1. City of Greencastle Flood 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.) Well field Big Walnut Creek Filter Facility Lagoon 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) Filter Facility Lagoon Big Walnut Creek

10. Site Assessment (cont.) Watershed area obtained 216 mi 2 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. Low head dam Finished floor elevation

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.) Elevated structure Dry floodproofing

16. Design Options (cont.) Initial Cost (35%) Lifespan (35%) Maintenance (20%) Constructability (20%) Overall Levee44323.6 Floodproofing51543.5 Floodwall24343.1 Building Relocation 15513.2 Decision based on four criteria Initial cost Lifespan Maintenance Constructability

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

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’ 13’ Elev. 690’ SectionPermeability (ft/s)Height (ft)Width (ft)Seepage (ft 3 /s/ft) A-A’3 x 10 -10 5286.494 x 10 -11 B-B’3 x 10 -10 6.535.51.238 x 10 -10 C-C’3 x 10 -10 13684.578 x 10 -10 D-D’3 x 10 -10 12634.005 x 10 -10 E-E’3 x 10 -10 11.2559.53.639 x 10 -10 Total seepage is 0.0244 ft 3 /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 Initial Cost (30%) Lifespan (30%) Maintenance (20%) Protection (20%) Overall Chain Link Fence with Barbed Wire 14553.8 Color Weatherproof Camera 52413.0 Infrared Sensor Lights 51533.5

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???