Page - 270 - in Book of Full Papers - Symposium Hydro Engineering

Figure 1 Location of cascade reservoirs and hydrological stations Among the three hydrological stations, the 2nd hydrological station is the nearest one to all the four reservoirs. From total 49-year observations in 2nd hydrological station, the hydrograph with maximum flood peak and volume is abstracted as typical hydrograph which determine the shape of inflow flood and used to generate 40000 inflow flood processes into each reservoir. 3.4. FLOOD REGULATION AND PROBABILITY STATISTICS Based on the 40000 inflow flood processes into each reservoir, according to relationships of stage versus capacity, stage versus discharge, following specific regulation, from a certain initial stage (such as normal storage level or full supply level or top level of flood control), 40000 maximum stages for every reservoir are calculated after flood regulation. The probabilities of not exceeding initial stage, exceeding stage of check flood level and overtopping are acquired. 4. RESULT AND ANALYSIS 4.1. RESULTS The probabilities under several scenarios for each reservoir are calculated 270