Coordinated Water System Plan - Kitsap County Government

Kitsap County May 9, 2005
Coordinated Water System Plan
Regional Supplement 2005 Revision
7.4.1 Peaking Factor
Water system data reported on the surveys were also used to
calculate a peaking factor for water systems in Kitsap County.
A peak day factor was calculated for eight water systems that
reported total and maximum day water supply requirements.
The peaking factor was calculated by dividing maximum day
water supply requirements by the average day requirements.
Water Use: On a
per household
basis, average
daily water use is
356 gpd inside the
UGA and 237 gpd
outside the UGA.
Table 7-5 summarizes the peak day factors for eight water systems in years 1998, 1999,
and 2000, and calculates the average peaking factor of 2.32.
Table 7-5
Peak Day Factors
Water System 1998 1999 2000 3 Year Average
Annapolis W.D. 2.27 2.41 2.51 2.40
City of Bremerton 1.81 1.65 1.75 1.74
Indianola 3.51 2.79 2.97 3.09
Keyport 2.36 2.59 2.43 2.46
North Peninsula 2.16 2.16 2.18 2.17
North Perry W.D. 2.32 NA 2.40 2.36
Silverdale W.D. 2.45 2.00 1.96 2.14
Vinland 2.34 2.28 2.12 2.25
Average 2.40 2.27 2.29 2.32
NA - data is not available
7.4.2 Per Capita and per Household Water Supply Requirement
Projections
The average water supply requirement factors discussed above were applied to the
demographic forecasts in order to develop the water supply requirement projections. The
per capita water supply requirement factors were multiplied by the forecast population to
determine the per capita water supply requirements for 2000-2030. The per household
water supply requirement factors were multiplied by the forecast number of households
to arrive at the per household water supply requirements. Table 7-6 provides a
comparison of the two countywide average day water supply requirement projections,
indicating that the per-household approach yields a higher projection. For the purpose of
this CWSP, the slightly higher projections associated with the per-household approach
have been selected as the base projections used in the other analyses which consider
conservation and additional industrial water supply requirements. Appendix E contains
the detailed water supply requirement projections, organized by method and by subarea.
Table 7-6
Comparison of Per Capita and Per Household Projections (gpd)
Year Per Capita Per Household Difference
2000 26,219,937 26,454,856 234,919
2010 30,314,789 31,696,036 1,381,247
2020 35,098,307 37,738,518 2,640,211
2030 39,229,463 42,559,305 3,329,842
Section 7 - Water Supply Requirements 7-5