File:May et al 1997 urbanization of small streams.pdf

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May 1997.jpg

May, Christopher W; Horner, Richard R; Karr, James R; Mar, Brian W; Welch, Eugene B. 1999. Effects Of Urbanization On Small Streams in the Puget Sound Ecoregion. Watershed Protection Techniques 2.4, pp 79-90.


  • Salmon have disappeared from 40% of historical range (Nehlsen et al 1991)
  • Previous studies suggest that 10% Total Impervious Area is the level at which stream and wetland degradation begins.
  • "The typical suburban development in the PNW has been estimated to have roughly 90% less storage capacity than under naturally forested conditions (Wigmosta et al. 1994)."
  • "Analysis demonstrated that the relationships to be discussed were very similar if development is alternatively expressed as road-density (Figure 3). This is especially relevant in that the transportation component of imperviousness often exceeds the "rooftop" component in many land-use categories (Schueler 1994). A recent study in the Puget Sound region has shown that the transportation component typical accounts for over 60% of basin imperviousness in suburban areas (City of Olympia 1994).

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current15:21, 18 October 2016 (269 KB)Pcereghino (talk | contribs)

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