14.B.
2025 UWMP PH - Page 2 of 2
14.B.
APPENDIX E
AWWA Water Loss Audit Reports
2025 URBAN WATER MANAGEMENT PLAN
For the City of Hemet
July 2026
14.B.
Water Audit Report for:
Reporting Year:
All volumes to be entered as: ACRE-FEET PER YEAR
Master Meter and Supply Error Adjustments
WATER SUPPLIED Pcnt: Value:
Volume from own sources: 7 1,967.000 acre-ft/yr 3 0.00% acre-ft/yr Water imported: 5 1,779.000 acre-ft/yr 3 acre-ft/yr
Water exported: n/a 0.000 acre-ft/yr acre-ft/yr
Enter negative % or value for under-registration
WATER SUPPLIED: 3,746.000 acre-ft/yr Enter positive % or value for over-registration .
AUTHORIZED CONSUMPTION
Billed metered: 5 3,604.000 acre-ft/yr
Billed unmetered: n/a acre-ft/yr
Unbilled metered: n/a acre-ft/yr Pcnt: Value:
Unbilled unmetered: 10 7.180 acre-ft/yr ͳǤʹͷΨ acre-ft/yr AUTHORIZED CONSUMPTION: 3,611.180 acre-ft/yr
WATER LOSSES (Water Supplied - Authorized Consumption) 134.820 acre-ft/yr Apparent Losses Pcnt: Value:
Unauthorized consumption: 9.365 acre-ft/yr 0.25% acre-ft/yr Customer metering inaccuracies: 3 18.111 acre-ft/yr 0.50% acre-ft/yr Systematic data handling errors: 5 9.010 acre-ft/yr 0.25% acre-ft/yr Apparent Losses: 36.486 acre-ft/yr
Real Losses (Current Annual Real Losses or CARL)
Real Losses = Water Losses - Apparent Losses: 98.334 acre-ft/yr WATER LOSSES: 134.820 acre-ft/yr
NON-REVENUE WATER
NON-REVENUE WATER: 142.000 acre-ft/yr
= Water Losses + Unbilled Metered + Unbilled Unmetered
SYSTEM DATA
Length of mains: 7 132.3 miles
Number of active AND inactive service connections: 9 9,325 Service connection density: 70 conn./mile main
Yes
Average length of customer service line:
Average operating pressure: 5 80.0 psi
COST DATA
Total annual cost of operating water system: 9 $10,983,300 $/Year Customer retail unit cost (applied to Apparent Losses): 10 $4.79 Variable production cost (applied to Real Losses): 3 $300.00 $/acre-ft WATER AUDIT DATA VALIDITY SCORE:
PRIORITY AREAS FOR ATTENTION:
1: Water imported
2: Customer metering inaccuracies
3: Variable production cost (applied to Real Losses)
Based on the information provided, audit accuracy can be improved by addressing the following components:
$/100 cubic feet (ccf)
Default option selected for unauthorized consumption - a grading of 5 is applied but not displayed *** YOUR SCORE IS: 60 out of 100 ***
A weighted scale for the components of consumption and water loss is included in the calculation of the Water Audit Data Validity Score Default option selected for Systematic data handling errors - a grading of 5 is applied but not displayed Average length of customer service line has been set to zero and a data grading score of 10 has been applied Are customer meters typically located at the curbstop or property line? AWWA Free Water Audit Software:
Reporting Worksheet
7.180
2020 7/2019 - 6/2020
City of Hemet Water Department (3310016)
<----------- Enter grading in column 'E' and 'J' ----------> ?
?
?
?
?
? Click to access definition
?
?
?
?
?
?
Please enter data in the white cells below. Where available, metered values should be used; if metered values are unavailable please estimate a value. Indicate your confidence in the accuracy of the input data by grading each component (n/a or 1-10) using the drop-down list to the left of the input cell. Hover the mouse over the cell to obtain a description of the grades ?
?
?
?
?
?
(length of service line, beyond the property
boundary, that is the responsibility of the utility)
Use buttons to select
percentage of water
supplied
OR
value
Click here: ?
for help using option
buttons below
?
?
?
?
+
+ Click to add a comment
WAS v5.0
+
+
+
+
+
+
American Water Works Association.
Copyright © 2014, All Rights Reserved.
?
?
?
+
+
+
+
+
+
+
+
+
+
+
+
+
?
To select the correct data grading for each input, determine the highest grade where the utility meets or exceeds all criteria for that grade and all grades below it.
