Made possible by a custom control valve, Bull Run Watershed is now home to a unique, eco-friendly solution for water temperature shock on aquatic residents
By Genevieve Smith
The Bull Run watershed has continuously provided water to Portland since 1895. It also plays an important role in supporting the larger aquatic ecosystem of the Sandy and Lower Columbia rivers, where some of the fish species have been in significant decline.
In order to help the aquatic environment rebound, the Portland Water Bureau (PWB) developed the Bull Run Water Supply Habitat Conservation Plan (HCP) to make the necessary changes to the City’s drinking water operations. Part of the HCP is a water temperature management plan to comply with the Clean Water Act, which is a critical component in the rehabilitation of the fish stock. The problem was that the water temperature of the Sandy River during summer months was too warm, making it difficult for the fish to spawn.
In order to regulate water temperature, a distribution system that would control the amount of cold water entering the system was needed. The control system would need to have the capabilities of measuring flow as well as have the capacity to flow from low flows to upwards of 83000 gpm to make this possible. As the reservoir fill height has an inlet pressure of 45 psi and the water is going into the river at atmospheric pressure, the valve control system also needed to have the capabilities of withstanding a 45 to 0 psi pressure drop. This is when CIMCO, suppliers of waterworks products, brought in Singer Valve to design a control valve system that could handle these stringent requirements.
The solution from Singer was to supply a S106-2SC-PCO-MV-C-AC valve and an MCP-TP Control Panel. Steve Causseaux sales manager for CIMCO said, “The beauty of Singer’s anti-cav technology is that it is contained in the valve itself, so no additional valves are needed, saving money, time, and future maintenance.”
The Anti-cav is comprised of two stainless steel sliding cages that maximize the full flow capacity. This separation allows for consistent uniform entry around the cage area ensuring the vapour bubbles collapse symmetrically towards the center of the anti-cavitation cage.