Merapi mountain is one of the few volcanoes in Indonesia that are classified as very active. Merapi mountain eruption that occurred in 2010, resulting in cold lava flows and floods carrying a volume of material reaching 150 million m3 spread over the rivers that head on Mount Merapi. River code is one of the rivers that originated from Mount Merapi and also a watershed (DAS) which is 18 km long, the flow of water at this time could be a potential flood in case of heavy rains with high intensity, especially if it occurs after the eruption of the mountain fire occurs. With more and more events in the city of Yogyakarta caused by the change in the rate of infiltration caused by sedimentation of the volcanic eruption ash. The study was conducted to determine the rate of infiltration using doublering infiltrometer with the location of the research spread at 8 points in the river code.The results of this study were tested at 8 different points which concluded that point 1 was the largest infiltration capacity point compared to other tick points of 8.69 cm / h, located at Ngepring, Purwobinangun, Pakem, Sleman District DIY