0 a passage for extra water from a lake created by a dam (= a wall built across a river to hold back water):
The dam's main spillway isn't large enough to pass a lot of water in a big storm.
More water is needed to flush young salmon through dam spillways.
A system of reservoirs was constructed near large building complexes, and a low-gradient, shallow spillway canal drained excess water without depleting the water storage.
Areas that must be addressed include: hydrological and geological considerations; river diversion; hydraulic characteristics; storage; spillway requirements; turbomachinery, generator sets, and transmission; and more definitive modelling of the waterretaining structures.
My feeling is that millions of gallons are going to waste over the spillways of these dams on frequent occasions during wet weather.
The structures have included intakes, sluices, spillways and stilling basins.
An 146.6 million upgrade of facilities commenced in 2009 and resulted in the construction of two spillways and three saddle dams, completed during 2011.
