Draft 2025 Urban Water Management Plan

2025 Orange County Water Demand Projection Model

5.1.2

Alternative Forecasts

The dry warm, and wet cool CMIP6 scenarios are depicted relative to historical Orange County demands in Figure 5-4 .

700,000

650,000

600,000

550,000

Dry Warm Scenario

500,000

Wet Cool Scenario

450,000

Historical

Baseline Normal Year

Dry Warm: KACE-1-0-G_585

Wet Cool: FGOALS-g3_585

Figure 5-4: Future CMIP6 Scenarios

To create a possible envelope of demands with only two additional (non-baseline) forecasts, a long-term price increase (in addition to inflation) was imposed on the wet-cool simulation to illustrate additional price pressure (i.e., further decrease in demands). The price increase was assumed to be 3% per year for the entire forecast period. Figure 5-5 shows that the general increases in demand are suppressed when price increases are included in the forecast.

5-5

Appendix G - 68

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