#13 - Comp Plan - Trends & Implications -continued

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#13 - Comp Plan - Trends & Implications -continued

  1. 1. Direct Demands continued Mining Public Land Recreation
  2. 2. Mining
  3. 3. Mining - Review of Current Plan <ul><li>Very general </li></ul><ul><li>Notes </li></ul><ul><ul><li>Sand </li></ul></ul><ul><ul><li>Black Dirt </li></ul></ul>
  4. 4. Current Mines
  5. 5. Mining - Trends <ul><li>Flat </li></ul><ul><ul><li>Extraction (NSC/Rehbein) </li></ul></ul><ul><ul><li>Excavation/Conversion </li></ul></ul><ul><ul><li>(The Lakes & Emily’s Waters) </li></ul></ul>
  6. 6. Mining - Trends <ul><li>Demand for </li></ul><ul><ul><li>Dewatering </li></ul></ul><ul><ul><li>Water </li></ul></ul>
  7. 7. Mining - Implications of Trends <ul><li>Land Subsidence </li></ul>
  8. 8. Mining - Implications of Trends <ul><li>Decrease in Groundwater Supplies </li></ul>
  9. 9. Mining - Implications of Trends <ul><li>Increase in Evapotranspiration </li></ul>
  10. 10. Mining - Implications of Trends Changes in Wetlands, Lakes, Trees and Parks
  11. 11. Mining - Expectations for Future Management <ul><li>Use sources other than groundwater (Partially or entirely) </li></ul><ul><li>Import water </li></ul>
  12. 12. Mining - Expectations for Future Management <ul><li>Changes in </li></ul><ul><ul><li>rates </li></ul></ul><ul><ul><li>time and </li></ul></ul><ul><ul><li>spatial distribution </li></ul></ul><ul><li> of pumping </li></ul>
  13. 13. Mining - Expectations for Future Management <ul><li>Increase recharge (Infiltration zones) </li></ul><ul><ul><li>Recharge of surface water or reused water (ground water or surface water) </li></ul></ul>
  14. 14. Mining - Expectations for Future Management <ul><li>Decrease discharge from groundwater </li></ul><ul><ul><li>Decrease loss to evapotranspiration </li></ul></ul><ul><ul><li>Decrease potential loss to ET </li></ul></ul>
  15. 15. Recreation Lands
  16. 16. Current Recreation Lands
  17. 17. Recreation -Review of Current Plan <ul><li>Plan does not directly address recreational lands or uses of watershed resources </li></ul>19,916 1,767 16,766 1,383 Acres 147 141 3 4 # Total 9% City Parks 84% Regional Parks 7% Golf Courses Pct Facility Type
  18. 18. Recreation - Trends <ul><li>Increase in navigation of the Creek </li></ul><ul><li>Increase in Lake use </li></ul><ul><li>Increased evaluation of ditch corridors for trail purposes </li></ul>
  19. 19. Recreation - Expectations for Management <ul><li>Increased requests/complaints about keeping the channel clear </li></ul><ul><li>Need to discuss </li></ul><ul><ul><li>Part of 103D mission but numbers are small </li></ul></ul>
  20. 20. Public Land
  21. 21. Public Land - Current Plan <ul><li>Public land and recreation facilities addressed together </li></ul><ul><li>Cites 10,000 acres of Public Land </li></ul><ul><li>GIS=11,687 acres </li></ul><ul><li>20% of watershed </li></ul>
  22. 22. Public Land - Trends <ul><li>No additional acreage </li></ul><ul><li>Changes in operation & management </li></ul><ul><ul><li>Watering </li></ul></ul><ul><ul><li>Use of chemicals (Highways) </li></ul></ul>
  23. 23. Public Land Implications for Management <ul><li>Contribution to loadings and associated costs becomes an issue </li></ul><ul><li>Increased need for SWPPPs/SAMPs </li></ul>
  24. 24. Public Land - Expectations for Management of Water <ul><li>New ground for some public managers </li></ul><ul><li>Politics of Operations & Maintenance </li></ul>
  25. 25. Indirect Demands Flood Control Groundwater Recharge Water Quality
  26. 26. Property Damage Avoided Flood Control
