Storage-Yield-Resilience-Reliability Relationship of Mun Bon Reservoir

The objective of this study was to identify the relationship among storage, yield, resilience and reliability of Mun Bon reservoir that illustrated the state and the behavior of water supply system in the various operations. The reservoir performance indicator was evaluated by using the concept of resilience and reliability. The annual hydrological data of Mun Bon Reservoir in Nakhon Ratchasima such as rainfall inflow, evaporation and seepage during 1952-1999 were used in this study, and the annual water demand data of various activities. This study defined the performance index (m) of 0.00, 0.25, 0.50, 0.75 and 1.00 that denoted the water demand of 100%, 87%, 74%, 60% and 47% of the total water demand at the real time respectively. The result showed that the reservoir operation under the index m of 0.25 gave the highest reliability of 86.03% when compared with the reliability of 67.53% at the index m of 0.00 in the present operation practice of Mun Bon reservoir. The reliability of the system was 51.20-82.24% when operated under the index m between 0.50-1.00. Consequently, this study indicated that the risk of failure for Mun Bon reservoir operation was 32.47% because the inflow was higher than the available reservoir space therefore the spillage event usually would occur. The operation of Mun Bon reservoir should be improved in order to meet the allowable reliability in water management.