Use Customer Retail Unit Cost to value real losses
14.B.
Water Audit Report for:
Reporting Year:
All volumes to be entered as: ACRE-FEET PER YEAR
Master Meter and Supply Error Adjustments
WATER SUPPLIED Pcnt: Value:
Volume from own sources: 5 2,832.400 acre-ft/yr 3 0.00% acre-ft/yr Water imported: 5 1,182.770 acre-ft/yr 3 acre-ft/yr
Water exported: n/a 0.000 acre-ft/yr acre-ft/yr
Enter negative % or value for under-registration
WATER SUPPLIED: 4,015.170 acre-ft/yr Enter positive % or value for over-registration .
AUTHORIZED CONSUMPTION
Billed metered: 7 3,955.810 acre-ft/yr
Billed unmetered: n/a acre-ft/yr
Unbilled metered: n/a acre-ft/yr Pcnt: Value:
Unbilled unmetered: 10 1.640 acre-ft/yr ͳǤʹͷΨ acre-ft/yr AUTHORIZED CONSUMPTION: 3,957.450 acre-ft/yr
WATER LOSSES (Water Supplied - Authorized Consumption) 57.720 acre-ft/yr Apparent Losses Pcnt: Value:
Unauthorized consumption: 5 9.890 acre-ft/yr ͲǤʹͷΨ acre-ft/yr Customer metering inaccuracies: 4 19.878 acre-ft/yr 0.50% acre-ft/yr Systematic data handling errors: 5 9.890 acre-ft/yr 0.25% acre-ft/yr Apparent Losses: 39.657 acre-ft/yr
Real Losses (Current Annual Real Losses or CARL)
Real Losses = Water Losses - Apparent Losses: 18.063 acre-ft/yr WATER LOSSES: 57.720 acre-ft/yr
NON-REVENUE WATER
NON-REVENUE WATER: 59.360 acre-ft/yr
= Water Losses + Unbilled Metered + Unbilled Unmetered
SYSTEM DATA
Length of mains: 7 132.3 miles
Number of active AND inactive service connections: 9 9,325 Service connection density: 70 conn./mile main
Yes
Average length of customer service line:
Average operating pressure: 5 80.0 psi
COST DATA
Total annual cost of operating water system: 9 $10,897,900 $/Year Customer retail unit cost (applied to Apparent Losses): 10 $4.79 Variable production cost (applied to Real Losses): 3 $300.00 $/acre-ft WATER AUDIT DATA VALIDITY SCORE:
PRIORITY AREAS FOR ATTENTION:
1: Volume from own sources
2: Variable production cost (applied to Real Losses)
3: Customer metering inaccuracies
Based on the information provided, audit accuracy can be improved by addressing the following components:
$/100 cubic feet (ccf)
*** YOUR SCORE IS: 60 out of 100 ***
A weighted scale for the components of consumption and water loss is included in the calculation of the Water Audit Data Validity Score
9.890
Default option selected for Systematic data handling errors - a grading of 5 is applied but not displayed Average length of customer service line has been set to zero and a data grading score of 10 has been applied Are customer meters typically located at the curbstop or property line? AWWA Free Water Audit Software:
Reporting Worksheet
1.640
2021 7/2020 - 6/2021
City of Hemet (CA3310016)
<----------- Enter grading in column 'E' and 'J' ----------> ?
?
?
?
?
? Click to access definition
?
?
?
?
?
?
Please enter data in the white cells below. Where available, metered values should be used; if metered values are unavailable please estimate a value. Indicate your confidence in the accuracy of the input data by grading each component (n/a or 1-10) using the drop-down list to the left of the input cell. Hover the mouse over the cell to obtain a description of the grades ?
?
?
?
?
?
(length of service line, beyond the property
boundary, that is the responsibility of the utility)
Use buttons to select
percentage of water
supplied
OR
value
Click here: ?
for help using option
buttons below
?
?
?
?
+
+ Click to add a comment
WAS v5.0
+
+
+
+
+
+
American Water Works Association.
Copyright © 2014, All Rights Reserved.
?
?
?
+
+
+
+
+
+
+
+
+
+
+
+
+
?
To select the correct data grading for each input, determine the highest grade where the utility meets or exceeds all criteria for that grade and all grades below it.
Use Customer Retail Unit Cost to value real losses
14.B.
