Page - 294 - in Book of Full Papers - Symposium Hydro Engineering

METHODOLOGY Discussion in this paper generally consists of two subjects. The first part discusses the flood problem of Bogel River. This is done by studying the secondary data available, the results of previous studies, collecting and analysis of primary data in the field. The second section discusses the planning and solution in order to mitigation and overcome the flood problem of Bogel River. The method used is as follows : 1. Arrange the evaluation for historical flood that ever happened 2. Direct controlling by operating the Lodoyo weir according to Dam Operational Guidelines, Procedures and Work Instructions of Flood Control 3. Arrange the concept of the proposed for flood mitigation that includes : a. Make the comprehensive study of flood mitigation b. Short Term Action 2016 c. Middle Term-Long Term Action 4. Completing the hydrology observation instruments in Bogel River System RESULTS AND DISCUSSION THE FLOOD PROBLEM OF BOGEL RIVER - SUTOJAYAN Flood in Sutojayan is a complex problem caused by several factors: 1. Watershed is relatively gentle slopes and even tend to be flat 2. Condition of land in the catchment area is in a critical / deforested so the potential of sedimentation is huge 3. There was silting in most of the tributaries upstream because of erosion and sedimentation 4. Areas that frequent flooding is in the district Sutojayan due to the topography of the area is a basin which is lower than the elevation of the water level of Bogel River 5. The number of irrigation dams in the upstream impede the flow of water during a flood. Moreover, the condition is also full of sediment (sedimented) Based on the information in the field floods that hit several villages in the district Sutojayan actually a regular puddle on every rainy season. This is because the area in the region is lower than the elevation of the water level of Bogel River, so the drainage can not drain the water into the river. Historical Events Flood of 2004 that ever happened 1. Chronology Flood of 2004 a. Rain drops began on December 2, 2004 at 07.00 am with cumulative rainfall in some places very high: 441 mm Tunggorono, Bhirowo 371 mm, 366 mm Wlingi. 294