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