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NUTRIENT SOURCES AND TRANSPORT

SPARROW models provide an efficient regional assessment. SPARROW-model results can increase understanding of nutrient transport, load distributions, and relative effects of various nutrient sources in large watersheds. Nitrogen-model results for the Connecticut River Basin serve as an example of how the model can be used to estimate the total-nitrogen contribution to Long Island Sound from any location in the entire basin.

Thumbnail image of nitrogen loads leaving New Hampshire and Vermont via the Connecticut River (text description to the right)
(Click for enlarged image)

SPARROW results indicate that 41 percent of the nitrogen load entering Long Island Sound originated upstream of the point where the Connecticut River leaves New Hampshire and Vermont. Of that nitrogen load leaving New Hampshire and Vermont,
- 06 percent is from developed land,
- 11 percent is from municipal wastewater-treatment facilities,
- 20 percent is from agricultural lands, and
- 63 percent is from atmospheric deposition.

 

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Page Last Modified: Thursday, May 21, 2009