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City of Greencastle Flood Protection Plan

City of Greencastle Flood Protection Plan. Presented by, United Geotech, LTD. Introduction. Team Overview Project Overview Design Requirements Project Approach Final Design Questions. Team Overview. Sarah Bireley– Project Manager Amee Wicks – Project Engineer

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City of Greencastle Flood Protection Plan

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  1. City of GreencastleFlood Protection Plan Presented by, United Geotech, LTD

  2. Introduction • Team Overview • Project Overview • Design Requirements • Project Approach • Final Design • Questions

  3. Team Overview • Sarah Bireley– Project Manager • Amee Wicks – Project Engineer • Brad Pickering – Project Engineer • Troy Cunat – Project Engineer

  4. Project Overview • Greencastle Water Treatment Plant • Located in Greencastle, Indiana south of Big Walnut Creek • Six wells provide 4,000 gpm peak • Serves population of 10,000 • Site subject to flooding • Located in the flood plain • Rains on Labor Day flooded site

  5. Project Overview (cont.) Big Walnut Creek Well field Lagoon Filter Facility US-231

  6. Project Overview (cont.) Taken September 16, 2003 Taken September 2, 2003

  7. Design Requirements • Confirm finished floor elevation of filter facility • Confirm base flood elevation • Investigate flood protection options • Investigate security options • Deliverables • Proposal • Progress report • Final report

  8. Project Approach • Site assessment • Codes and regulations • Research design options • Flood protection • Security • Choose final design • Complete final design

  9. Site Assessment • Topographic map • Finished floor elevation = 688.54 feet (MSL) Big Walnut Creek Lagoon Filter Facility

  10. Site Assessment (cont.) • Watershed area obtained • 216 mi2 • Determined base flood elevation • Obtained Big Walnut Creek topographic map • 100-year flow determined • Q = 21,400 cfs • Maximum flows used in HEC-RAS to determine base flood elevation • 690.0 feet (MSL)

  11. Site Assessment (cont.)

  12. Site Assessment (cont.) Finished floor elevation Low head dam

  13. Codes and Regulations • Cannot raise base flood elevation more than 0.15 feet • Water tower must be enclosed in fence • Maximum levee side slope of 1:2.5 • No levee construction restrictions

  14. Design Options • Flood control options Levee under construction Floodwall under construction

  15. Design Options (cont.) • Flood control options (cont.) Dry floodproofing Elevated structure

  16. Design Options (cont.) • Decision based on four criteria • Initial cost • Lifespan • Maintenance • Constructability

  17. Levee Design • Obtained soil borings & performed tests B6 B5 B3 B2 B4 B1 • Clay (CH), silt (MH), and sand (SW) present • Suitable for levee

  18. Levee Design (cont.) Lagoon Expansion Filter Facility

  19. Levee Design (cont.) • Levee cross sections

  20. Seepage Analysis • Used SefDam to calculate seepage Elev. 692’ Elev. 690’ 13’ • Total seepage is 0.0244 ft3/day

  21. Slope Stability

  22. Slope Stability (cont.) • XSTABL utilized to analyze slope stability • Eroding slope improved by Greencastle • Additional load from levee analyzed • Additional load does not cause failure

  23. Security • Fencing, lighting, and cameras investigated • Lighting and cameras may be added in future

  24. Security (cont.) Filter Facility

  25. Cost • R.S. Means Manual used to estimate costs • Levee • $71,500 • Security • $24,000 • Total cost • $95,500

  26. Conclusion • Flood levels warrant need for flood protection • Levee chosen as protection option • Seepage and slope stability not a problem • Fencing with barbed wire chosen for security • Cameras and lighting may be added • Total cost of $95,500 • Levee - $71,500 • Security - $24,000

  27. Questions???

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