Total Dissolved Gas Barometric Pressure And Water Temperature Data Lower Columbia River Oregon And Washington 2011

Author : Heather M. Bragg
Publisher :
ISBN 13 :
Total Pages : 26 pages
Book Rating : 4.:/5 (951 download)

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Download or read book Total Dissolved Gas and Water Temperature in the Lower Columbia River, Oregon and Washington, Water Year 2015 written by Heather M. Bragg and published by . This book was released on 2016 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis of total-dissolved-gas (TDG) and water-temperature data collected at eight fixed monitoring stations on the lower Columbia River in Oregon and Washington in water year 2015 indicated the following: All but 1 of the 85 TDG sensor laboratory checks that were performed after field deployment were within ±0.5-percent saturation of a primary standard. After 3-4 weeks of deployment in the river, 79 of 89 TDG sensor field checks were within ±1.0-percent saturation of a secondary standard. Nine of the field checks greater than ±1.0-percent saturation occurred at the John Day Dam tailwater station and resulted in periods of deleted TDG data at the station. All 90 barometric pressure field checks were within ±1 millimeter of mercury of a primary stand-ard, and all 90 water-temperature field checks were within ±0.2 degrees Celsius of a secondary standard. TDG data were considered complete if received in real time and within 1-percent saturation of the expected value on the basis of calibration data, replicate quality-control measurements, and comparison to river conditions at adjacent stations. For the eight monitoring stations, data completeness ranged from 71.9 to 99.8 percent. All quality-assurance values exceed the criteria established by the U.S. Army Corps of Engineers TDG monitoring plan. Criteria for data completeness (95-percent) were met at seven of the eight monitoring stations. Deleted data at the John Day tailwater station resulted in data completeness below criteria.