Pinnacle Foods Stormwater Infiltration System Assessment

(Tacoma, WA)  Landau Associates developed options for re-routing onsite storm drainage basins and conveyance at the former Birds Eye Foods facility from the City of Tacoma (City) sanitary sewer system to the City’s dedicated stormwater conveyance system. We identified the onsite stormwater basins and sources that needed to be addressed, provided estimated areas and associated flows, provided potential re-route options, and presented preliminary cost estimates for the assessed options. Onsite drainage basin areas were efficiently mapped using AutoCAD, and flows were estimated using the Rational Methodology. At the City’s request, we performed a downstream analysis of two storm drainage basins using the Santa Barbara Urban Hydrograph (SBUH) methodology to estimate the City’s conveyance systems capacity assuming full build-out of each drainage basin.