Project Name: Columbia Hydroelectric Project

Summary: Design of upstream and downstream fish passage facilities

Client: South Carolina Electric & Gas Company

Project Location: Columbia, SC

Services Provided:
•  Agency Consultation
•  Stakeholder Facilitation
•  Fish Passage Upstream Final Design
•  Fish Passage Downstream Final
•  State and Local Permitting
•  Bid Specifications & Drawings
•  Construction Services
•  Fish Passage Effectiveness Study

Project Timeframe:
2003 - Present

Relationship with Client: Since 1989

Client Needs:

Included in the fishway prescriptions contained in the FERC renewal license for the Columbia Hydroelectric Project, South Carolina Electric & Gas Company (SCE&G) was required to install upstream and downstream fish passage facilities at the project and perform annual monitoring of the facilities as well as test the effectiveness of the fishway.

Kleinschmidt Solution:

Kleinschmidt prepared final design and construction drawings and specifications for the upstream and downstream passage facilities. The two-part project consisted of an upstream passage via a fish ladder located on the east end of the Columbia diversion dam, and a downstream passage through the project powerhouse. A result of a diadromous fish restoration plan, the project targets passage for American shad, blueback herring, American eels, and Atlantic and shortnose sturgeon. The fish ladder consists of two adjacent ramps, with vertically slotted baffles forming thirteen staggered pools. The downstream fish passage consists of a gated fish collection box next to the intakes in the Columbia canal, and a four foot diameter pipe passing through an existing undeveloped turbine pit and into the tailrace below the powerhouse. Since construction, Kleinschmidt continues to serve SCE&G in addressing diadromous fish issues in the Santee River basin and was a contributor in developing the Santee River Basin Fish Restoration Accord (Accord). The Accord is a mutli-utility agreement developed with state and federal resource agencies to scientifically evaluate fish restoration enhancement efforts to ensure that fishway implementation is based on biological data and established fish population targets.

Client Benefits:

Kleinschmidt’s downstream passage design incorporated the use of an unused turbine pit in the powerhouse which eliminated the need for temporary cofferdams structures in the tailrace resulting in significant project cost savings.