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| General Listing |
Title of Listing: | | MEASERR |
Category: | | Software/Models |
Subcategory: | | Government, All Listings |
Date: | | |
Document #: | | |
Web Site: | | http://water.usgs.gov/software/measerr.html |
Email: | | h2osoft@usgs.gov |
Abstract: | |
The uncertainty, or standard error, for individual measurements of stream discharge is computed based on a root-mean-square error analysis of the individual component errors. The component errors include errors in the measurement of width, depth, and velocity, and in computation procedures. The error in measurement of velocity include the uncertainties introduced by the measurement instrument, the pulsation of flow in natural rivers, the vertical distribution of measurements, and oblique flow. This error analysis can be used to evaluate the uncertainty for most discharge measurements made with the vertical axis, cup-type current meter. The procedures do not apply to other types of current meters or other methods such as dilution gauging or ultrasonic methods. A USGS study indicates that standard errors for individual discharge measurements can range from about 2 percent under ideal conditions to about 20 percent when conditions are poor and shortcut methods are used. Some conditions, such as wind, ice, boundary effects, flow obstructions, improper equipment, as well as incorrect measuring procedures and carelessness, can result in larger errors than indicated by the error analysis.
Available for download on the WWW.
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Topics
Channels/Hydrology
Additional Topics/Tags/Keywords
Free Download, Stream Discharge Uncertainty, Standard Error
Organization: | | US Geological Survey (USGS), Hydrologic Analysis Software Support Team |
Address: | | 437 National Center
| Phone: | Description | Number |
City: | | Reston | | | |
State/Province/Territory: | | VA | 2. | | |
Zip/Postal Code: | | 20192 | 3. | | |
Country: | | United States | 4. | Fax: | |
Branch Locations: | |
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