1. City of Noblesville LTCP – Phase 3: A
Case Study of CSO Storage Facilities
CHA Consulting | November 21, 2013

2. Today’s Presentation
•Background
– City of Noblesville
– Long-Term Control Plan
– Preliminary Design
•Detailed Design/Design Challenges
– Storage Tank
– Conveyance Sewer
•Construction Implementation

3. Noblesville, Indiana

4. Noblesville’s Collection System
•Population = 40,000
•32 Square Mile Service Area
•233 Miles of Separate Sanitary Sewer
•12 Miles of Combined Sewer

5. Noblesville’s CSO Locations
•Eight CSO Outfall Locations
– Six Outfalls to White River
– Two Outfalls to Wilson’s Ditch

6. Noblesville’s
Regional/Phased Approach
to LTCP
•CSO Area Broken into Four Regions
– North Region – Sewer Separation
– East/Central/South Regions – Convey,
Store & Treat

8. Phase 3: Preliminary
Design
•SWMM Modeling
– Determine overflow rates – size
relief sewers
– Determine overflow volumes –
size storage facilities
•Focus on Worst Regions First
– East Relief Sewer
– Central Relief Sewer
•Central Storage Facility
•Modeled Proposed Facilities

9. Phase 3, Division 2:
Preliminary Design
•2.2 MG Underground Storage
– 1.2 MG Storage Tank (sized for 1-
YR, 1-HR Storm)
– 1.0 MG Storage Tank (sized for
10-YR, 1-HR Storm
•Dual Submersible 5 MGD
Dewatering Pumps
– Controlled by VFDs integrated
into Plant SCADA
– Dewatering to WWTP Headworks
•Cleaning via nine (9) hydraulically
operated flushing gates.

10. Phase 3, Division 2: Detailed Design

11. Phase 3, Division 2: Detailed Design

12. Phase 3, Division 2: Detailed Design

13. Phase 3, Division 2: Detailed Design

14. Phase 3, Division 2: Detailed Design

15. Phase 3, Division 2: Construction Implementation

16. Phase 3, Division 2: Construction Implementation

17. Phase 3, Division 2: Construction Implementation

18. Phase 3, Division 2: Construction Implementation

19. Phase 3, Division 2: Construction Implementation

20. Phase 3, Division 2: Construction Implementation

21. Phase 3, Division 2: Construction Implementation

22. Phase 3, Division 2: Construction Implementation

23. Phase 3, Division 2: Construction Implementation

24. Phase 3, Division 2: Construction Implementation

25. Phase 3, Division 2: Construction Implementation

26. Phase 3, Division 2: Construction Implementation

27. Phase 3, Division 2: Construction Implementation

28. Phase 3, Division 2: Construction Implementation