USGS Open-File Report 2013–1106 - Streamflow Characterization and Summary of Water-Quality Data Collection during the Mississippi River Flood, April through July 2011 (original) (raw)

Abstract

From April through July 2011, the U.S. Geological Survey collected surface-water samples from 69 water-quality stations and 3 flood-control structures in 4 major subbasins of the Mississippi River Basin to characterize the water quality during the 2011 Mississippi River flood. Most stations were sampled at least monthly for field parameters suspended sediment, nutrients, and selected pesticides. Samples were collected at daily to biweekly frequencies at selected sites in the case of suspended sediment. Hydro-carbon analysis was performed on samples collected at two sites in the Atchafalaya River Basin to assess the water-quality implications of opening the Morganza Floodway. Water-quality samples obtained during the flood period were collected at flows well above normal streamflow conditions at the majority of the stations throughout the Mississippi River Basin and its subbasins.

Heavy rainfall and snowmelt resulted in high streamflow in the Mississippi River Basin from April through July 2011. The Ohio River Subbasin contributed to most of the flow in the lower Mississippi-Atchafalaya River Subbasin during the months of April and May because of widespread rainfall, whereas snowmelt and precipitation from the Missouri River Subbasin and the upper Mississippi River Subbasin contributed to most of the flow in the lower Mississippi-Atchafalaya River Subbasin during June and July. Peak streamflows from the 2011 flood were higher than peak streamflow during previous historic floods at most the selected streamgages in the Mississippi River Basin. In the Missouri River Subbasin, the volume of water moved during the 1952 flood was greater than the amount move during the 2011 flood.

Median concentrations of suspended sediment and total phosphorus were higher in the Missouri River Subbasin during the flood when compared to the other three subbasins. Surface water in the upper Mississippi River Subbasin contained higher median concentrations of total nitrogen, nitrate, orthophosphate, and atrazine during the flood period.

First posted July 19, 2013

• Report PDF (11.9 MB)

All appendixes are Excel Files

• Appendix 1 (23.5 KB)
  QA/QC analysis
• Appendix 2 (120 KB)
  Field parameters and inorganic data
• Appendix 3 (85.2 KB)
  Suspended sediment, turbidity, and particle size analysis data
• Appendix 4 (68 KB)
  Nutrient data
• Appendix 5 (143 KB)
  Pesticide data
• Appendix 6 (26.1 KB)
  List of pesticides that were not detected
• Appendix 7 (15.6 KB)
  Sediment data collected from the Morganza Floodway and Bonnet Carre Spillway
• Appendix 8 (14.8 KB)
  Oil and gas data collected in the Atchafalaya River Basin

For additional information contact:
Director, USGS Mississippi Water Science Center
308 S. Airport Road
Jackson, MS 39208–6649
http://ms.water.usgs.gov//

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