Final Nmrwp Scm Meeting 11 15 05 Mrc

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Final Nmrwp Scm Meeting 11 15 05 Mrc

  1. 1. New Meadows Lake Tidal Restoration Feasibility Study November 15, 2005 Steering Committee Meeting Sponsored by: With funding provided by:
  2. 2. <ul><li>Study Goal & Objectives To develop and evaluate the feasibility of technical alternatives for improving water quality and enhancing ecological resources in New Meadows Lake through increased tidal exchange. </li></ul><ul><li>Public Involvement </li></ul><ul><li>A key component of the study process and any ultimate decision-making process. </li></ul><ul><li>There will be three public forums during the study. </li></ul>
  3. 3. Study Progress <ul><li>Temperature and Stage Data </li></ul><ul><li>Bathymetry Data </li></ul><ul><ul><li>Bathymetry </li></ul></ul><ul><ul><li>Stage-Volume Relation </li></ul></ul><ul><li>Preliminary Model Development </li></ul><ul><ul><li>Calibration </li></ul></ul><ul><ul><li>Conceptual Alternatives </li></ul></ul><ul><li>Discussion of Conceptual Alternatives </li></ul>
  4. 4. Temperature and Stage Data <ul><ul><li>Temperature/Pressure Transducers Installed July 29, 2005 </li></ul></ul><ul><ul><li>Temperature/Pressure Transducers Retrieved October 14, 2005 </li></ul></ul>
  5. 5. Stage Data <ul><ul><li>Water Surface Elevations (Stage): New Meadows River (blue) and New Meadows Lake (red) </li></ul></ul>
  6. 6. Bathymetry Data <ul><li>Complete Bathymetry Mapping of Upper and Lower Lake </li></ul><ul><li>Data Corrected for Changes in Tidal Stage </li></ul><ul><li>Data in Maine West 1983 Coordinate Plane </li></ul>
  7. 7. Stage-Volume Relation
  8. 8. Preliminary Model Development <ul><li>HEC-RAS Model Development </li></ul><ul><ul><li>Geometry Data From Bathymetry and Existing Information </li></ul></ul><ul><ul><li>Tidal Stage Data for Input </li></ul></ul>
  9. 9. Alternative 1: Deeper Culvert <ul><li>Existing Culvert Alignment and Width with Invert Set 2.4-ft Below Current Invert </li></ul><ul><li>Lower Typical Lake Level </li></ul><ul><li>Tidal Stage Variation Does Note Change </li></ul>
  10. 10. Alternative 2: Deeper/Wider Culvert <ul><li>Existing Culvert Alignment and Double-Width (24-ft) and Invert Set 4.4-ft Below Current Invert </li></ul><ul><li>Lower Typical Lake Level </li></ul><ul><li>Tidal Stage Variation Does Note Change </li></ul>
  11. 11. Alternative 4: Bridge Replacing Culvert <ul><li>Bridge Through Embankment </li></ul><ul><li>Width of 50-ft </li></ul><ul><li>Invert Set Below MLW </li></ul>
  12. 12. Alternative 4: Bridge Replacing Culvert <ul><li>Substantial Tidal Stage Variation </li></ul>
  13. 13. Thank you <ul><li>Questions? Comments? </li></ul>

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