Derived power production and energy drawdown rules for reservoir

Theoretical hydropower operation rules are derived and discussed for reserv oirs in parallel, in series, and single reservoirs for cases where reservoi rs typically refill before they empty and for parallel reservoirs when rese rvoirs are expected to draw down to empty. These hydropower rules offer a s implified economic basis for allocating storage and energy in multireservoi r hydropower systems. The approach is demonstrated for an illustrative exam ple and should be helpful for making decisions regarding hydropower release s over time, subject to the limited conditions under which these rules hold .