Surface-Water Quality Conditions and Long-Term Trends at Selected Sites within the Ambient Water-Quality Monitoring Network in Missouri, Water Years 1993-2008

Barr, Miya N.; Davis, Jerri V.

doi:10.3133/sir20105078

Cited by 13 publications

(24 citation statements)

References 7 publications

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“…Gauges were instrumented with Sutron Accubar Bubble water‐level systems (Sutron Corporation) and tipping bucket rain gauges (Texas Electronics, Inc.) coupled to Satlink2 logger‐transmitters (Sutron Corporation). These gauges augmented an existing long‐term USGS network of northern Missouri streamflow gauges (Figure ), similarly instrumented, previously established as part of ongoing studies (Hooper et al ., ; Barr and Davis, ) and maintained since 1990 or before. At all sites, periodic measurements (typically every 4–6 weeks) of streamflow were used to establish and maintain stage and streamflow relationships in accordance with established protocols (Turnipseed and Sauer, ; Mueller et al ., ).…”

Section: Methodsmentioning

confidence: 99%

“…The Platte, Nodaway, Grand, Chariton and Missouri Rivers were sampled over the period January 1990 through May 2014 as part of existing programmes designed to characterize water-quality over time (Fricke and Hawkinson, 1975;Barr and Davis, 2010). In general, these sites were typically sampled monthly, although in some years, there were more or fewer samples collected because of programmatic changes.…”

Section: Study Areamentioning

confidence: 99%

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Water-Quality Assessment of the Lower Grand River Basin, Missouri and Iowa, USA, in Support of Integrated Conservation Practices

Wilkison

Armstrong

2015

River Res. Applic.

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The effectiveness of agricultural conservation programmes to adequately reduce nutrient exports to receiving streams and to help limit downstream hypoxia issues remains a concern. Quantifying programme success can be difficult given that short‐term basin changes may be masked by long‐term water‐quality shifts. We evaluated nutrient export at stream sites in the 44 months that followed a period of increased, integrated conservation implementation within the Lower Grand River Basin. These short‐term responses were then compared with export that occurred in the main stem and adjacent rivers in northern Missouri over a 22‐year period to better contextualize any recent changes. Results indicate that short‐term (October 2010 through May 2014) total nitrogen (TN) concentrations in the Grand River were 20% less than the long‐term average, and total phosphorus (TP) concentrations were 23% less. Nutrient reductions in the short term were primarily the result of the less‐than‐average precipitation and, consequently, streamflow that was 36% below normal. Therefore, nutrient concentrations measured in tributary streams were likely less than normal during the implementation period. Northern Missouri streamflow‐normalized TN concentrations remained relatively flat or declined over the period 1991 through 2013 likely because available sources of nitrogen, determined as the sum of commercial fertilizers, available animal manures and atmospheric inputs, were typically less than crop requirement for much of that time frame. Conversely, flow‐normalized stream TP concentrations increased over the past 22 years in northern Missouri streams, likely in response to many years of phosphorus inputs in excess of crop requirements. Stream nutrient changes were most pronounced during periods that coincided with the major tillage, planting and growth phases of row crops and increased streamflow. Nutrient reduction strategies targeted at the period February through June would likely have the greatest impact on reducing nutrient export from the basin. Published 2015. This article is a U.S. Government work and is in the public domain in the USA.

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Section: Methodsmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Water-Quality Assessment of the Lower Grand River Basin, Missouri and Iowa, USA, in Support of Integrated Conservation Practices

Wilkison

Armstrong

2015

River Res. Applic.

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“…The USGS, in cooperation with the MDNR, designed and operates the cooperative AWQMN, which is a series of monitoring stations on streams and springs throughout Missouri. Constituent concentration data from the AWQMN have been used to determine statewide water-quality status and long-term trends (Barr and Davis, 2010) in order to meet information needs of State agencies involved in water-quality planning and management. The data collected also provide support for the design, implementation, and evaluation of preventive and remediation programs.…”

Section: The Ambient Water-quality Monitoring Networkmentioning

confidence: 99%

Quality of surface water in Missouri, water year 2009

Barr¹

2010

Open-File Report

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Cover photos. U.S. Geological Survey personnel: 1, operating a motorized boat to a site location. 2, measuring streamflow with ADCP. 3, processing fecal indicator bacteria samples. 4, measuring physical properties at site. 5, collecting streambed sediments. 6, analyzing alkalinity of a surface water-quality sample. 7, collecting a surface water-quality sample using EWI-methods. 8. boat with a sampling crane used to collect surface water-quality samples on large rivers. 9, recording field conditions at site. 10, sampling crane on boat near St. Louis, Missouri. 11, removing sample from D-96 on boat deck. 12, measuring streamflow with StreamPro.

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“…Constituent concentration data from the AWQMN have been used to determine statewide water-quality status and long-term trends for a 15-year period (Barr and Davis, 2010) to meet information needs of State agencies involved in water-quality planning and management. The data collected also provide support for the design, implementation, and evaluation of preventive and remediation programs.…”

Section: The Ambient Water-quality Monitoring Networkmentioning

confidence: 99%