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City of Noblesville LTCP – Phase 3: A Case Study of CSO Storage Facilities
CHA Consulting | November 21, 2013
Today’s Presentation•Background
– City of Noblesville– Long-Term Control Plan– Preliminary Design
•Detailed Design/Design Challenges– Storage Tank– Conveyance Sewer
•Construction Implementation
Noblesville, Indiana
Noblesville’s Collection System•Population = 40,000
•32 Square Mile Service Area
•233 Miles of Separate Sanitary Sewer
•12 Miles of Combined Sewer
Noblesville’s CSO Locations•Eight CSO Outfall Locations
– Six Outfalls to White River– Two Outfalls to Wilson’s Ditch
Noblesville’s Regional/Phased Approach to LTCP•CSO Area Broken into Four Regions
– North Region – Sewer Separation– East/Central/South Regions – Convey,
Store & Treat
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
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.
Phase 3, Division 2: Detailed Design
Phase 3, Division 2: Detailed Design
Phase 3, Division 2: Detailed Design
Phase 3, Division 2: Detailed Design
Phase 3, Division 2: Detailed Design
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation
Phase 3, Division 2: Construction Implementation