October 22, 2002August 2, 2026

Miller Creek Below ROF Future Conditions: Lowest Monthly Mean Flow Analysis and 2-Year/72-Hour Storm Daily Flows

Notes

This document presents a frequency analysis of the lowest monthly mean flows (August-May) for Miller Creek below ROF, covering 48 years of data ranked by flow magnitude, with a 5-year return period mean low flow of approximately 0.60 cfs. A second page presents daily and hourly flow data from a 2-year/72-hour storm event in August 1996, including effluent and receiving water flows for acute and chronic water quality standards analysis.

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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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