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   <subfield code="a">Soil and water assessment tool :</subfield>
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   <subfield code="c">S. L. Neitsch [et al.] ...</subfield>
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   <subfield code="a">The document is a graphical user interface for the SWAT (Soil and Water Assessment Tool) model (Arnoil et al. 1998). SWAT is a river basin or watershed, scale model developed to predict the impact of land management practices on water, sediment and agricultural chemical yields  in large, complex watersheds with varying soils, land use, and management conditions over long periods of time.</subfield>
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