Abstract:
A guideline for operating the reservoir during flood events was developed in the form of a series of graphs showing (a) the relationship between peak inflow discharges with the outflow rates for various initial water levels in the reservoir, and the operation of spillway structures, (b) graphs showing times taken to lower reservoir water levels, and (c) graphical relationship between peak flow rates at some upstream gauging station and the peak inflow rates into the reservoir, to be used as a tool to assist reservoir operators. The proposed procedure was tested, using year 2002 flood event of Pasak Reservoir and year 1995 flood event of Sirikit Reservoir as study cases. The results obtained were favorable, in which the outflow rates and the water levels in both reservoirs could be reduced more than those in the actual operations. Thus, it was confident that the procedures could be applied equally well to other small to medium sized reservoirs.