EXH0678025066

PCHBPollution Control Hearings Board of the State of Washington

Sent: Friday, April 06, 2001 9:04 AM To: Kenny,Ann; 'Waiters, Katie'; Hellwig, Raymond Cc: 'Whiting, Kelly (King County WLRD)' Subject: stormwater volume perspectives emai_ed Mike Dunwiddie at the KC Aquatic Center in Federal Way and asked him how much water the pool held. Here's what he said: "Our 50 meter competition pool (25 yards wide, depth 9-I0.5 feet) holds 1 million gallons. A more typical, 25 yard, six lane pool holds about a quarter of that." million gallons = 3.07 acre feet. So, if we compare this world-class swimming pool to the ponds that are being considered at the 3RW: Pond D: Volume = 38.3 acre feet = 12.47 Aquatic Center pools Pond F: Volume = 10.3 acre feet = 3.35 Aquatic Center pools - The mother of all vaults = 88 acre ft = 28.66 Aquatic Center pools Kelly Whiting also provided the following: "Erik - We discussed ways to put flow and storage numbers in perspective. Thank you for the information on the olympic size swimming pool. Here are a couple more numbers for perspective. My hydrology instructor always referred to the football field at husky stadium as being an acre. I never knew exactly what part he meant. An NCAA regulation football field is 300 feet by 160 feet (from goalline to goalline and sideline to sideline, no endzones, no sideline areas and no track). This works out to be 48,000 square feet, or 1.1 acres. Therefore an 88 acre-foot vault would be 80 feet of water…
V V