Demonstration Areas for Rainwater Harvesting
at Tigum-Aganan Watershed
Rainwater collection, popularly known as rainwater harvesting is considered a traditional technology for water supply. But with the continuous conduct of research by the scientists, rainwater harvesting systems has been found to evolve from its traditional use. Rainwater harvesting systems are now being used for environmental protection through soil and water conservation; used to mitigate floods and droughts and used to mitigate impact of climate change. These changes demonstrated the fact that the system has evolved and can be used for achieving the Millennium Development Goals.
The Iloilo Watershed Management Council (IWMC) and the United Nations Environment Program (UNEP) piloted the use of rainwater harvesting in five demonstration areas at the Tigum-Aganan Watershed. The areas demonstrate the use of rainwater used in forested area (Maasin); rainwater in upland agriculture (Alimodian); rainwater in lowland agriculture (Sta. Barbara); and rainwater in the City. Selection of the demonstration areas was based on the GIS map showing the sub-basin location of the area in the Tigum-Aganan Watershed. The sub-basin location of the demonstration area characterizes each area by the following: area of catchment; type of soil, volume of rain during rainy and dry seasons, and surface run-off during rainy and dry seasons.