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Explaining Flood Measurements

Information presented is factual at the time of creation.
If no transcript and/or closed-caption is available, please notify us.
Speaker: The United States Geological Survey collects stage data at rivers and streams in Arizona. The stage data collected by the stream gauge is converted to discharge by a mathematical formula called radium after the data is transmitted to the office.



Because channel or stream bed conditions change during flow events, personnel maintaining the gauges are required to make discharge measurements to calibrate the rating. Calibrating the rating makes the overall discharge more accurate.



The discharge measurements are represented by the asterisk on the hydrograph to the left of the screen.



Personnel use different techniques to measure discharge depending on the amount of flow, as shown on the video to the right.



At higher flows, a bridge board is used whereas at lower flows, the measurement is made by wading the channel.

Details

Title: Explaining Flood Measurements

Description: Explaning why USGS streamgagers make discharge measurements.

Location: AZ, USA

Date Taken: 3/22/2010

Length: 0:00

Video Producer: U.S. Geological Survey


Note: This video has been released into the public domain by the U.S. Geological Survey for use in its entirety. Some videos may contain pieces of copyrighted material. If you wish to use a portion of the video for any purpose, other than for resharing/reposting the video in its entirety, please contact the Video Producer/Videographer listed with this video. Please refer to the USGS Copyright section for how to credit this video.

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Floods (Set) RSS Media RSS Hurricane Odile, AZ Flooding September 2014, USGS at Work Ice breakup at South Fork Grand River near Cash, SD
In: Natural Hazards collection

Tags: FieldWork floods hazards measurement water

 

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