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Eleanor E Hines and Wayne G Landis Regional risk assessment of the Puyallup River Watershed and the evaluation of low impact development in meeting management goals Integrated Environmental Assessment and Management 10

Article first published online: 18 FEB 2014 | DOI: 10.1002/ieam.1509

Key Points

  • The Bayesian network relative risk model (BN-RRM) estimated risk of prespawn mortality to Coho salmon in the Puyallup River watershed in a spatially explicit manner.
  • The pattern of risk was that a greater risk existed as the watershed became more urban as it transitions through National Park, agriculture, suburbs, manufacturing and eventually to the Port of Tacoma.
  • The effect of low impact development (LID) was successfully introduced into the model to examine the changes in risk. To successfully alter the pattern of risk, a substantial amount of area would have to be transferred to LID, especially in the high-risk regions of the watershed.
  • The adaptability of the BN-RRM allows for both an evaluation of risk and an examination of how management alternatives alter the risk. The fundamental approach should be applicable to other sites in Puget Sound and to other scenarios.

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