The Pleasant Valley Pipeline raw water intake carries Poudre River water to water treatment plants to provide a secondary water supply for the City of Fort Collins and three area water districts. Sediment, leaves, pine needles, and pine cones clogged the flow control valves at the treatment plants, requiring costly manual cleaning many times a day. The City retained Ayres Associates to design a technical solution that would eliminate the need for manual cleaning.
The Ayres team considered and rejected many options before recommending a traveling screen system commonly used in screening wastewater. Part of the continuously rotating screen catches debris while the other section is being cleaned by a high-pressure spray bar. The system clears up to 60 million gallons per day with a custom screen with a 1mm aperture to minimize the passage of pine needles and sediment.