NDLI: Modeling nitrate-nitrogen load reduction strategies for the Des Moines River, Iowa using SWAT.

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Modeling nitrate-nitrogen load reduction strategies for the Des Moines River, Iowa using SWAT.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Schilling, Keith E. Wolter, Calvin F.
Spatial Coverage	Iowa
Description	Country affiliation: United States Author Affiliation: Schilling KE ( Iowa Geological and Water Survey, Iowa City, 52242, USA. kschilling@igsb.uiowa.edu)
Abstract	The Des Moines River that drains a watershed of 16,175 km(2) in portions of Iowa and Minnesota is impaired for nitrate-nitrogen (nitrate) due to concentrations that exceed regulatory limits for public water supplies. The Soil Water Assessment Tool (SWAT) model was used to model streamflow and nitrate loads and evaluate a suite of basin-wide changes and targeting configurations to potentially reduce nitrate loads in the river. The SWAT model comprised 173 subbasins and 2,516 hydrologic response units and included point and nonpoint nitrogen sources. The model was calibrated for an 11-year period and three basin-wide and four targeting strategies were evaluated. Results indicated that nonpoint sources accounted for 95% of the total nitrate export. Reduction in fertilizer applications from 170 to 50 kg/ha achieved the 38% reduction in nitrate loads, exceeding the 34% reduction required. In terms of targeting, the most efficient load reductions occurred when fertilizer applications were reduced in subbasins nearest the watershed outlet. The greatest load reduction for the area of land treated was associated with reducing loads from 55 subbasins with the highest nitrate loads, achieving a 14% reduction in nitrate loads achieved by reducing applications on 30% of the land area. SWAT model results provide much needed guidance on how to begin implementing load reduction strategies most efficiently in the Des Moines River watershed.
File Format	HTM / HTML
ISSN	0364152X
Issue Number	4
Volume Number	44
e-ISSN	14321009
Journal	Environmental Management
Language	English
Publisher	Springer
Publisher Date	2009-10-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Health Models, Theoretical Nitrates Analysis Nitrogen Water Pollutants Water Pollution Prevention & Control Fertilizers Iowa Rivers Water Movements Water Supply Journal Article
Content Type	Text
Resource Type	Article
Subject	Ecology Pollution Global and Planetary Change

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