Engineering & Operations Committee Item 6b November 4, 2019 - - PowerPoint PPT Presentation

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Dec 23, 2022 383 likes •535 views

Engineering & Operations Committee Item 6b November 4, 2019 Seismic Resilience Strategy Planning Operations Engineering Reporting Goal: Maintain Goal: Provide Goal: Provide Goal: Mitigate effective emer- system flexibility,

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Engineering & Operations Committee Item 6b November 4, 2019

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Seismic Resilience Strategy

Operations

Goal: Maintain effective emergency planning & response capabilities

Reporting

Goal: Provide accountability & transparency

Planning

Goal: Provide system flexibility, diversified supply portfolio, & emergency storage

Engineering

Goal: Mitigate seismic risks of infrastructure & water system as a whole

Seismic Resilience Water Supply Task Force

Goal: Enhance the seismic resilience of imported water supplies through multi-agency collaboration

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E&O Committee Item 6b Slide 3 November 4, 2019

CASTAIC LAKE GARVEY RESERVOIR SILVERWOOD LAKE LAKE PERRIS DIAMOND VALLEY LAKE LAKE SKINNER LAKE MATHEWS LIVE OAK RESERVOIR

Casa Loma Siphon Barrel No. 1

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E&O Committee Item 6b Slide 4 November 4, 2019

Project Area

San Diego Canal San Jacinto Diversion Structure Casa Loma Fault Bernasconi Tunnel

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E&O Committee Item 6b Slide 5 November 4, 2019

148-in concrete pipe constructed in 1935 Ground subsidence due to groundwater withdrawal Multiple repairs to address leaks

300 ft of concrete pipe replaced with steel pipe & external sleeve type couplings in 1968 Internal seals installed in 1996 & 2017

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E&O Committee Item 6b Slide 6 November 4, 2019

Earthquake Resistant Ductile Iron Pipe (ERDIP)

Developed by Kubota Corp. Absorbs large displacements & allows pipeline to remain intact

Over 40 years of experience in Japan xperience

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E&O Committee Item 6b Slide 7 November 4, 2019

May 2018 authorization for design to replace Casa Loma Siphon Barrel No. 1

Kubota Sole Source Supplier Widely used in Japan since 1970’s Used in US & Canada since 2013 Valley Water, SFPUC, EBMUD, LADWP & MWD

Valley Water District Japan

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E&O Committee Item 6b Slide 8 November 4, 2019

Geotechnical Investigation Fault Hazard Evaluation Design Criteria Development Structural Modeling Verification Performance Testing

Final Design Material Procurement Recommendation

Welded Steel Pipe (Competitively Bid) ERDIP (Negotiated sole-source contract)

Construction

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E&O Committee Item 6b Slide 9 November 4, 2019

Geotechnical Investigation Fault Hazard Evaluation

Potential fault displacement of 13 ft. horizontal, 3 ft. vert. Potential subsidence of 5 ft.

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E&O Committee Item 6b Slide 10 November 4, 2019

Fault Interaction Model ERDIP Joint Model

Primary fault

Before After

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E&O Committee Item 6b Slide 11 November 4, 2019

Final deflection angle of 4.26 degrees Un-rotated position

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E&O Committee Item 6b Slide 12 November 4, 2019

104”/148” Steel Pipe 148”/104” Steel Pipe 104” ERDIP

Fault line Existing 148-in dia ERDIP Steel

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E&O Committee Item 6b Slide 13 November 4, 2019

December 2019: Award Procurement Contracts ERDIP: sole source agreement with Kubota Welded steel pipe competitively bid June 2020: Board Award Installation Final tie-in during February 2021 shutdown

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