Water Facilities Master Plan December 2015 Rancho California Water District Rancho California Water District Water Facilities Master Plan December 2015 Page 2 of 304 TABLE OF CONTENTS ABBREVIATIONS ........................................................................................................6 EXECUTIVE SUMMARY ................................................................................................8 CHAPTER 1. INTRODUCTION .....................................................................................16 1.1 PURPOSE AND SCOPE ................................................................................16 1.2 STUDY AREA .............................................................................................19 CHAPTER 2. EXISTING WATER SYSTEMS ...................................................................20 2.1 POTABLE WATER SYSTEM ..........................................................................21 2.1.1 Distribution Infrastructure .................................................................... 25 2.2 RECYCLED WATER SYSTEM .......................................................................39 2.2.1 Distribution Infrastructure .................................................................... 41 CHAPTER 3. WATER DEMANDS .................................................................................49 3.1 LAND USE CLASSIFICATION ........................................................................49 3.2 HISTORIC WATER USE ...............................................................................55 3.3 EXISTING WATER DEMANDS .......................................................................62 3.3.1 Comparison to District Production Records ......................................... 65 3.3.2 Recent Trends in Potable Water Demand ........................................... 65 3.4 DUTY FACTORS .........................................................................................69 3.5 BUILD-OUT WATER DEMANDS ....................................................................72 3.6 WATER SERVICE OUTSIDE OF THE DISTRICT’S SERVICE AREA BOUNDARY ..... 85 3.7 POTABLE WATER DEMAND PROJECTIONS BY 5-YEAR INCREMENT ................. 91 3.8 DATA STORAGE FRAMEWORK .....................................................................97 CHAPTER 4. WATER SUPPLY EVALUATION ................................................................98 4.1 IMPORTED WATER ...................................................................................102 4.1.1 Existing Supply Capacity ...................................................................102 4.1.2 Existing Wheeling Capacity Requirements ........................................ 106 4.1.2 Historical Purchases of Imported Water ............................................ 107 4.1.3 Cost ...................................................................................................110 4.1.4 Quality ...............................................................................................110 4.1.5 Reliability ...........................................................................................113 4.1.6 Future Supply Capacity .....................................................................113 4.1.7 Future Wheeling Capacity Requirements .......................................... 114 4.2 GROUND WATER .....................................................................................115 4.2.1 Existing Supply Capacity ...................................................................116 4.2.2 Existing Wheeling Capacity Requirements ........................................ 117 4.2.3 Historical Production .........................................................................117 4.2.4 Cost ...................................................................................................140 4.2.5 Quality ...............................................................................................140 4.2.6 Reliability ...........................................................................................144 4.2.7 Future Supply Capacity .....................................................................144 4.2.8 Future Wheeling Capacity Requirements .......................................... 145 4.3 SURFACE WATER ....................................................................................145 Rancho California Water District Water Facilities Master Plan December 2015 Page 3 of 304 4.3.1 Existing Supply Capacity ...................................................................146 4.3.2 Historical Production .........................................................................151 4.3.3 Cost ...................................................................................................155 4.3.4 Quality ...............................................................................................155 4.3.5 Reliability ...........................................................................................155 4.3.6 Future Supply Capacity .....................................................................155 4.3.7 Future Supply Capacity Alternatives .................................................155 4.4 RECYCLED WATER ..................................................................................158 4.4.1 Existing Supply Capacity ...................................................................158 4.4.2 Existing Wheeling Capacity Requirements ........................................ 159 4.4.3 Historical Production .........................................................................159 4.4.4 Cost ...................................................................................................159 4.4.5 Quality ...............................................................................................160 4.4.6 Reliability ...........................................................................................162 4.4.7 Future Supply Capacity .....................................................................162 4.4.8 Future Wheeling Capacity Requirements .......................................... 163 4.4.9 Future Supply Capacity Alternatives .................................................163 4.5 WATER SUPPLY SUMMARY .......................................................................164 CHAPTER 5. WATER RESOURCE MANAGEMENT .......................................................169 5.1 DEMAND MANAGEMENT MEASURES ..........................................................169 5.2 IMPORTED WATER MANAGEMENT .............................................................174 5.3 OTHER ISSUES ........................................................................................178 5.3.1 Climate Change .................................................................................178 5.3.2 Water Quality .....................................................................................179 5.3.3 Reliability ...........................................................................................179 5.3.4 Peaking .............................................................................................179 5.4 WATER RESOURCE MANAGEMENT ALTERNATIVES ..................................... 185 5.4.1 Description of Alternatives .................................................................185 5.4.2 Evaluation/Ranking of Alternatives ....................................................203 5.4.3 Recommended Water Resource Management Strategy ................... 210 CHAPTER 6. DESIGN CRITERIA ...............................................................................213 6.1 POTABLE WATER SYSTEM DESIGN CRITERIA ............................................. 213 6.1.1 Distribution System Design Criteria ...................................................213 6.1.2 Fire Flow Criteria ...............................................................................216 6.1.3 Peaking Factors ................................................................................216 6.1.4 Pump Station Criteria ........................................................................218 6.1.5 Storage Criteria .................................................................................218 6.1.5.1 Operational Storage ....................................................................... 218 6.1.5.2 Fire Flow Storage ..........................................................................219 6.1.5.3 In-District Emergency Storage ....................................................... 219 6.1.5.4 Reserve Emergency Storage ......................................................... 220 6.2 RECYCLED WATER SYSTEM DESIGN CRITERIA ........................................... 221 6.2.1 Distribution System Design Criteria ...................................................221 Rancho California Water District Water Facilities Master Plan December 2015 Page 4 of 304 6.2.2 Peaking Factors ................................................................................224 6.2.3 Pump Station Criteria ........................................................................226 6.2.4 Storage Criteria .................................................................................226 6.2.4.1 Operational Storage ....................................................................... 226 CHAPTER 7. HYDRAULIC MODEL UPDATES ..............................................................228 7.1 POTABLE WATER DEMAND ALTERNATIVES ................................................ 228 7.1.1 Average Day Demands