incorporate the effect of IRWD’s tiered-rate conservation pricing and its other water conservation programs. The factors are derived from historical usage (billing data) and a detailed review of water use factors within the IRWD’s service areas conducted as part of the development of the WRMP. Land use data is used in conjunction with updated water use factors to estimate water requirements through use of a “demand forecasting tool.” Appropriate GIS layers are established to segregate demands for system and storage evaluations. These evaluations are based on system criteria, which are reviewed in detail and updated as part of the planning effort. IRWD land use projections consider future development projects and schedules. The planning information for these development projects are either contained in Sub Area Master Plans (SAMPs) or sites acknowledged by IRWD as potential development areas. Potential development areas are evaluated for appropriate facility planning as IRWD is made aware of them. The following, Table 3-5 and Table 3-6 , provides a brief listing of the known future development projects and associated projected water demands:
Table 3 - 5. IRWD Future Land Use Development Projects: Projected Demands
Projected Potable Demands (AFY)
Projected Recycled Water Demands (AFY)
Estimated Year of Development
Planning Area
Development
Orange Heights
EO-03A
2030
727
198
Orchard Hills (Neighorhoods 1, 3, 4) Tustin Marketplace
I-01,02
2028
464
246
I-04 I-06 I-06 I-33 I-39
2027 2035 2028 2027 2027
177 689 578 140 297
10 74
UC Regents
Portola Springs Lots 103 and 106
301
6
Los Olivos (Phase 2) PA 51 West and East Alton Parcels PA 51 Districts 1,4-6
81
I-51
2030
132
27
I-51
2030 2027 2027 2035 2030 2030 2035 2035 2035 2035 2030
1,412
442
The Meadows Portola Center Tustin Legacy Innovation Park
LF-01
179 156
12
LF-Opp OR-12
0
1,789
724
I-12 I-30 I-35 I-40 I-51 I-51 I-51
76
30
PA 51 Districts 2, 3, 6 Musick Jail Expansion Marine Way East & West PA 51 County of Orange PA 51 Cultural Terrace PA 51 Northern Sector
592
181
1,407
72 34 83
61
146
85
191 675
256
3 - 8
IRWD – 2025 Urban Water Management Plan
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