Restoration Potential Model Nearc 2008 30min

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  • Restoration Potential Model Nearc 2008 30min

    1. 1. Restoration Potential Model Chris Leuchtenburg Massachusetts Riverways Program A statewide GIS Model to assess potential stream restoration projects at dam sites.
    2. 2. Agenda <ul><li>Objectives </li></ul><ul><li>Two Approaches </li></ul><ul><ul><li>Watershed Analyst </li></ul></ul><ul><ul><li>ArcHydro </li></ul></ul><ul><li>Quality Issues and Control </li></ul><ul><li>Use of the Model </li></ul>
    3. 3. “ There’s not one thing any of us in resource management can do that will restore fish and aquatic habitat faster than removing a dam.” John Nelson, Fisheries Biologist
    4. 4. Dam Impoundments are not Lakes Dam Failure Risk To Habitat
    5. 5. More than 3,000 Dams Where to start? Which dams to visit first? How to communicate about stream restoration? How to motivate advocates? How to evaluate restoration projects? What data will support funding proposals? How to measure results?
    6. 6. Environmental Impacts Model <ul><li>Fragmentation – upstream river length that would be opened if dam removed </li></ul><ul><li>Inundation – length of former river habitat currently in impoundment </li></ul><ul><li>Degradation – hydrologic residence time </li></ul>
    7. 7. Limited Results <ul><li>Incomplete and inaccurate dams data </li></ul><ul><li>Data extent limited to Massachusetts </li></ul><ul><li>Routed Stream Centerline data unavailable for 5 Major Watersheds </li></ul><ul><li>Unsupported, old software tools (Watershed Analyst, ArcView 3.x) </li></ul><ul><li>Able to fully model 53% of 3,008 dams with this approach </li></ul><ul><li>Cumbersome, mistake prone process </li></ul>
    8. 8. New Approach <ul><li>Extended beyond state boundaries </li></ul><ul><ul><li>Replaced Watershed Analyst with ArcHydro </li></ul></ul><ul><ul><li>Replaced incomplete Routed Centerlines data with MA and USGS (NHD) stream centerlines </li></ul></ul><ul><ul><li>Supplemented MassGIS elevation data with USGS data. </li></ul></ul><ul><ul><li>Obtained data from neighboring states </li></ul></ul><ul><li>ArcHydro software reduced watershed delineation mistakes. </li></ul><ul><li>Automated procedure with ArcGIS Modelbuilder </li></ul><ul><ul><li>Reduced errors </li></ul></ul><ul><ul><li>Ensure consistency </li></ul></ul><ul><ul><li>Accurate documentation </li></ul></ul><ul><ul><li>Enable ‘what if’ changes in scoring </li></ul></ul><ul><ul><li>Enable rerun as data improves </li></ul></ul><ul><li>Expanded Metrics </li></ul><ul><ul><li>Incorporated additional data </li></ul></ul><ul><ul><li>More focus on aquatic habitats </li></ul></ul>
    9. 9. Procedure <ul><li>Obtain and process input data </li></ul><ul><li>Delineate watersheds and subwatersheds for dams </li></ul><ul><ul><li>By Major Watershed </li></ul></ul><ul><ul><li>ArcHydro extension to ArcGIS </li></ul></ul><ul><li>Three sets of statewide ModelBuilder models </li></ul><ul><ul><li>Data Management </li></ul></ul><ul><ul><li>Geoprocessing </li></ul></ul><ul><ul><li>Scoring </li></ul></ul><ul><li>Quality Assessment </li></ul>
    10. 10. Data Sources <ul><li>Dams : ODS and four neighboring states </li></ul><ul><li>Elevation : MassGIS and USGS (NED) </li></ul><ul><li>Centerlines : DFG and USGS (NHD) </li></ul><ul><li>Roads : EOT and four neighboring states </li></ul><ul><li>Living Waters : NHESP </li></ul><ul><li>Coldwater Streams : DFG </li></ul>
    11. 11. Restoration Benefit Factors <ul><li>Connectivity Improvement Extent </li></ul><ul><ul><li>Length of stream centerline in dam subwatershed (10) </li></ul></ul><ul><li>Fisheries Habitat </li></ul><ul><ul><li>Presence of coldwater stream in dam subwatershed (5) </li></ul></ul><ul><ul><li>Number of dams downstream to the ocean (5) </li></ul></ul><ul><ul><li>Head of tide (5) </li></ul></ul><ul><li>Water Quality </li></ul><ul><ul><li>Living Waters in dam subwatershed (5) </li></ul></ul><ul><ul><li>Road Density (10) </li></ul></ul>
    12. 12. Success! <ul><li>Statewide Restoration Benefit score for 2600 dam sites. </li></ul><ul><ul><li>All Major Watersheds except Cape and Islands </li></ul></ul><ul><li>New Data </li></ul><ul><ul><li>Dam Watersheds </li></ul></ul><ul><ul><li>Dam Subwatersheds </li></ul></ul><ul><li>Attributes of Dams </li></ul><ul><ul><li>Coldwater stream in subwatershed </li></ul></ul><ul><ul><li>Road density in watershed </li></ul></ul><ul><ul><li>Number of dams downstream to ocean </li></ul></ul><ul><ul><li>Head of tide </li></ul></ul><ul><li>Flexible scoring tools </li></ul>
