Installing Educator Wells at Climate Pledge Arena in Seattle, WA

An eductor well system was installed to dewater a tunnel and portal alignment for construction of an underground trucking entrance underneath the new Climate Pledge Arena in Seattle, WA. An eductor well system uses a supply header pipe and a return header pipe to lift groundwater from individual eductor wells using a Venturi suction in each eductor well. The return header pipe comes out of each eductor well with more water than entered into the eductor well via the supply header pipe, thus removing groundwater on a net basis. Eductor systems are suited to dewatering heterogeneous or layered hydrogeologic strata that require closely spaced wells, but are too deep for vacuum wellpoints.

Eductor well layout plan surrounding tunneling portal alignment:

Schematic of eductor well construction, with supply and return header pipes, and picture of eductor system: