Tempe Town Lake Downstream Dam Replacement NEW DAM ALTERNATIVES SELECTION January 5, 2012.

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Presentation transcript:

Tempe Town Lake Downstream Dam Replacement NEW DAM ALTERNATIVES SELECTION January 5, 2012

Timeline * Alternatives Evaluation – June thru November Project Update with Council – September 22 Phase 1 Validate Concept & Select Dam Technology – November 2011 Phase 2 Design New Dam / Acquire Permits – complete by July 2013 Bid and Procure Construction Contract by October 2013 Start Construction by November 2013 Construction Complete – December 28, 2015 * Per current agreement with Bridgestone.

Dam Design Criteria Maintain or Improve Current Level of Flood Protection Maintain Full Lake Quickly After Flood Event Raise, Lower and Operate Reliably at Normal Lake Levels Be Cost Efficient – Capital, Lifespan, O&M Have Parts Easily Available Be Compatible with Pedestrian Bridge, Existing Structures Perform Well in this Climate Meet Regulatory Requirements

Regulatory Conditions Regulatory Agency Concerns U. S. Army Corps of Engineers Water quality, channel conditions, 404 permitting Flood Control District of Maricopa County Flood control, levee maintenance Federal Emergency Management Agency (FEMA) Flood control, levees Arizona Department of Water Resources Dam Safety

Alternatives Evaluation About 20 Dam Options Studied: Radial (Tainter) Gates Bascule or Bottom-Hinged Leaf Gates Inflatable Rubber Dams(water and air-filled) Ogee Crest Weirs Labyrinth Weirs Many Styles of Fuse Plugs Several Styles of Pneumatically-Operated Hinged Crest Gates (Obermeyer) Hydraulic Hinged Crest Gates Dyrhoff Rubber Dams (Sumitomo) Vertical Lift Gates Swing Gates Fusegates (Hydroplus) Earth Embankment/Fuseplug Several Styles of Mixed-type Spans Cable-Operated Hinged Crest Gate Others

Three Viable Alternatives Sumitomo Rubber Dam Obermeyer Gate Hydraulic Hinged Crest Gate

Proposed Alternative Locations Sumitomo – Replacing bladders, same location Pedestrian Bridge

Proposed Alternative Locations Obermeyer – Adjacent to existing dam Pedestrian Bridge

Proposed Alternative Locations Hinged Crest Gate–100ft west of existing dam Pedestrian Bridge

Life Cycle Costs Alternatives Total Project Construction Cost Total 50-Year Life Cycle Costs (Present Value) Total Construction and Life Cycle Cost (Present Value) Sumitomo Rubber Bladders - 10 Yr. Rubber Life (Replace Rubber Bladder every 10 years) $40,900,000 $138,300,000 $179,200,000 Obermeyer Gates - 10 Yr. Rubber Life $32,800,000 $41,600,000 $74,400,000 Hinged Crest Gates $35,400,000 $32,700,000 $68,100,000

Dam Recommendation Hydraulically Operated Hinged Crest Gate Safety & Reliability Durability Value (cost competitive) Engineering Requirements Regulatory Requirements

Dam Financing Preliminary Capital Cost Estimates: $36 Million Includes Design, Materials, Construction Does Not Include East Dam or Pump System (New East Dam repl. $8M-$10M) Finance Options Include: Use Remaining $3,633,000 Seek Voter Approval for Bond Authorization for Dam Replacement Capital Costs Sale of City Properties Lease / Purchase Agreement Combinations

Next Steps Public Meeting, Jan. 11, 5:30 p.m. Tempe Center for the Arts Return to Council Jan. 19 Review Financing Options Design, Permit, Build Want more information? Visit www.tempe.gov/lake Click on Town Lake Dam Replacement in the Blue Box