Water Audit Report for:
Reporting Year:
All volumes to be entered as: ACRE-FEET PER YEAR
Master Meter and Supply Error Adjustments
WATER SUPPLIED Pcnt: Value:
Volume from own sources: 5 1,488.090 acre-ft/yr 8 0.00% acre-ft/yr Water imported: 5 2,525.950 acre-ft/yr 8 0.00% acre-ft/yr Water exported: n/a 0.000 acre-ft/yr acre-ft/yr
Enter negative % or value for under-registration
WATER SUPPLIED: 4,014.040 acre-ft/yr Enter positive % or value for over-registration .
AUTHORIZED CONSUMPTION
Billed metered: 8 3,994.300 acre-ft/yr
Billed unmetered: n/a 0.000 acre-ft/yr
Unbilled metered: n/a 0.000 acre-ft/yr Pcnt: Value:
Unbilled unmetered: 10 2.910 acre-ft/yr ͳǤʹͷΨ acre-ft/yr AUTHORIZED CONSUMPTION: 3,997.210 acre-ft/yr
WATER LOSSES (Water Supplied - Authorized Consumption) 16.830 acre-ft/yr Apparent Losses Pcnt: Value:
Unauthorized consumption: 10.035 acre-ft/yr 0.25% acre-ft/yr Customer metering inaccuracies: 5 20.072 acre-ft/yr 0.50% acre-ft/yr Systematic data handling errors: 5 4.993 acre-ft/yr ͲǤʹͷΨ acre-ft/yr Apparent Losses: 35.100 acre-ft/yr
Real Losses (Current Annual Real Losses or CARL)
Real Losses = Water Losses - Apparent Losses: -18.270 acre-ft/yr WATER LOSSES: 16.830 acre-ft/yr
NON-REVENUE WATER
NON-REVENUE WATER: 19.740 acre-ft/yr
= Water Losses + Unbilled Metered + Unbilled Unmetered
SYSTEM DATA
Length of mains: 7 132.3 miles
Number of active AND inactive service connections: 9 9,772 Service connection density: 74 conn./mile main
Yes
Average length of customer service line:
Average operating pressure: 7 80.0 psi
COST DATA
Total annual cost of operating water system: 10 $10,203,700 $/Year Customer retail unit cost (applied to Apparent Losses): 9 $4.79 Variable production cost (applied to Real Losses): 9 $301.48 $/acre-ft WATER AUDIT DATA VALIDITY SCORE:
PRIORITY AREAS FOR ATTENTION:
1: Water imported
2: Volume from own sources
3: Customer metering inaccuracies
AWWA Free Water Audit Software:
Reporting Worksheet
2.910
2021 7/2021 - 6/2022
City of Hemet Water Department (CA3310016)
<----------- Enter grading in column 'E' and 'J' ----------> Based on the information provided, audit accuracy can be improved by addressing the following components:
$/100 cubic feet (ccf)
Default option selected for unauthorized consumption - a grading of 5 is applied but not displayed Check input values; APPARENT LOSSES should be less than WATER LOSSES
4.993
*** YOUR SCORE IS: 67 out of 100 ***
A weighted scale for the components of consumption and water loss is included in the calculation of the Water Audit Data Validity Score Average length of customer service line has been set to zero and a data grading score of 10 has been applied Are customer meters typically located at the curbstop or property line? ?
?
?
?
?
? Click to access definition
?
?
?
?
?
?
Please enter data in the white cells below. Where available, metered values should be used; if metered values are unavailable please estimate a value. Indicate your confidence in the accuracy of the input data by grading each component (n/a or 1-10) using the drop-down list to the left of the input cell. Hover the mouse over the cell to obtain a description of the grades ?
?
?
?
?
?
(length of service line, beyond the property
boundary, that is the responsibility of the utility)
Use buttons to select
percentage of water
supplied
OR
value
Click here: ?
for help using option
buttons below
?
?
?
?
+
+ Click to add a comment
WAS v5.0
+
+
+
+
+
+
American Water Works Association.
Copyright © 2014, All Rights Reserved.
?
?
?
+
+
+
+
+
+
+
+
+
+
+
+
+
?
To select the correct data grading for each input, determine the highest grade where the utility meets or exceeds all criteria for that grade and all grades below it.
Use Customer Retail Unit Cost to value real losses
Ψ
%
%
14.B.
