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EXH 268: Summary Table Miller Creek, Walker Creek, Des Moines Creek Drainage Areas STIA Impervious Area Change 1994 Baseline vs 2006 Future Conditions

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Sea-Tac Airport
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This table from a July 2001 Comprehensive Stormwater Management Plan summarizes drainage area measurements and changes in impervious surfaces (such as pavement and rooftops) across Miller Creek, Walker Creek, and Des Moines Creek watersheds at Seattle-Tacoma International Airport (STIA). It compares 1994 baseline conditions to projected 2006 future conditions, showing a total increase of approximately 305.7 acres of impervious area across all drainage basins. The data was compiled from GIS coverage to support stormwater management planning for the airport's master plan update.

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Notes

Exhibit 268 (AR 019498) from the PCHB Third Runway EIS administrative record. Table 4-1 from the Comprehensive Stormwater Management Plan, STIA Master Plan Update Improvements (July 2001, document 556-2912-001(28)). Provides drainage subbasin acreage data for Miller Creek, Walker Creek, and Des Moines Creek at Seattle-Tacoma International Airport, comparing 1994 baseline pervious and impervious areas against 2006 future conditions. Subbasins tabulated include SDN1, SDN1LWR, SDN1OFF, SDN2Xn, SDN3, SDN3A, SDN3X, SDN4, SDN4X, SDW1A, SDW1B, NEPL, CARGO, SDW2, M8, M9, SDE4, SDS1, SDS2, SDS3, SDS3A, SDS4, SDS5, SDS6, SDS7, SASA, NCPS, NSMPS, NSPS, Primary. Total increase in impervious area across all drainages is 305.7 acres. Impervious area includes impervious surfaces, lakes, and detention ponds. Filed as Exhibit 268 dated 2-6-02 in PCHB proceedings.

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