2025 Orange County Water Demand Projection Model
10 15 20 25 30 35 40
0 5
SF Density MF Density
Figure 2-5: 2024 Household Density (average households per acre)
Multifamily density can be as much as an order of magnitude (i.e., ten times) higher than single-family density.
2.1.12
Persons per Household
Generally, households with more people tend to use larger amounts of water i.e. “persons per household” is an explanatory variable that is positively correlated with demand. The American Community Survey (ACS) is census-based data that provides information on housing units, total household population, and a breakdown of single-family and multifamily populations. ACS datasets are available at the census tract level. To derive ACS data specific to Orange County water agency boundaries, a geoprocessing approach was implemented to match census tract boundaries with MWDOC’s service area boundaries, as was done for employment data. Using the single-family and multifamily population split, an estimate of persons per household (PPH) for both single-family and multifamily housing was developed based on water agency boundaries Hazen used ACS data because it calculates population in each single-family and multifamily household categories. CDR provides total population. To ensure consistency with the CDR provided housing unit and population data, the ACS-derived single-family and multifamily PPH estimates were calibrated to align with the CDR’s single-family and multifamily housing unit data. The persons per household ratio was calculated separately for single-family and multifamily residences as shown in Figure 2-6 .
2-16
Appendix G - 35
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