  27. 27. Flood Control - Current Plan <ul><li>Maintain existing 100-year floodplain profiles </li></ul><ul><li>“ No-net loss” of volume policy </li></ul><ul><li>Requires a permit to alter floodplain </li></ul><ul><li>100-yr elevations depend on maintained system </li></ul>
  28. 28. Flood Control - Current Plan <ul><li>Management Principles </li></ul><ul><li>ID Floodplain </li></ul><ul><li>ID Impact </li></ul><ul><li>Require replacement </li></ul><ul><ul><ul><li>By Volume </li></ul></ul></ul><ul><ul><ul><li>Within Relevant Reach </li></ul></ul></ul>
  29. 29. Flood Control - Trends <ul><li>‘ The Lakes’ decreased amount of floodplain by 1,000 acres </li></ul><ul><li>Drought has influenced flooding in last 10 years </li></ul>
  30. 30. Flood Control - Trends <ul><li>Ponding has reduced peaks + sustained flows at lower elevations </li></ul><ul><li>Infiltration will decrease volume </li></ul>
  31. 31. Flood Control - Implications <ul><li>If climate is changing, could experience: </li></ul><ul><ul><li>More “localized” Regional flood events </li></ul></ul><ul><ul><li>Storms outside the “normal” distribution </li></ul></ul><ul><ul><ul><li>Higher Highs </li></ul></ul></ul><ul><ul><ul><li>Lower Lows </li></ul></ul></ul>
  32. 32. Flood Control - Expectations for Management <ul><li>Public comment/pressure on </li></ul><ul><ul><li>Dry ponds </li></ul></ul><ul><ul><li>Over-designed ponds </li></ul></ul><ul><ul><li>Unused </li></ul></ul><ul><ul><li>Restricted Land & Floodplain </li></ul></ul><ul><ul><li>Encumbered </li></ul></ul>
  33. 33. Why are we paying to have Bart inoculated against diseases he never gets? Homer Simpson
  34. 34. Groundwater Recharge
  35. 35. Groundwater Recharge Current Plan <ul><li>Focus on flood prevention from high water table </li></ul><ul><li>Recognizes varying availability of groundwater </li></ul><ul><li>Requires first inch infiltrated </li></ul>
  36. 36. Groundwater Recharge -Trends <ul><li>Fewer areas not ‘hardened’ by development </li></ul>
  37. 37. Groundwater Recharge Implications <ul><li>The only way to influence surficial groundwater </li></ul><ul><li>Various methods will need to be considered </li></ul>
  38. 38. Groundwater Recharge Expectations for Management <ul><li>Could become a major activity of District </li></ul>
  39. 39. Water Quality Improvement & Stormwater Protection
  40. 40. Water Quality & Stormwater Current Plan <ul><li>Regulate land management practices </li></ul><ul><li>Keep disturbed areas small </li></ul><ul><li>Stabilize soils ASAP </li></ul><ul><li>Require pretreatment </li></ul><ul><li>Standards are non-specific </li></ul>
  41. 41. Water Quality & Stormwater Current Plan <ul><li>Keep Velocities low </li></ul><ul><li>Maintain existing flood profiles </li></ul><ul><ul><li>Use combination of successive BMPs </li></ul></ul><ul><ul><li>Utilize natural infrastructure within their capability </li></ul></ul><ul><ul><li>Require infiltration </li></ul></ul>
  42. 42. Water Quality & Stormwater Trends <ul><li>Flush effect in lower watershed </li></ul><ul><li>Increase in several parameters </li></ul><ul><li> Storm Related </li></ul>
  43. 43. Water Quality & Stormwater - Implications <ul><li>Exceeding standards for </li></ul><ul><ul><li>Turbidity </li></ul></ul><ul><ul><li>Total Suspended Solids </li></ul></ul><ul><ul><li>Phosphorus </li></ul></ul><ul><li>Lower (older) portion of the watershed lacks infrastructure needed for water quality </li></ul>
  44. 44. Water Quality & Stormwater - Expectations <ul><li>“Impaired” listing for </li></ul><ul><ul><li>Turbidity </li></ul></ul><ul><ul><li>Phosphorus </li></ul></ul><ul><li>Active retrofitting lower creek </li></ul><ul><li>Creative infrastructure/close coordination with City </li></ul>
  45. 45. Questions? Thank You Coon Creek Watershed District

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