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Gage height refers to the elevation of the water surface in the specific pool at the streamgaging station, not along the entire stream. Gage height also does not refer to the depth of the stream. Measurements of gage height are continually recorded by equipment inside a gagehouse on the streambank. Streamflow (also known as discharge) is the ...
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- Why We Use Gage Height
- Why Doesn’T USGS Measure Gage Height from The Bottom of The Stream?
- Why Gage Height Matters
Making Water Data Easier to Understand
On USGS water monitoring location pages, the default parameter that isdisplayed for streamgage sites isgage height. Other measures like streamflow are still available andeasily accessed with just one click. Gage height is the distance (orheight) of the water surface above the streamgage datum reference point.Gage datumis a unique reference point to each gage site and isgenerally located underneath the streambed to accommodate for streamchannel changes.
Gage Height to Describe Water Quantity
Based on user feedback, we updated ourstreamgagemonitoring location pages so gage height is the first parameter userssee on hydrographs. Users often understand what water height measurements mean to them; theyknow how gage height relates to benchmarks and landmarks in their area.Additional measures of water quantity, such as discharge are stillavailable on the monitoring location pages. Discharge, which issometimes called streamflow or water flow, is defined as the rate atwhich a volume of wa...
What Exactly is Gage Height?
Gage height is the distance (or height) of the stream (or lake)water surface above the gage datum (reference point). Read about thehistory of stream gages in this interactivepost.The gage datum is a uniquely selected reference point for eachgage site.Most of the time, it is picked to be below the lowestanticipated depth of a stream or lake because streambeds change overtime. At some locations, particularly those near the ocean, thisarbitrary reference point may be picked to be at sea level.
Gage Datum – The Reference Point
Streams are like living things and are constantly changing. Sometimesstreams erode, becoming deeper while other times streams depositsediment, becoming shallower. To understand how those changes can affectstreamflow, we need to measure from a reference point that does notchange over time, which is why gage datums are chosen to be below thebase of a streambed.
Complex Math to Estimate Discharge
Complex math is used to compute the relation between gage height anddischarge. It is easier to continuously measure the height of water thana volume of water passing by a point, so gage height is the parameterthat is reported continuously and is used to compute the relateddischarge.Another reason that gage datums are picked to be below streambeds isrelated to the mathematical computations that relate gage height todischarge.
Faster Insights Into Flooding
Gage height is used in computer models and forecasts, including floodinundation maps and flood forecasts. Floodstage,officially defined by the National WeatherService, can be thought of as the stage (orgage height) at which overflow of the natural banks of a stream beginsto cause damage in the local area from flooding. The National WeatherService uses gage height numbers to tell the public about differentlevels of flooding hazard. Therefore, gage height values are commonlyunderstood by water...
Real-time Response to Changing Gage Heights
Users can receive personalWaterAlertsif a gage heightexceeds a threshold of their choosing. Users can choose to use a gageheight they are familiar with for their alert so they can respondquickly to changing water conditions. For example, a rancher may chooseto be notified when the stream by their property exceeds a nearby gageheight of 5.2 feet, so that they know it may be time to move theirlivestock farther from the river. A homeowner may choose to be notifiedwhen a gage height exceeds a cer...
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Active. By Water Resources Mission Area March 3, 2019. Overview. Science. Multimedia. Publications. Web Tools. FAQ. A streamgage is a structure installed beside a stream or river that contains equipment that measures and records the water level (called gage height or stage) of the stream.
The chart below can be used to determine the equivalent sheet thickness, in inches or millimeters, for a gauge number from the selected gauge size standard. The weight per unit area of the sheet can also be seen in pounds per square foot and kilograms per square meter.
