2025 Orange County Water Demand Projection Model
SF Calibration Factor
MF Calibration Factor
CII Calibration Factor
Irr Calibration Factor
Agency
GSWC Cowan
0.97 1.00 0.98 1.00 1.01 1.01 1.00 0.97 1.00 1.02 1.03 1.00 1.01 1.00 1.03 1.00 0.95 1.07* 1.03 0.96 1.02 1.00 1.07
1.00* 1.43* 1.33*
0.00 0.00 0.55 0.98 0.85* 1.02 1.00 1.10 1.01 0.26 1.08 0.94* 0.99 1.00 1.00 0.61 1.01* 0.00 1.14 1.00 1.04 0.99 1.03
0.91 0.93 0.97 0.80 0.66 1.01 1.00 0.84 1.00 1.08 0.77 1.11 0.64 0.96 1.39 0.83 1.01 1.05 0.66 0.68 0.99 1.05
GSWC Placentia
GSWC Orange
Huntington Beach
0.93
Irvine Ranch WD
0.99* 0.99 1.00 1.00 1.00 1.01 1.01 1.00* 1.00 0.93 1.01 0.99 0.97 0.00 0.99 0.93 1.00 1.17 1.08
La Habra
La Palma
Laguna Beach CWD
Mesa WD
Moulton Niguel Newport Beach
Orange City
San Clemente
San Juan Capistrano
Santa Ana
Santa Margarita WD
Seal Beach
Serrano WD South Coast
Trabuco Canyon WD
Tustin
Westminster
Yorba Linda WD 1.02 *Agencies have several billing sectors within this demand sector and have several different calibration factors in their specific spreadsheet model
Total water use was summed for each sector to derive annual total use for each agency ( Equation 4-2 ).
Equation 4-2
𝐹𝑜𝑟𝑒𝑐𝑎𝑠𝑡 𝑊𝑎𝑡𝑒𝑟 𝑈𝑠𝑒 = ∑
𝐷𝑟𝑖𝑣𝑒𝑟 𝐶𝑜𝑢𝑛𝑡 × 𝑈𝑠𝑒 𝑝𝑒𝑟 𝐷𝑟𝑖𝑣𝑒𝑟 × 𝐶𝑎𝑙𝑖𝑏𝑟𝑎𝑡𝑖𝑜𝑛 ி௨ ௗ ௌ௧௦
Other uses are predominantly low flows and include fire flows, temporary meters, construction and power uses, and losses. Equation 4-3 shows these computed as a fraction of the annual total use after calibration.
(௩ௗ ) ௗ
Equation 4-3
𝑂𝑡ℎ𝑒𝑟 𝑈𝑠𝑒 % =
Table 4-2 quantifies the other uses for each agency.
Table 4-2: Other Uses by Agency
Agency
Other Use (Percent of Volume Billed)
Anaheim
3% 7%
Brea
4-2
Appendix G - 55
Powered by FlippingBook