Water Audit Report for:
Audit Year:
All volumes to be entered as: ACRE-FEET PER YEAR
WATER SUPPLIED choose entry option:
VOS Volume from Own Sources: n g 7 2,591.620 Acre-ft/Yr n g 8 percent acre-ft/yr under-registration VOSEA WI Water Imported: n g 7 1,042.190 Acre-ft/Yr n g 5 percent acre-ft/yr select….. WIEA WE Water Exported: n g n/a 0.000 Acre-ft/Yr n g n/a percent acre-ft/yr select….. WEEA 3,633.810 Acre-ft/Yr
.
AUTHORIZED CONSUMPTION
BMAC Billed Metered: n g 5 3,615.610 Acre-ft/Yr
BUAC Billed Unmetered: n g n/a Acre-ft/Yr
UMAC Unbilled Metered: n g 4 5.580 Acre-ft/Yr choose entry option:
UUAC Unbilled Unmetered: n g 3 9.039 Acre-ft/Yr 0.25% custom acre-ft/yr Enter a positive value, otherwise a default of 0.25% x (BMAC+BUAC) is applied with grading of 3 3,630.229 Acre-ft/Yr
WATER LOSSES 3.581 Acre-ft/Yr
Apparent Losses
Default option selected for Systematic Data Handling Errors, with automatic data grading of 3 choose entry option:
SDHE Systematic Data Handling Errors: n g 3 9.039 Acre-ft/Yr 0.25% default acre-ft/yr CMI Customer Metering Inaccuracies: n g 3 0.000 Acre-ft/Yr 0.00% percent acre-ft/yr under-registration UC Unauthorized Consumption: n g 3 9.039 Acre-ft/Yr 0.25% default acre-ft/yr Default option selected for Unauthorized Consumption, with automatic data grading of 3
18.078 Acre-ft/Yr
Real Losses
-14.497 Acre-ft/Yr
3.581 Acre-ft/Yr
NON-REVENUE WATER
18.200 Acre-ft/Yr
SYSTEM DATA
Lm Length of mains: n g 3 132.0 miles (including fire hydrant lead lengths) Nc Number of service connections: n g 5 9,841 (active and inactive) Service connection density: 75 conn./mile main
Yes
Lp Average length of (private) customer service line: n g 10 (average distance between property line and meter) AOP Average Operating Pressure: n g 7 80.0 psi
COST DATA
CRUC Customer Retail Unit Charge: n g 9 $4.79
VPC Variable Production Cost: n g 3 $301.48 $/acre-ft $/yr (optional input) WATER AUDIT DATA VALIDITY TIER:
go to
dashboard
PRIORITY AREAS FOR ATTENTION TO IMPROVE DATA VALIDITY: KEY PERFORMANCE INDICATOR TARGETS:
Based on the information provided, audit reliability can be most improved by addressing the following components: OPTIONAL: If targets exist for the operational performance indicators, they can be input below:
1: Billed Metered (BMAC) Unit Total Losses: gal/conn/day 2: Volume from Own Sources (VOS) Unit Apparent Losses: gal/conn/day 3: Customer Metering Inaccuracies (CMI) Unit Real LossesA : gal/conn/day
Unit Real LossesB: gal/mile/day
If entered above by user, targets will display on KPI gauges (see Dashboard) Are customer meters typically located at the curbstop/property line? AWWA Free Water Audit Software:
Worksheet
City of Hemet
Jul 01 2022 - Jun 30 2023
Water Supplied Error Adjustments
2023 Fiscal
Real Losses:
WATER LOSSES:
Average length of customer service line has been set to zero and a data grading of 10 has been applied A weighted scale for the components of supply, consumption and water loss is included in the calculation of the Water Audit Data Validity Score *** The Water Audit Data Validity Score is in Tier III (51-70). See Dashboard tab for additional outputs. *** $/100 cubic feet (ccf)
$12,483,900
Total Annual Operating Cost
go to start page
NON-REVENUE WATER:
If entering an
Error Adjustment,
select under- or overregistration
Check input values; APPARENT LOSSES should be less than WATER LOSSES WATER SUPPLIED:
AUTHORIZED CONSUMPTION:
Apparent Losses:
Click 'g' to determine data validity grade
Click 'n' to add notes
FWAS v6.0
American Water Works Association.
Copyright © 2020, All Rights Reserved.
To access definitions, click the input name
To edit water system info:
14.B.
