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EXH AR025066: Email Stormwater Volume Perspectives Third Runway West Ponds

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A 2001 internal email from King County staff puts stormwater storage volumes for the Third Runway project (3RW) into everyday perspective. It compares proposed retention ponds and vaults to familiar landmarks: Pond D would hold the equivalent of over 12 Olympic-size swimming pools, and the largest vault considered (88 acre-feet) would cover a football field with 80 feet of water—roughly an 8-story building. The email also notes that 0.1 cubic feet per second of water flow is equivalent to about five garden hoses running at full pressure.

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Exhibit AR025066. Email from Erik Stockdale to Ann Kenny, Katie Walters, and Raymond Hellwig (cc Kelly Whiting, King County WLRD), dated April 6, 2001, providing stormwater volume comparisons for ponds being considered at the Third Runway West (3RW) project at Sea-Tac Airport. Pond D volume is 38.3 acre feet (12.47 KC Aquatic Center pools); Pond F volume is 10.3 acre feet (3.35 pools); ‘mother of all vaults’ is 88 acre feet (28.66 pools). Kelly Whiting provides additional perspective: 88 acre-foot vault equals 80 feet of water over an NCAA football field (1.1 acres, 48,000 sq ft), equivalent to an 8-story building; garden hose discharge rate is 8 gallons per minute (0.02 cfs), so 0.1 cfs equals 5 garden hoses. References KC Aquatic Center in Federal Way and Husky Stadium.

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