Work started on the first CSO projects in These Cornerstone Projects were designed to remove as much stormwater runoff as possible from combined sewers, which allowed engineers to design smaller, less expensive facilities to collect and convey combined sewage. Today the stream diversion, sewer separation, sump installation and downspout disconnection projects remove an average of 2.
Downspout disconnections alone remove an average of 1. Construction of larger projects began in with the Columbia Slough Big Pipe, a 3. Portland United. To find information not yet moved, visit the Environmental Services pages on portlandoregon. In a combined system, sewage and stormwater are carried in the same pipes to the treatment plant. Before the Big Pipe Project was completed in , these neighborhood pipes used to fill up and overflow to the Willamette River or Columbia Slough when it rained.
Now the Big Pipe Project has eliminated 94 percent of overflows to the Willamette and 99 percent to the slough. Carry E. Coli bacteria that can be harmful to people, which is why people are advised to avoid contact with the water for 48 hours after an overflow. Environmental Services is moving information to Portland. December Total number of hours for the overflow: 2. Total volume of overflow: About 2 million gallons for context, the wastewater treatment plant received and treated million gallons of stormwater and sewage for the 48 hour period of Dec.
Follow the Big Pipe Tracker to see current conditions. Original advisory: A wintery mix of heavy rain and snow overnight led the Big Pipe system to reach capacity in containing combined stormwater and sewage. An overflow to the Willamette River began about 2 a. During an overflow, and for 48 hours afterwards, the public is advised to avoid contact with the river because of increased bacteria in the water.
CSOs are rare and can occur during periods of heavy rain or snowfall. This is the fifth overflow of
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