Inside a backflow valve.
Backflow Valve Pilot
Broadview homes that do not currently meet SPU’s standard level of service for sewer drainage during heavy rainstorms are eligible for this pilot project. Homeowners were first asked to allow SPU to evaluate the elevation of their basement drains to determine if they were eligible for the potential installation of a backflow prevention device. These are basically valves that allow flow in only one direction.
What's new
To date, 83% of potential candidates for backflow valves have allowed SPU to conduct basement elevation surveys of their homes, and the survey data is now being used to update our Broadview sewer system modeling. This modeling is critical to determining not just which homes would benefit from the installation of a backflow valve, but will guide us in our decisions regarding how to proceed with long-term sewer improvements. The next step in finalizing the list of eligible homes is to video side sewers to determine exact locations of side sewer pipes, to examine connections and groundwater issues, to decide the best type of device to install, and to locate the best spot for the devices. We hope to finalize our list of eligible homes soon and begin installing valves.
How it will be done
After the elevations of the basements have been determined, and an analysis shows the device is needed to bring up the level of service to SPU standards, the devices will be paid for and installed by SPU. Homeowners will be responsible for maintaining them.
Backwater conditions and location of a backflow valve.
SPU is working to implement this pilot program as quickly as possible. Initial results of the pilot are expected to be available by the end of the first or second quarter of 2012.
For more information
Contact Celia Kennedy, Program Manager, Broadview Sewer and Stormwater System Improvements, at (206) 684-4606 or celia.kennedy@seattle.gov.