    13. 13. Wisconsin Metrics <ul><li>Dam on headwaters </li></ul><ul><li>Dam in highest quartile of dams per mile in watershed </li></ul><ul><li>Endangered species </li></ul><ul><li>Four levels of sport fish </li></ul><ul><li>303d impairment caused by dam </li></ul><ul><li>Outstanding/Exceptional resource streams </li></ul><ul><li>Connect score (upstream and downstream) </li></ul>
    14. 14. Model Limitations <ul><li>Abstraction Distortion </li></ul><ul><ul><li>This pertains to all computer models of the environment. In order to model an aspect of the environment, it has to first be abstracted into values and shapes that cannot reflect the true diversity of the natural world. </li></ul></ul><ul><li>Data Limitations </li></ul><ul><ul><li>The location of dams, missing or inaccurate centerlines and incorrect attributes in the dams data produce errors. </li></ul></ul><ul><li>Software Limitations </li></ul><ul><ul><li>A.K.A. bugs and requirements. </li></ul></ul><ul><li>Metric Selection </li></ul><ul><ul><li>The results would be altered by the inclusion of different metrics (excluding Living Waters, replacing road density with impervious surfaces or adding 303d) </li></ul></ul><ul><ul><li>Metrics are limited to the data available. </li></ul></ul><ul><li>Metric Weighting </li></ul><ul><ul><li>The results would also be changed by shifted the weighting of the metrics. </li></ul></ul><ul><li>Procedural Errors </li></ul><ul><ul><li>The modeler may make mistakes in the use of the software or in the development of the model scripts. </li></ul></ul><ul><li>Interpretation </li></ul><ul><ul><li>A model created to identify opportunities may be mistaken for a proposed list of projects. A dam with a high Restoration Potential score is a good candidate for assessment, but even a cursory assessment may deem it to be a poor candidate for a project. This is the most difficult source of error to control. </li></ul></ul>
    15. 15. Quality Issues and Processes <ul><li>Check all watersheds less than 20,000 square meters </li></ul><ul><ul><li>Tag secondary structures (dikes) </li></ul></ul><ul><ul><li>Move misplaced dams </li></ul></ul><ul><ul><li>Tag errors </li></ul></ul><ul><ul><li>‘ Nudge’ unresponsive dams </li></ul></ul><ul><ul><li>Rerun watershed delineation </li></ul></ul><ul><li>Stream surveys add small dams and verify dams </li></ul><ul><li>Missing or incorrect attributes </li></ul>
    16. 16. Watershed Delineation Variation
    17. 17. Sample Testing <ul><li>Strong statistical Pearson correlation to ranking of 35 dams by Riverways staff (Tim and Brian.) </li></ul><ul><li>Review of highest scoring dams with alternative metrics </li></ul><ul><li>Stimulated interest in new locations. </li></ul><ul><li>Maps are effective communication tools. </li></ul>
    18. 18. Using the Restoration Potential Model <ul><li>Input to prioritization </li></ul><ul><ul><li>Site visits </li></ul></ul><ul><ul><li>Project proposals </li></ul></ul><ul><li>Communications tool </li></ul><ul><ul><li>Full presentation for restoration planners </li></ul></ul><ul><ul><li>Background or input to restoration discussion with broader audience </li></ul></ul><ul><ul><li>Dams in River Context </li></ul></ul><ul><li>Source of information </li></ul><ul><ul><li>Data for grant proposals </li></ul></ul><ul><li>Measure and track progress </li></ul>
    19. 19. Dam Subwatersheds with Coldwater Streams
    20. 20. Subwatershed Areas
    21. 24. Next Steps: Model Improvement <ul><li>Continually improve dam data: periodically rerun model. </li></ul><ul><ul><li>Improve accuracy of ‘dams downstream’ </li></ul></ul><ul><li>ModelBuilder structure enables rapid change and multiple variations </li></ul><ul><ul><li>Identify headwaters streams </li></ul></ul><ul><ul><li>Fish passage: ladders, lifts, trucks, etc. </li></ul></ul><ul><li>Reconsider Community Value </li></ul><ul><ul><li>Identify flood control dams </li></ul></ul><ul><ul><li>Check hydroelectric and water supply dams </li></ul></ul><ul><ul><li>Impoundments feature class editing </li></ul></ul>

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