Figure 1. Cross-sectional View of the Major Sub-structural and Soil Features of Iloilo Basin (TAW)
Source: Salas, Jessica (2008), Rainwater Harvesting in IWRM for Climate Change Adaptation Project-A Report to the Sangguniang Panlalawigan of Iloilo (PowerPoint presentation).
A July 1997 interim report of the Jalaur Irrigation Systems and Rural Area Development Project Study prepared for the NIA cited a 1947 soil survey study of Iloilo province. It shows the area and percentage distribution of the various soil types in Alimodian and Santa Barbara as representative of the soil types in the Tigum and Aganan sub-watershed areas (Table 6 below).24
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