2013 Water System Plan, Volume II - Seattle City Clerk's Office - City ...

Components of Actual and Forecast Water Demand
All figures in millions of gallons per day (MGD)
Billed Demand
Non- Total System Demand
Year Seattle Retail
Wholesale
Revenue Annual Peak
SF Res MF Res Non-Res Subtotal F&P 1 Block 2 New 3 Subtotal Water Average 4 Day 5
2000 26.9 14.5 27.7 69.1 34.3 31.7 - 66.0 13.2 148.2 241.9
2001 24.0 13.7 24.6 62.3 30.0 30.8 - 60.7 11.6 134.6 204.0
A 2002 24.8 13.1 24.9 62.8 32.9 31.0 - 63.9 9.8 136.5 222.6
C 2003 24.9 12.8 24.6 62.3 35.6 32.7 - 68.2 9.4 139.9 250.2
T 2004 24.2 12.5 24.6 61.3 33.1 33.3 - 66.4 14.0 141.7 246.8
U 2005 22.6 12.2 23.2 58.0 29.6 31.4 - 61.0 7.7 126.7 210.4
A 2006 23.5 12.3 23.7 59.5 32.0 33.4 - 65.4 6.3 131.2 236.8
L 2007 22.6 12.0 23.6 58.3 28.7 33.7 - 62.5 5.2 125.9 227.6
2008 22.0 11.8 22.5 56.3 28.8 32.0 - 60.8 8.2 125.3 202.0
2009 23.1 11.6 22.6 57.3 30.6 34.1 - 64.8 7.5 129.5 241.9
2010 21.3 11.4 21.6 54.3 26.5 29.6 - 56.1 8.0 118.4 197.9
2010 21.9 11.4 21.6 55.0 28.0 41.9 0.0 69.9 8.0 132.8 265.7
2011 21.5 11.5 21.2 54.2 28.2 41.9 0.0 70.1 8.0 132.3 264.7
2012 21.2 11.6 21.0 53.8 28.1 41.9 0.1 70.0 8.1 131.9 263.8
F 2013 20.9 11.6 20.8 53.3 27.9 41.9 0.1 69.9 8.1 131.3 262.6
O 2014 20.7 11.7 20.7 53.0 28.1 41.9 0.2 70.1 8.2 131.2 262.5
R 2015 20.4 11.7 20.6 52.8 28.1 41.9 0.2 70.2 8.2 131.2 262.3
E 2016 20.3 11.8 20.9 53.0 27.3 41.9 0.3 69.4 8.2 130.6 261.3
C 2017 20.2 11.8 21.1 53.2 26.5 41.9 0.3 68.6 8.3 130.1 260.1
A 2018 20.1 11.9 21.3 53.3 26.6 43.9 0.4 70.8 8.3 132.4 264.8
S 2019 19.9 12.0 21.5 53.4 26.8 43.9 0.4 71.0 8.4 132.7 265.5
T 2020 19.7 12.0 21.7 53.5 26.9 43.9 0.5 71.2 8.4 133.1 266.2
2021 19.5 12.1 22.0 53.6 26.9 43.9 0.5 71.3 8.4 133.3 266.7
2022 19.3 12.1 22.3 53.7 27.0 43.9 0.6 71.4 8.5 133.6 267.2
2023 19.1 12.1 22.6 53.9 27.0 43.9 0.6 71.5 8.5 133.9 267.7
2024 18.9 12.2 22.9 54.0 27.1 33.9 0.7 61.6 8.6 124.1 248.3
2025 18.7 12.2 23.2 54.2 27.1 33.9 0.7 61.7 8.6 124.5 248.9
2026 18.5 12.3 23.5 54.3 27.2 33.9 0.8 61.8 8.6 124.8 249.5
2027 18.3 12.3 23.8 54.5 27.2 33.9 0.8 61.9 8.7 125.1 250.1
2028 18.1 12.4 24.1 54.6 27.3 33.9 0.9 62.0 8.7 125.4 250.7
2029 18.0 12.5 24.3 54.8 27.4 33.9 0.9 62.1 8.8 125.7 251.3
2030 17.8 12.5 24.6 54.9 27.5 28.9 0.9 57.3 8.8 121.0 241.9
2031 17.7 12.7 25.0 55.4 27.8 28.9 1.0 57.6 8.8 121.8 243.6
2032 17.7 12.9 25.4 55.9 28.1 28.9 1.0 57.9 8.9 122.7 245.4
2033 17.6 13.0 25.8 56.4 28.4 28.9 1.0 58.2 8.9 123.6 247.1
2034 17.6 13.2 26.1 57.0 28.7 28.9 1.0 58.5 9.0 124.4 248.9
2035 17.6 13.4 26.5 57.5 29.0 23.9 1.0 53.9 9.0 120.3 240.7
2036 17.5 13.6 26.9 58.0 29.3 23.9 1.0 54.2 9.0 121.3 242.5
2037 17.5 13.8 27.3 58.6 29.7 23.9 1.0 54.5 9.1 122.2 244.4
2038 17.5 13.9 27.7 59.2 30.1 23.9 1.0 54.9 9.1 123.2 246.4
2039 17.5 14.1 28.1 59.7 30.4 23.9 1.0 55.3 9.2 124.2 248.3
2040 17.5 14.3 28.5 60.3 30.8 18.9 1.0 50.6 9.2 120.2 240.3
5 2045 17.6 15.2 29.4 62.2 32.5 13.9 1.0 47.4 9.4 119.0 237.9
2050 17.8 16.1 30.4 64.3 34.6 13.9 1.0 49.4 9.6 123.3 246.5
Y 2055 18.0 17.3 31.4 66.6 36.8 13.9 1.0 51.7 9.8 128.1 256.2
R 2060 18.2 18.6 32.4 69.2 39.3 13.9 1.0 54.1 10.0 133.4 266.8
1. F&P refers to Full and Partial contracts wholesale customers.
2. The forecast of demand from Cascade Water Alliance (Cascade) and Northshore is equal to their blocks while the historical consumption data
reflects water actually purchased from SPU by Cascade members and Northshore. The blocks exceeded actual water purchases from SPU of
Cascade members and Northshore by 12 mgd in 2010.
3. Potential new wholesale customers
4. The forecast of Total System Demand includes the Northshore and Cascade blocks while the historical consumption data reflects SPU water
actually purchased by Northshore and Cascade.
5. The forecast of peak day demand is based on a peak day factor of 2.0, the ratio of peak day to average annual demand in 2009 with a 5%
allowance for hot, dry weather. The forecast of average annual demand under average weather conditions is multiplied by the peak day factor
to estimate peak day demand with hot, dry weather.
FINAL Page 11 of 22 December 2011