Page - 296 - in Book of Full Papers - Symposium Hydro Engineering

FIGURE 3. FLOOD 2 FEBRUARY 2016, WATER LEVEL REACH 80 CM The Evaluation of Flood 1. Flood 2004 a. The influence of Lodoyo reservoir water level in the estuary of Bogel River at the time of floods is estimated at El. +138.20 (from the analysis of non-uniform flow for discharge of 2,000 m3/s and water level in the Lodoyo weir is +136.00). b. With the same discharge conditions when the Lodoyo water level was lowered to El. 134.00, so the water level in the estuary Bogel River is +138.05. c. And when the gate fully opened, the discharge of 2,000 m3 / sec, so the Lodoyo water level +131.00 and the water level in the estuary of Bogel River is +138.05. d. Based on these conditions indicate that the water level during a flood in Bogel River not influenced by the water level in Lodoyo Weir, but is determined more by the discharge that passing through the river. 2. Flood dated January 18, 2016 and February 2, 2016 a. By two flood events that occurred on January 18, 2016 and February 2, 2016 seen on Flood Hydrograph that during heavy rainfall, water level Bogel River increase up quickly and additions are quite large. Example: In the event of flooding dated January 18, 2016 an increase of water level from +135.5 m to 138.2 m (2.7 m) within 2 hours. b. Effort to reduce the water level of Lodoyo weir already done, but require quite a long time to reduce Bogel River water level. For example on two flood events that take more than 24 hours to reduce the elevation from 1.0-1.5 m. 296