Savu Island is a semiarid region with few rainfalls. The meager annual rainfall of
about 1,000-1,500 mm that lasts for three to five months tends to cause draught. To cope with
this situation, the Author tries to develop a rainwater management model located in Daieko
village. This model constitutes an infrastructure that consists of check dam series which are
constructed by simulating a computerized model of decision supporting system called "Rainwater
Management for Agriculture Decision Support System (RMA-DSS) model" in the research
location of Daieko village. Employing a simulated RMA-DSS model; the locations for check-dam
series, and dug-wells can be determined, the size of potential irrigable lands can be determined
based on water balance analysis of water samples taken from simulated check dams and
inundated lands. Through this model the sufficiency of water supply for agricultural purposes
and the land size for cultivation area can be predicted with a high degree of certainty.