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Gunungkidul Regency is an area that has both potential and problems in achieving food stability. Though agriculture in this region makes the highest contribution to Gross Regional Domestic Product, the productivity of this sector is still low. Drought is a classic problem and represents the largest barrier in agricultural development, despite high precipitation. This paper describes the design of an efficient irrigation technology to increase agricultural productivity. Specifically, this research aims to determine marginal-land suitability, analyze and design a suitable model of rainwater-harvesting-based irrigation technology. Using the method of combining field study and desktop analysis, the results indicate that the land in the research site is considered suitable given the conditions of a particular treatment for the commodities of upland rice, soybean, corn, green beans, peanuts and cassava. The model rainwater irrigation reservoir is built by considering the drainage flow and the contour of the rainwater catchment area. The feasible irrigation distribution models are the pitcher irrigation system and perforated pipe irrigation system. The pitcher system from the existing reservoir can support a maximum of 24.75 m 2 of land, 120 plants and at least 66 service days. The optimum range of pitcher water is around 25 cm with a 50-cm space between plants and one pitcher serving 4 plants. Meanwhile, the perforated pipe is mounted near the root zone (10 - 25 cm) at the depth of 17.5 cm, with 25 cm left-right spacing between plants. An L-shaped pipe can serve 10 plants; one side is mounted underground while the other side is above the land surface for water intake. The pipe system from a reservoir can serve a maximum of 129.5 m 2 land. The study results lead to the conclusion that the most suitable irrigation model in the study area is the perforated pipe system.

Rainwater Harvesting-Based Marginal Land Irrigation Technology: A Case Study in Ngawen Sub-district of Gunungkidul Regency, Indonesia