2025 Orange County Water Demand Projection Model
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Figure 3-3: Modeled vs Historical Water Use per Account for Multifamily for an Agency
Multifamily use is generally less responsive to weather than the single-family demands; some of the outdoor use has been shifted over into the irrigation sector, and the reported multifamily use is primarily indoor.
3.5 CII Regression Development Different billing classification schemes among retail agencies introduced definitional uncertainty in sectoral water use and driver units. For example, certain agencies lacked a distinct industrial billing classification while others combined commercial and institutional categories. Additional verification of water use at the account level was not possible, given the data constraints for this project. In response to these constraints and uncertainties, total use within the commercial, industrial, and institutional sectors was consolidated into a single composite CII regression. The benefit of combining these classifications is a more “parsimonious representation” (i.e., a simpler, clearer approach) with one sector, while providing a means to use the mix of industries to explain CII water-use variability across retail agencies.
3.5.1
Explanatory Variables and Fitted Coefficients
Explanatory variables for the final CII regression equation, along with their coefficients, are reported in Table 3-5 .
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Appendix G - 48
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