In computer science, concurrency means doing more than one thing at a time. Words synonymous with concurrency include “parallelism” or “simultaneous occurrence.” Concurrency is the ability to walk and chew gum at the same time.
In the context of city growth and housing development, we are using concurrency to mean that publicly owned infrastructure (bridges, roads, transportation, schools, utilities, parks) should be built, managed, and above all, keep up with development of new housing capacity.
As defined by the Washington State Department of Transit (WSDOT), concurrency is one of 14 goals identified in the Growth Management Act (GMA) . According to the GMA, achievement of concurrency is when adequate public facilities are in place and functioning at the adopted level-of-service (LOS) at the time development occurs.
In WSDOT’s application of the GMA above, “the adopted LOS serves as the local jurisdiction’s standard to measure the impacts new development would have on the local transportation system.”
Therefore, If Seattle City government officials (specifically Planning and Development) decided that any permit request would result in the LOS dropping below the standard, the City must change the standard or deny the development application.
This is not happening in Seattle, which has resulted in a decline in infrastructure needs as development is exploding. Further development must be concurrent with infrastructure growth and upgrades.