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www.reference.com/science/floods-measured-80af2d3324464992

During times of flooding, they measure how high the water has risen above the gauges to determine flood levels. There are several types of stream gauges used to measure floods. As of 2014, the most common device is a stilling well, which consists of a hole dug next to a river, and the hole has a float in it.

en.wikipedia.org/wiki/Flood_stage

Flood stage is the water level, as read by a stream gauge or tide gauge, for a body of water at a particular location, measured from the level at which a body of water threatens lives, property, commerce, or travel. The term "at flood stage" is commonly used to describe the point at which this occurs.

slate.com/news-and-politics/2010/05/how-do-you-measure-a-flood.html

The point at which water levels pose a risk to lives, homes, or commercial activity varies from place to place, so each site has its own set of action and flood stage water levels.

restorationmasterfinder.com/restoration/how-are-floods-measured

How Floods are Measured. When the NWS reports flood warnings, they measure the overall water line of the river, marking specific points as “stages.” While these stages will vary upon normal elevations above sea level of different locations, the measurements are converted into hazard levels if they reach specific elevations. ...

en.wikipedia.org/wiki/Flood

A flood is an overflow of water that submerges land that is usually dry. In the sense of "flowing water", the word may also be applied to the inflow of the tide.Floods are an area of study of the discipline hydrology and are of significant concern in agriculture, civil engineering and public health.. Flooding may occur as an overflow of water from water bodies, such as a river, lake, or ...

www.answers.com/Q/How_was_the_height_of_the_flood_water_measured

Floods are measured by the height the waters reach. They are Detected my using "Gages" they are forecasted by gathering all the data and putting it into one big piece of information.

sciencing.com/measure-intensity-flood-7967370.html

Gages at those sites measure "gage-height," a term that refers to the height of water in a stream. These gages enable the agency monitor waterways and warn people about dangerous flooding that can occur. After a flood occurs, they also help the flood investigators determine a flood's peak height.

www.answers.com/Q/How_are_flood_measured_detected_or_forecast

Floods are measured by the height the waters reach. They are Detected my using "Gages" they are forecasted by gathering all the data and putting it into one big piece of information.

www.usgs.gov/centers/cm-water/science/iowa-flood-information

Often working in dangerous conditions, USGS scientists measure streamflow and river levels, repair and install streamgages, measure water quality and changes in sediment flow, and assess river changes. From flood forecasts to difficult decisions about flood management, science is critical for flood preparations and response. (September 1, 2011)

www.usgs.gov/special-topic/water-science-school/science/how-streamflow-measured

The depth of the water is also measured at each point. These velocity and depth measurements are used to compute the total volume of water flowing past the line during a specific interval of time. Usually a river or stream will be measured at 25 to 30 regularly spaced locations across the river or stream.