Water Audit Report for:
Audit Year:
All volumes to be entered as: ACRE-FEET PER YEAR
WATER SUPPLIED choose entry option:
VOS Volume from Own Sources: n g 7 2,335.310 Acre-ft/Yr n g 8 percent acre-ft/yr under-registration VOSEA WI Water Imported: n g 7 1,384.090 Acre-ft/Yr n g 5 percent acre-ft/yr select….. WIEA WE Water Exported: n g n/a 0.000 Acre-ft/Yr n g n/a percent acre-ft/yr select….. WEEA 3,719.400 Acre-ft/Yr
.
AUTHORIZED CONSUMPTION
BMAC Billed Metered: n g 5 3,599.480 Acre-ft/Yr
BUAC Billed Unmetered: n g n/a 0.000 Acre-ft/Yr
UMAC Unbilled Metered: n g 4 10.210 Acre-ft/Yr choose entry option:
UUAC Unbilled Unmetered: n g 8 12.660 Acre-ft/Yr 0.25% custom acre-ft/yr 3,622.350 Acre-ft/Yr
WATER LOSSES 97.050 Acre-ft/Yr
Apparent Losses
Default option selected for Systematic Data Handling Errors, with automatic data grading of 3 choose entry option:
SDHE Systematic Data Handling Errors: n g 3 8.999 Acre-ft/Yr 0.25% default acre-ft/yr CMI Customer Metering Inaccuracies: n g 3 0.000 Acre-ft/Yr percent acre-ft/yr under-registration UC Unauthorized Consumption: n g 6 3.150 Acre-ft/Yr 0.25% custom acre-ft/yr
12.149 Acre-ft/Yr
Real Losses
84.901 Acre-ft/Yr
97.050 Acre-ft/Yr
NON-REVENUE WATER
119.920 Acre-ft/Yr
SYSTEM DATA
Lm Length of mains: n g 3 132.0 miles (including fire hydrant lead lengths) Nc Number of service connections: n g 8 9,654 (active and inactive) Service connection density: 73 conn./mile main
Yes
Lp Average length of (private) customer service line: n g 10 (average distance between property line and meter) AOP Average Operating Pressure: n g 7 80.0 psi
COST DATA
CRUC Customer Retail Unit Charge: n g 9 $4.79
VPC Variable Production Cost: n g 3 $301.48 $/acre-ft $/yr (optional input) WATER AUDIT DATA VALIDITY TIER:
go to
dashboard
PRIORITY AREAS FOR ATTENTION TO IMPROVE DATA VALIDITY: KEY PERFORMANCE INDICATOR TARGETS:
Based on the information provided, audit reliability can be most improved by addressing the following components: OPTIONAL: If targets exist for the operational performance indicators, they can be input below:
1: Billed Metered (BMAC) Unit Total Losses: gal/conn/day 2: Volume from Own Sources (VOS) Unit Apparent Losses: gal/conn/day 3: Customer Metering Inaccuracies (CMI) Unit Real LossesA : gal/conn/day
Unit Real LossesB: gal/mile/day
If entered above by user, targets will display on KPI gauges (see Dashboard) go to start page
NON-REVENUE WATER:
If entering an
Error Adjustment,
select under- or overregistration
3.150
9.690
WATER SUPPLIED:
AUTHORIZED CONSUMPTION:
Apparent Losses:
Average length of customer service line has been set to zero and a data grading of 10 has been applied A weighted scale for the components of supply, consumption and water loss is included in the calculation of the Water Audit Data Validity Score *** The Water Audit Data Validity Score is in Tier III (51-70). See Dashboard tab for additional outputs. *** $/100 cubic feet (ccf)
$13,241,452
Total Annual Operating Cost
Are customer meters typically located at the curbstop/property line? AWWA Free Water Audit Software:
Worksheet
12.660
City of Hemet
Jul 01 2023 - Jun 30 2024
Water Supplied Error Adjustments
2024 Fiscal
Real Losses:
WATER LOSSES:
Click 'g' to determine data validity grade
Click 'n' to add notes
FWAS v6.0
American Water Works Association.
Copyright © 2020, All Rights Reserved.
To access definitions, click the input name
To edit water system info:
14.B.
Water Audit Report for:
Audit Year:
All volumes to be entered as: ACRE-FEET PER YEAR
WATER SUPPLIED choose entry option:
VOS Volume from Own Sources: n g 9 2,800.716 Acre-ft/Yr n g 8 percent acre-ft/yr VOSEA WI Water Imported: n g 7 1,246.308 Acre-ft/Yr n g 5 percent acre-ft/yr WIEA WE Water Exported: n g n/a 0.000 Acre-ft/Yr n g n/a percent acre-ft/yr WEEA 4,047.024 Acre-ft/Yr
.
