Compared to many cities, the City of Sequim is fortunate to have relatively few flooding problems. Our glacial soils are very good at absorbing stormwater in many areas. However, as many know too well, certain streets and intersections are fully flooded when the infiltration capacity of the ground is exceeded from a downpour.
In 2013-14, Sequim Public Works identified so-called "problem areas" and documented physical and operational stormwater management concerns in a report, "City of Sequim Stormwater Management Needs Assessment (PDF)." (Click title to link to the 3 MB report; the Figures are a separate 6 MB file.) Major findings of the Needs Assessment project were presented to City Council at a study session on March 10, 2014. Click here to see that slideshow.
The study pro-actively addressed the City’s responsibility to protect existing infrastructure and efficiently manage water resources as the urban area grows. Identified needs were prioritized in the 2016 Storm & Surface Water Master Plan.
Another project sponsored by the City in 2009 explored how "Low Impact Development" stormwater requirements might look if the City chose to fully utilize those options. L.I.D., also known as "green infrastructure" (as compared to gray pipelines), focuses on infiltration and is very effective where soils can handle it, as in much of Sequim. See the results of that study (PDF).