For more information about the Regional Infiltration and Inflow Control Program, please contact Kristine Cramer.

Wastewater Treatment Division
King Street Center
Suite 0505
201 South Jackson Street
Seattle, WA 98104

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Graphics

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What is infiltration/inflow (I/I)?

Graphic depicting how infiltration and inflow get into the sewer system.
click image for larger view. Also available as a PDF file
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Maximum calculated 20-year peak infiltration and inflow hourly flow rates in the King County system. The data for the following three maps is based on flow monitoring conducted in 2000/2001 and 2001/2002, documented in the Wet Weather Flow Monitoring reports.

Local agency boundary --
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Also available as Acrobat PDF

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Model basins--
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Also available as Acrobat PDF

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Mini basins --
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Also available as Acrobat PDF