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We’ll be making sewer and drainage improvements in Broadview neighborhood.
The Broadview sewer system was installed in the 1950s. The many homes and businesses built in the neighborhood since then have added flows to the system, and many have also connected their downspouts and sump pumps directly to the sewers.
Over time, the sewer pipes have also started to deteriorate, allowing groundwater to enter through cracks and other openings. During heavy rains, the amount of water can overwhelm the system and even cause sewage backups into some homes.
As was customary at the time, a separate, piped system to handle stormwater in the neighborhood was never built. Construction and development have increased the amount of paved areas, while many trees have been removed and overall natural surfaces reduced. Where rainwater used to seep into the ground, it now collects on the surface and moves downhill through ditches and culverts.
Since 2011, Seattle Public Utilities has been working with the community to identify sewer and drainage projects in the areas of Broadview that are most impacted. SPU considered over a dozen options addressing sewer and drainage issues and is pursuing two cost-effective projects. The Dayton Ave N Basin Sewer Project and the 12th Ave NW Basin Drainage Project will focus first on parts of the neighborhood with the highest priority sewer and drainage issues.
When developing and evaluating the preferred sewer and drainage options, SPU considered:
SPU completed two early action pilot projects in the Broadview neighborhood and has initiated two other small projects to help improve drainage conditions and prevent sewer backups.