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Jul 6, 2018
It was referenced that they lowered the Rhine level above:
How does one lower the water level?
And in turn how does one then Raise the level back?
Is it pumps and drains, or do they let it run of and then refill naturally.
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Aug 1, 2010
Seven Pines, Virginia
Typically at the dam, there is an outlet control structure. The main structure will have a preset opening (orifice) that maintains a normal pool elevation (water level). This structure will also have either a valve or a sluice gate. The valve opens and closes just like your bathroom faucet, but just a much larger diameter. A sluice gate is vertical barrier that can be raised or lowered to control the water level and to release excess stormwater. Sluice gates allow a lot of water to exit quickly, while a valve would take much longer. I have not seen plans for the dam and structure, but one can see the outfall channel on Google Earth. Once the water level is lowered, mother nature does a good job of refilling the reservoir.
Nov 21, 2013
I dunno, @Thomas seems to have a much more feasible explanation.
There is an overflow pipe to maintain the normal water level, this has a screen over it to prevent junk from plugging the pipe and creating an overflow that would destroy the dam. The pipe flows under the old brewery road. There is also, as mentioned, a valve that can open a lower release point in case it needs to be lowered for park maintenance.
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