Hydromod Tools Eric Stein

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Hydromod Tools Eric Stein

  1. 1. Developing Tools for Hydromodification Management and Assessment Eric Stein S. Ca. Coastal Water Research Project (SCCWRP) [email_address]
  2. 2. Today’s Presentation <ul><li>Project Overview </li></ul><ul><li>General Study Approach </li></ul><ul><li>Tool development </li></ul><ul><li>Expected Products </li></ul><ul><li>Status </li></ul>
  3. 3. Effect of Increased Impervious Cover Hydromodification
  4. 4. Effects of Hydromodification
  5. 5. Regional Issue  Regional Approach <ul><li>Relationship between increased impervious cover and stream stability is a regional concern </li></ul><ul><li>Build on previous work: </li></ul><ul><ul><li>Stormwater Monitoring Coalition (SMC) </li></ul></ul><ul><ul><li>Santa Clara County </li></ul></ul><ul><ul><li>Contra Costa County </li></ul></ul>
  6. 6. Prior Study Approaches <ul><li>Compare historic and contemporary channel shape and size to changes in impervious cover </li></ul><ul><li>Use relationship between changes in channel stability and changes in impervious cover to determine expected responses in S. Ca. streams </li></ul><ul><li>Modeling studies in SF Bay area counties </li></ul><ul><ul><li>Long-term hydrologic simulations </li></ul></ul><ul><ul><li>Risk-based modeling </li></ul></ul>
  7. 7. Major Conclusions <ul><li>Southern Ca. streams appear to be more sensitive to changes in impervious cover than streams in other areas of the country </li></ul><ul><ul><li>Estimated threshold of response ≈ 5% TIMP </li></ul></ul><ul><li>All streams studied are adjusting to flow conditions on an annual basis </li></ul><ul><ul><li>All streams undergo constant change and adjustment </li></ul></ul><ul><ul><li>Rate of change differs between natural and developed areas </li></ul></ul><ul><li>Management approaches will differ depending on stream type, drainage area and amount of impervious cover </li></ul><ul><li>SCCWRP Technical Reports #450 and #475 – www.sccwrp.org </li></ul>
  8. 8. Conclusions of Past Studies Empirical Analysis (S. Ca.)
  9. 9. Conclusions of Past Studies Empirical Analysis (S. Ca.) Logistic Regression (Modeling) (S.F. Bay Area)
  10. 10. Current Study <ul><li>Joint project between SCCWRP and Colorado State Univ. </li></ul><ul><ul><li>Based on results of 2005 workshop </li></ul></ul><ul><ul><li>Funded by Proposition 50 </li></ul></ul><ul><li>Which streams are at the greatest risk of effects of hydromodification? </li></ul><ul><li>What are the anticipated effects in terms of increased erosion, sedimentation, or habitat loss, associated with increases in impervious cover? </li></ul><ul><li>What are some potential management measures that could be implemented to offset hydromodification effects? </li></ul>
  11. 11. Major Tasks <ul><li>Develop protocols for mapping and classification </li></ul><ul><ul><li>Susceptibility evaluation </li></ul></ul><ul><li>Develop protocols for monitoring and assessment </li></ul><ul><ul><li>Additional data for model development </li></ul></ul><ul><li>Develop and calibrate predictive models </li></ul><ul><li>Develop management tools </li></ul>
  12. 12. Preliminary Study Sites Data to support : - Development of screening tool - Calibration of predictive models - Development of standard monitoring protocols
  13. 13. Expected Products <ul><li>Screening tool – evaluate whether or not a project is likely to be of concern for hydromodification </li></ul><ul><ul><li>Checklists </li></ul></ul><ul><li>Effects tools –evaluate the expected magnitude or intensity of effect </li></ul><ul><ul><li>Models, decision tree, nomograph or plots </li></ul></ul><ul><li>Mitigation tools –guide recommended mitigation and management measures. </li></ul><ul><ul><li>fact sheets, design criteria, sizing standards </li></ul></ul>
  14. 14. Screening Tool <ul><li>Not all streams are the same </li></ul><ul><li>Level of concern & appropriate management strategy will differ based on: </li></ul><ul><ul><li>Condition of stream </li></ul></ul><ul><ul><li>Condition of catchment </li></ul></ul><ul><ul><li>Anticipated change in land use/runoff </li></ul></ul><ul><ul><li>Existing control/management measures </li></ul></ul><ul><ul><li>Proposed management measures </li></ul></ul><ul><li>Tool to help prioritize level of effort/attention </li></ul><ul><ul><li>Checklist, decision tree, etc. </li></ul></ul>
  15. 15. Elements of Screening Tool <ul><li>Intrinsic Channel Properties </li></ul><ul><li>Catchment Characteristics </li></ul><ul><li>Existing Infrastructure </li></ul>
  16. 16. Different Goals for Different Stages <ul><li>Protect </li></ul><ul><ul><li>manage runoff </li></ul></ul><ul><ul><li>buffer stream </li></ul></ul><ul><li>Restore </li></ul><ul><ul><li>stabilize </li></ul></ul><ul><ul><li>recontour </li></ul></ul><ul><li>Manage for New Condition </li></ul><ul><ul><li>alternate stream type </li></ul></ul>
  17. 17. Modeling Tool <ul><li>Channels are dynamic, vary over multiple time scales </li></ul><ul><li>Goal is to understand long-term “equilibrium” condition after proposed land use change </li></ul><ul><ul><li>Ultimate target period beyond most typical monitoring </li></ul></ul><ul><li>Need to “translate” model results into simple to use tools for planners & managers </li></ul><ul><ul><li>Nomographs, plots, tables </li></ul></ul>
  18. 18. Working Hypotheses <ul><li>Urbanization & increased imperviousness shift the natural delivery of water and sediment to a water course, increasing the risk of incision, widening, and general instability  change in channel form </li></ul>Class III Class II Class IV Class V Class I Class V Class II Class III Class I Class Ia Class IV
  19. 19. Interaction of Models
  20. 20. Mitigation Tool <ul><li>Management response will vary based on: </li></ul><ul><ul><li>Existing channel condition </li></ul></ul><ul><ul><li>Proposed change in land use, runoff </li></ul></ul><ul><li>Need to select appropriate management actions: </li></ul><ul><ul><li>On site runoff control </li></ul></ul><ul><ul><li>Stream channel buffering </li></ul></ul><ul><ul><li>Floodplain restoration </li></ul></ul><ul><ul><li>Structural control </li></ul></ul><ul><ul><li>Manage for new “equalibrium” condition </li></ul></ul><ul><li>Decision tools for managers, planners, etc </li></ul><ul><ul><li>Fact sheets, decision trees, tables </li></ul></ul>
  21. 21. What is Appropriate Management Response? Hasley Canyon Wash
  22. 22. Next Steps <ul><li>Site selection completed </li></ul><ul><li>Field data collection – Summer 2007 </li></ul><ul><li>Produce draft protocols & monitoring recs. – Fall 2007 </li></ul><ul><li>Produce draft screening tools – Spring 2008 </li></ul><ul><li>Modeling – 2009 </li></ul><ul><li>Final Products – Winter 2010 </li></ul>
  23. 23. Questions? Eric Stein 714-755-3233 [email_address]

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