water level 
noun
The height reached by the water in a reservoir, river, storage tank, or similar.The pump is powerful enough to create a vortex in the reservoir and if the water level is too low, this vortex will reach down into the pump inlet and bubbles will be pumped through the system....
- At the Shihmen Dam in Taoyuan County, the water level yesterday reached 220m, or 31.9 percent of the reservoir's capacity.
- With the light showers, the water level improved in the tank.
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