Case Study
Johnston County Raw Water Reservoir, NC
EFI installed a 307,661-square-foot permeable cover and a floating baffle at Johnston County's raw water reservoir in 2003.
Historical scope checked against the original EFI Johnston County case history on September 23, 2026. The source includes 2003 algae-count and historical pH charts; those observations are not a claim that algae were eliminated or that current water quality is unchanged.
Historical record reviewed .
The Challenge
Problem
Johnston County's raw water basins experienced seasonal algae blooms that raised pH and turbidity and reduced filter run times. The original case history describes previous attempts to control algae using copper sulfate and fish before the reservoir cover was installed.
Our Approach
Solution
Environmental Fabrics, Inc. installed a 307,661-square-foot cover made from 15 mm 3R Foam over approximately three-fourths of the reservoir. A 420-foot by 14-foot floating baffle made from 30 mil XR-5 was attached to the open edge of the cover. The cover was intended to limit sunlight and the baffle to increase basin retention time. The original case history records work beginning in February 2003 and finishing on schedule in March while the plant remained operational.
Historical record
Documented Scope
Project Details
- 307,661-square-foot permeable cover installed
- 420-foot by 14-foot floating baffle installed
- 15 mm 3R Foam cover and 30 mil XR-5 baffle materials
- Plant remained operational during the February-March 2003 installation, according to the case history
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