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Your drainage system is composed of several parts, including roof drains, pipes and catch basins, which all typically flow to a detention or infiltration system. The City regulates the maintenance of drainage systems through the Stormwater Code (SMC 22.800-808). In general, a detention system consists of three parts:
Regular inspection and maintenance are necessary for these systems to function as designed. Properly maintained systems prevent flooding, reduce combined sewer overflow events and protect surface water quality. Seattle Public Utilities Environmental Compliance Inspectors evaluate the level of sediment in the system, verify that all necessary components are in place and functioning properly and check to be sure there are no illicit connections to the system.
If your system is in need of maintenance, the Environmental Compliance Inspector will provide you with a map of the property, a list of contractors who perform drainage system maintenance and a list of the required elements in need of repair or maintenance. As the property owner, you are responsible for completing the necessary maintenance within 30 days.