March 25, 2021
By:
Walter G. Wright
Category:
Arkansas Environmental, Energy, and Water Law
Arkansas Environmental, Energy, and Water Law
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A USGS study has been released titled:
Nitrogen and Phosphorus Sources and Delivery from the Mississippi/Atchafalaya River Basin: An Update Using 2012 SPARROW Models (“Study”)
The authors of the Study are Dale M. Robertson and David A. Saad.
The Study calculates total nitrogen and total phosphorus from catchments in the Mississippi/Atchafalaya River Basin (“MARB”). Both nitrogen and phosphorus originating in the MARB have been determined to be related to hypoxia and water quality issues in the Gulf of Mexico.
The Study addresses:
- Locations of nutrient sources within the MARB
- Relative importance in the MARB of different nutrient sources such as:
- Fertilizer
- Manure
- Wastewater treatment plants
- Atmospheric deposition
The Study utilized what it described as “refined” SPARROW model to address these questions. The SPARROW models are stated to have been developed with:
- Higher resolution basin delineation
- Updated (2012) source inputs
- Improved calibration (load) targets
- Additional statistical techniques than used in previous SPARROW models
A copy of the Study can be downloaded here.
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