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North Dakota Water Science Center

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Ratings Depot Information

Stage-discharge ratings are available to agencies and other interested parties from the USGS ratings depot. The USGS ratings depot is limited to stage-discharge ratings and can be accessed at the following modified URL.

http://waterdata.usgs.gov/nwisweb/get_ratings?site_no=XXXXXXXX&file_type=exsa

where XXXXXXXX is the 8-15 digit USGS station number. You will be prompted to save the file to a user defined location.

For example, to obtain the stage-discharge rating for the Missouri River at Bismarck, use the following modified URL:

http://waterdata.usgs.gov/nwisweb/get_ratings?site_no=06342500&file_type=exsa

Note that ratings will change, sometimes frequently. Check the depot regularly to ensure that the applicable shifted rating is used for the current data. The current rating should not be used on historical data as noted by the standard disclaimer statement at the head of each rating file.

"Stage-discharge relations (ratings) are usually developed from a graphical analysis of numerous discharge measurements. Measurements are made on various schedules and sometimes for different purposes. All discharge measurements are compiled and maintained in a database. Each measurement is carefully made and undergoes quality assurance review. Some measurements indicate a temporary change in the rating, often because of a change in the streambed (for example, erosion or deposition) or growth of riparian vegetation. Such changes are called shifts; they may indicate a short- or long-term change in the rating for the gage. In normal usage, the measured shifts (or corrections) are applied mathematically to a defined rating.

The tables being provided are shift corrected, incorporating the mathematical adjustments for ease of use by the user. The shift adjustments are applied to the individual ratings as measured data become available, resulting in an adjusted rating. Some ratings may change as often as weekly, others may not change for months or years.

 

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URL: http://nd.water.usgs.gov/data/rating_depot.html
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Page Last Modified: Wednesday, 11-Feb-2015 09:23:02 EST
Sioux Falls, SD [sdww54]