Stage/Gage Height
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Stage, also known as gage height or water level, refers to the elevation of the water surface relative to some reference point, or datum. The zero point for the datum is usually chosen to lie below the stream bed, but any vertical reference can work. Stage can be negative if the datum is selected above the stream surface. A common way to measure stage is through use of a staff gage, essentially a vertically oriented ruler that extends throught the stream surface.
Note: gage and gauge are both considered acceptable spellings. |
 Staff gage showing stage reading of ~3.96 feet: image from www.sudburyriver.org/id16.html |
 Measuring stage with a water-level meter |
Stage is relatively quick and easy to measure by using a staff gage. Another approach is to use a water-level meter to determine the distance below the top of a stilling well. The meter a measuring tape with a open circuit at the end is lowered until reaching the water, triggering a beep and lighting an indicator. |
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Stage can also be recorded "continuously" using:
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