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Environmental Water-Quality Zones for Streams: A Regional Classification Scheme

Author

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  • DALE M. ROBERTSON

    (US Geological Survey, 8505 Research Way, Middleton, Wisconsin 53562, USA)

  • DAVID A. SAAD

    (US Geological Survey, 8505 Research Way, Middleton, Wisconsin 53562, USA)

Abstract

Various approaches have been used to classify large geographical areas into smaller regions of similar water quality or extrapolate water-quality data from a few streams to other unmonitored streams. A combination of some of the strengths of existing techniques is used to develop a new approach for these purposes. In this new approach, referred to here as SPARTA (SPAtial Regression-Tree Analysis), environmental characteristics for each monitored stream are first quantified using a Geographic Information System (GIS) and then regression-tree analysis is used to determine which characteristics are most statistically important in describing the distribution of a specific water-quality constituent. GIS coverages of only the most statistically significant environmental characteristics are then used to subdivide the area of interest into relatively homogeneous environmental water-quality zones. Results from the regression-tree analysis not only define the most important environmental characteristics, but also describe how to subdivide the coverage of the specific characteristic (for example, areas with

Suggested Citation

  • Dale M. Robertson & David A. Saad, 2003. "Environmental Water-Quality Zones for Streams: A Regional Classification Scheme," Environmental Management, Springer, vol. 31(5), pages 0581-0602, May.
    • Handle: RePEc:spr:envman:v:31:y:2003:i:5:d:10.1007_s00267-002-2955-5
    DOI: 10.1007/s00267-002-2955-5
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