October 30, 2001August 2, 2026

Notes on HSPF Modeling of Miller, Walker and Des Moines Creeks: Linkages Between HSPF and Hydrus/Slice

Notes

Technical notes from Hydrocomp, Inc. (authored by Norm Crawford) describing the linkages between HSPF and Hydrus/Slice models for stormwater and groundwater modeling at Sea-Tac Airport’s new runway and taxiway areas. The document outlines how pervious and impervious land surfaces are modeled, how water moves through fill material and Vashon till, and provides eight recommended steps for additional model runs. Additional issues are identified regarding area discrepancies and lost baseflows in the HSPF model.

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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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