Dam Construction Project

Location:

Folsom Dam Modification Phase IV, California

Project Overview:

Contain construction sediments within each reservoir’s work zones used to provide seismic and hydraulic upgrades at the three reservoirs built between 1888. Demolition, new tunnel liners, refurbishment or replacement of water management infrastructure with frequent barge traffic with turbidity managed to utilize 9,150’ of tapered TYPE 3 HD turbidity curtains.

ABASCO Contribution

Design engineering, manufacture & installation support

TYPE 3 HD Curtains ranging from 1’ to 120’ in 50’ sections
Dual 5/16” or 3/8” SS top tension cables
3/8” or 1/2” HG chain ballast chain with tension plates
Skirt welded in vertical lengths
Furling lines constructed with 3/16” SS coated cable secured to guides at the waterline
USACE Specification No. 1859, Section #35 31 10

Project Challenges and Features -

Type 3 HD curtains provided down to 120’ water depths
California drought caused water depth reduction with the lake at 14% capacity
Restricted NTU release
Concrete deadweight anchors and Danforth anchors
Long-term application from August 2013 to December 2016
SS cable furling lines required for multiple site relocations

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