Upaya Pengendalian Banjir Kawasan Sub-Das Celeng Pra Pembangunan Embung Imogiri

Flood on March 17 in the Celeng River, Wukirsari Village, D.I. Yogyakarta became biggest flood that ever happened Bog River. Floods are caused by heavy flow of water from hills Imogiri and Dlingo areas. The River overflowed submerged four hamlets District. This study aims to determine control efforts sub-watershed area. research location is Kali sub-watershed, Wukirsari, Imogiri, with point located lower reaches right at confluence Oyo hydrological analysis was calculated using Gamma 1 unit hydrograph method a return period 10 years. maximum discharges for each sub-watersheds 75.73 m3/s, 38.22 37.20 18.54 21.57 26.29 while 10-year watershed 959.60 m3/s. hydraulic carried out modeling 13.35 km long channel HEC-RAS 4.1 software. simulation steadily. results show during existing state there several points section overflow. overflowing sections then normalized certain groove dimensions adjusted point. after normalization most can accommodate discharge occurred. still overflow given embankments an average height 0.75 m.