Upper little bow river presentation

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  • 1. 1. Upper Little Bow Restoration Plan Purpose & Objectives2. Study Area and Reach Descriptions3. Restoration Plan Scope of Work4. Work Completed to Date5. Reach Descriptions, Concerns and Restoration Options Reach 1 Reach 2 Reach 3 Reach 46. Future Work
  • 2. o Improve the ecological function of the river segmento Improve the river water quality towards meeting federal and provincial guideline valueso Provide preliminary treatment for collected stormwater discharging to the rivero Address citizen’s concerns regarding nuisance issues (i.e. odour, garbage)
  • 3. Facts about the Upper Little Bow(ULB) Study Area:o 1660 m headwater segment of Little Bow Rivero Located entirely within the Towno Divided into 4 reaches for planning:Reach 1 o Originates at 5th Ave SE, ends at 8th Ave SE o Flows south to Reach 2Reach 2 o Originates at 8th Ave SE, ends at 10th Ave SE o Flows south, as a tributary of Reach 3
  • 4. o Divided into 4 reaches for planning:Reach 3 o Originates at 9th Ave SE, ends at 12th Ave SE o Flows southeast into Reach 4Reach 4 o Originates at 12th Ave SE, ends at 5th St. SE o Flows southeast
  • 5. o Phase 1. Hydrologic Assessmento Phase 2. Remedial Option Analysiso Phase 3. Conceptual Restoration Action Plan and Public Consultationo Phase 4. Detailed Design (phased approach)o Phase 5. Construction and Clean-up (phased approach)
  • 6. o Phase 1. Hydrologic Assessment – Initial Reports Complete • Assessed hydrologic (groundwater and surface) influences, potential impacts and water quality • Work is ongoing to answer questions related to hydrology and related impacts • REPORT: June 2010 – Upper Little Bow River Hydrologic Assessment • REPORT: December 2010 – Little Bow River Water Quality Monitoring
  • 7. o Phase 2 – Remedial Option Analysis – Complete • Developed high-level restoration options and assessed potential impacts for regulatory review • Met with Alberta Environment and Water (AEW) to review options & determine next actions • Reviewed options with Fisheries and Oceans Canada (DFO) • REPORT: September, 2010 – Upper Little Bow River Restoration Options and Impact Assessment (Draft for Discussion) • REPORT: February, 2011 – Conceptual Remedial Action Plan for Upper Little Bow River (Draft)
  • 8. o Phase 3 – Conceptual Restoration Action Plan & Stakeholder Consultation – Current • Prepared preliminary conceptual designs and best management practices proposed for restoration • Undertook work to refine restoration designs • Performed high-level risk review (in review) • Presenting design options to public for review and feedback at open house • Finalizing plan and conceptual designs based on stakeholder feedback • REPORT: September, 2011 – Upper Little Bow Sediment Survey (Draft Report). This report present results from the sediment survey carried out in Reach 1 and Reach 3 • REPORT: March, 2012 – Risk Review for the Upper Little Bow River, High River Alberta
  • 9. o Reach 1 is located between 5th Ave SE and 8th Ave SEo Concerns Include: • Odour and aesthetics • Sedimentation & channel morphology impacts due to dredging • Poor sediment and water quality • Garbage and debris Looking downstream from start of Reach 1 Reach 1 outlet culvert
  • 10. o Clean-up debriso Remove sedimento Install forebay at main upstream inlet o Trap sediments o Applied for all options (see below)o Treat other stormwater inflows • Grassed swales, bioswaleso Channel restoration options • Options 1a: Maintains existing channel features including open water areas and morphology • Option 1b: Maintains existing channel morphology but use imported fill to limit depth of pools • Option 2: Channelizes “pool” areas using imported fill, establishes riparian areas and re- grades/fills channel to improve flow and reduces stagnation
  • 11. o Option 1a Maintains existing structure, removes sediment • Treats incoming stormwater and reduces sediment in channel • Maintains open water areas for waterfowl • Does not addresses stagnation or odour issueso Option 1b Maintains pools but minimizes pool depth by replacing channel bottom with clean sand/gravel fill • Treats incoming stormwater and reduces sediment in channel • Decreases pool depths and storage resulting in a slight increase in flow velocity • Provides “clean” channel bottom habitat for aquatic species
  • 12. o Option 2 Channelizes pool areas and re-grades • Treats incoming stormwater and reduced sediment in channel • Increases flow and decrease stagnation, minimizing odour • Loss of open water habitat • Gain of riparian and flowing water habitat
  • 13. o Reach 2 is located between 8th Ave SE and 10th Ave SEo Concerns Include: • Sedimentation • Garbage and debriso Restoration: • Remove garbage and debris Looking downstream into Reach 2 Reach 2 inlet culvert
  • 14. o Reach 3 is located between 9th Ave SE and 12th Ave SEo Concerns Include: • Sedimentation • Garbage and debris • Decrease of Fall and Winter baseflow Looking upstream from 12th Ave SE Looking east Reach 3
  • 15. o Clean-up debris and garbageo Undertake trials to remove sediments using low impact methodso Treats all stormwater inflows • Grassed swales, bioswales, oil-grit separators
  • 16. o Treatment of stormwater inflows will: • Improve stormwater quality • Minimize suspended sediment entering the systemo Removal of debris and sediment improves channel water quality and channel bottom habitat
  • 17. o Reach 4 is located south of 12th Ave SE & northwest of 5th St SEo Concerns Include: • Odour • Sedimentation and debris • Limited riparian vegetation Looking downstream to end of Reach 4 Looking west from 5th St SE
  • 18. o Debris and sediment removal will help reduce odourso Riparian vegetation will: • Provide habitat for wildlife • Reduce water temperature, increasing oxygen levels and encouraging use by fish • Reduce odour • Reduce occurrence of algal mats Looking west from Visitor Information Centre
  • 19. o Finalize conceptual design based on stakeholder feedbacko Prepare detailed designs and construction plans • Phased approach with high-priority items addressed firsto Submit plans for regulatory review and obtain approvalo Perform works and execute plan using a phased approach