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Historic (pre-2007) gage-height data may contain erroneous values, such as pressure sensors encased in ice, even if they are flagged as approved. These data are made available to the public, but data users are cautioned to carefully screen the data and contact the USGS Kansas Water Science Center if they have questions or concerns about specific values.
** During winter months the realtime streamflow displayed may not reflect the true discharge for periods when ice forms in the stream. When ice forms, the river cross-section is constricted and produces a higher river stage for any given amount of discharge that exists during ice-free periods. This condition is known as backwater. Although accurate themselves, the river stages can no longer be used to accurately and directly compute discharge from the rating curve (which relates stage to discharge) because the amount of backwater varies with time, temperature, and other factors. More complex procedures that require the use of meteorological and hydrological data from other stations in the area must be used to determine discharge at the affected stations. Unfortunately, these more complex procedures cannot yet be applied in real time. Additional, ice forming in the channel can result in erroneous readings as the instrumentation in the stream is adversely affected by the ice generally resulting in an erroneously higher stage reading. While every attempt is made to screen erroneous data from the realtime display, this data is considered provisional and should be used with caution.
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