2025 Orange County Water Demand Projection Model
Agency staff provided additional information (via email and phone conversations) to support parsing landscape and recycled water use into modeled sectors. Figure 2-2 shows the agency billing classes separated into the four modeled sectors and the Other category.
35
Single family Sector Multi-family sector CII Sector Irrigation Sector Other
30
25
20
15
10
5
0
Figure 2-2: Billing Sectors by standardized demand sector
Figure 2-2 indicates that across all agencies, single-family and multifamily use were the most consistently classified.
2.1.2
Standardized Agency Rate of Use
Retail agencies have different billing and meter reading frequencies. Additionally, within each agency, meter reading cycles can vary by customer. Many agencies universally adopt either monthly or bimonthly billing; however, some utilize a combination of the two billing cycles depending on customer class and date. Water use rates for the different agency billing cycles were standardized to a calendar-month to better reflect the actual seasonal timing of water use for each of the four modeled sectors (other uses are applied as a percentage of total use across the single-family, multifamily, CII, and irrigation sectors). Water use billed at monthly intervals can generally overlap with two consecutive calendar months. A smoothing equation extracts a single calendar-month use from the two monthly billing periods. For example, April water use is equal to the fraction of the April consumption billed in April plus the fraction of the April consumption billed in May ( Equation 2-1 ).
௨௧௦ ௨௧௦ାெ௬ ௨௧௦
𝐴𝑝𝑟𝑖𝑙 𝑈𝑠𝑒 = ቀ𝐵𝑖𝑙𝑙𝑒𝑑 𝐴𝑝𝑟𝑖𝑙 𝐶𝑜𝑛𝑠𝑢𝑚𝑝𝑡𝑖𝑜𝑛×
ቁ+
ெ௬ ௨௧௦ ௨௧௦ା ௨௧௦ ቁ
ቀ𝐵𝑖𝑙𝑙𝑒𝑑 𝑀𝑎𝑦 𝐶𝑜𝑛𝑠𝑢𝑚𝑝𝑡𝑖𝑜𝑛 ×
Equation 2-1
2-4
Appendix G - 23
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