sciences, Tuguegarao City, Philippines 3500
S. E. Valdez is with the Agoo Computer College, Agoo, La Union,
Philippines (e-mail: firstname.lastname@example.org).
Proceso L. Fernandez is with the Ateneo de Manila University, Quezon
City, Philippines (e-mail: email@example.com).
Cite: Generino P. Siddayao, Sony E. Valdez, and Proceso L. Fernandez, "Modeling Flood Risk for an Urban CBD Using AHP and GIS," International Journal of Information and Education Technology vol. 5, no. 10, pp. 748-753, 2015.