20130901 public meeting_4 (1)

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  • 20130901 public meeting_4 (1)

    1. 1. Upper Malletts Creek Stormwater Conveyance Study Project Update September 30, 2013
    2. 2. Meeting Purpose • Discussion of project recommendations • Gather public feedback Items to Review and Discuss • Alternatives ▫ Review alternative selection process ▫ Present modeling results and recommendations • Discussion • Next step – Final Report and City Council Presentation
    3. 3. Project Goals • Reduce probability of flooding by improving stormwater management • Identify cost of implementation per level of service • Do not adversely impact downstream interests • Maintain and/or enhance water quality • Long term sustainability
    4. 4. Available Information • Website ▫ Online at www.uppermallettsstudy.org • Online Flood Reporting Tool
    5. 5. Original Alternatives
    6. 6. Alternative Development
    7. 7. Areas Outside of City Boundary Ice Cube Medium Meadowinds Basin Low X X X 2 3 4 X X X X X X 5 6 X X Alternative Package 7 Alternative Package 5 Alternative Package 6 Alternative Package 4 X X X X X X X X 1 Low Low Alternative Package 3 High Medium High Low Low Medium Low Alternative Package 2 High High Medium Low Low Low Low Alternative Package 1 Expected Cost Name Lawton Park Eisenhower Park Lans Basin Pioneer HS (W of 7th) Pioneer HS (E of 7th) Cardinal Homes Las Vegas Impact Potential Alternative Packages X X X X X X X 7
    8. 8. Flooding Map – March 15, 2012
    9. 9. Eisenhower/Churchill Park Initial Volume (cu. ft) 425,000 Conceptual Volume 390,000 Surface Area (acres) 1.9 Anticipated Costs $1,250,000 Drainage Area
    10. 10. Flooding Map – Post Eisenhower
    11. 11. Pioneer/Scio Church Improvements Drainage Area Initial Volume (cu. ft) 80,000 Conceptual Volume 400,000 Surface Area (acres) 2.8 Anticipated Costs $1,000,000
    12. 12. Flooding Map – Post Pioneer
    13. 13. Lawton Park Initial Volume (cu. ft) 825,000 Conceptual Volume 340,000 Surface Area (acres) 1.4 Anticipated Costs $4,500,000 Drainage Area
    14. 14. Flooding Map – Post Lawton
    15. 15. Volume Comparison Location Lawton Park Eisenhower Park Pioneer (E. of 7th) Total Original Est. Volume Conceptual Volume 825,000 340,000 425,000 390,000 80,000 400,000 1,330,000 1,130,000
    16. 16. Footing drain analysis • • • • Measured flow approximately 5 gallons per minute Study using conservative flow of 10 gpm Total system flow is 483 cubic feet per second Total footing drain flow is 28 cfs Footing Drain Flow as Percentage Of Overall System Flow 5.8% 94.2%
    17. 17. Footing drain analysis Footing Drain Flow as Percentage Of Eisenhower Basin Flow Footing Drain Flow as Percentage Of Lawton Basin Flow 2.2% 5.4% 97.8% 94.6% No flow attributed to Pioneer basin due to drainage area specifics
    18. 18. Discussion
    19. 19. Next Steps • Prepare report • Presentation to Ann Arbor City Council
    20. 20. Upper Malletts Creek Stormwater Conveyance Study Timeline Public Engagement Preliminary Alternatives Analysis & Memo Finalized Alternatives Analysis & Memo February 2014 Final Study Report January 2014 September 2013 July 2013 April 2013 March 2013 February 2013 Data Collection, Monitorin g, & Modeling Project Award January 2013 Draft Study Report December 2013 Gather Information
    21. 21. Upper Malletts Creek Stormwater Conveyance Study Project Update September 30, 2013
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