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Timor Island is a tropical climate with an average annual rainfall of 1,183 mm / year so that livestock-farming is carried out based on dryland agriculture. The limited water source is the main limitation for farmers in processing land for planting holtikuktura as a main effort in fulfilling their daily needs and forage for livestock as a side business. For this reason, technological innovations in water management are needed, especially rainwater with rainwater harvesting techniques. This study aims to find out how much rainwater is able to be accommodated during the rainy season period using the cage roof method and its utilization in horticulture and forage crops through drip irrigation systems. The results obtained are the amount of rain water that can be accommodated during one rainy season period which is equal to 32 m3 while its use with the drip irrigation system to meet the water requirements for horticulture plants in the form of chilli is 6 m3, cucumber is 7.2 m3 and forage is grass mulato is 12 m3 for one harvest period, with fresh grass mulato production of 2.4 tons/ha.