AUTHORIZED CONSUMPTION
BMAC Billed Metered: n g 5 3,965.000 Acre-ft/Yr
BUAC Billed Unmetered: n g n/a 0.000 Acre-ft/Yr
UMAC Unbilled Metered: n g 4 5.240 Acre-ft/Yr choose entry option:
UUAC Unbilled Unmetered: n g 8 3.760 Acre-ft/Yr 0.25% custom acre-ft/yr 3,974.000 Acre-ft/Yr
WATER LOSSES 73.024 Acre-ft/Yr
Apparent Losses
Default option selected for Systematic Data Handling Errors, with automatic data grading of 3 choose entry option:
SDHE Systematic Data Handling Errors: n g 3 9.913 Acre-ft/Yr 0.25% default acre-ft/yr CMI Customer Metering Inaccuracies: n g 3 0.000 Acre-ft/Yr percent acre-ft/yr under-registration UC Unauthorized Consumption: n g 6 0.670 Acre-ft/Yr 0.25% custom acre-ft/yr
10.583 Acre-ft/Yr
Real Losses
62.441 Acre-ft/Yr
73.024 Acre-ft/Yr
NON-REVENUE WATER
82.024 Acre-ft/Yr
SYSTEM DATA
Lm Length of mains: n g 3 132.0 miles (including fire hydrant lead lengths) Nc Number of service connections: n g 8 9,654 (active and inactive) Service connection density: 73 conn./mile main
Yes
Lp Average length of (private) customer service line: n g 10 15.0 (average distance between property line and meter) AOP Average Operating Pressure: n g 7 80.0 psi
COST DATA
CRUC Customer Retail Unit Charge: n g 9 $4.79
VPC Variable Production Cost: n g 3 $301.48 $/acre-ft $/yr (optional input) carbon
WATER AUDIT DATA VALIDITY TIER:
go to
dashboard
PRIORITY AREAS FOR ATTENTION TO IMPROVE DATA VALIDITY: KEY PERFORMANCE INDICATOR TARGETS:
Based on the information provided, audit reliability can be most improved by addressing the following components: OPTIONAL: If targets exist for the operational performance indicators, they can be input below:
1: Billed Metered (BMAC) Unit Total Losses: gal/conn/day 2: Customer Metering Inaccuracies (CMI) Unit Apparent Losses: gal/conn/day 3: Length of Mains (Lm) Unit Real LossesA
: gal/conn/day
Unit Real LossesB: gal/mile/day
If entered above by user, targets will display on KPI gauges (see Dashboard) Are customer meters typically located at the curbstop/property line? AWWA Free Water Audit Software:
Worksheet
3.760
City of Hemet
Jul 01 2024 - Jun 30 2025
Water Supplied Error Adjustments
2025 Fiscal
Real Losses:
WATER LOSSES:
Average length of customer service line has been set to zero and a data grading of 10 has been applied A weighted scale for the components of supply, consumption and water loss is included in the calculation of the Water Audit Data Validity Score *** The Water Audit Data Validity Score is in Tier III (51-70). See Dashboard tab for additional outputs. *** $/100 cubic feet (ccf)
$12,901,400
Total Annual Operating Cost
Click here to calculate carbon emissions --->
go to start page
NON-REVENUE WATER:
If entering an
Error Adjustment,
select under- or overregistration
0.670
WATER SUPPLIED:
AUTHORIZED CONSUMPTION:
Apparent Losses:
Click 'g' to determine data validity grade
Click 'n' to add notes
FWAS v6.1
American Water Works Association.
Copyright © 2025, All Rights Reserved.
To access definitions, click the input name
To edit water system info:
14.B.
APPENDIX F
Climate Change Considerations
(CAL-ADAPT DATA)
2025 URBAN WATER MANAGEMENT PLAN
For the City of Hemet
July 2026
14.B.
SAN JACINTO BASIN
MODELED ANNUAL AVERAGE PRECIPITATION
CAL-ADAPT METHOD: RCP 4.5 (CANESM2)
CAL-ADAPT DATA
14.B.
0 2468
10121416182022
2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 Precipitation (inches)
Calendar Year
San Jacinto Basin
Modeled Annual Average Precipitation
Cal-Adapt Method: RCP 4.5 (CanESM2)
Projected Modeled Projected Modeled Average Historical Modeled Average
12.18"
12.03"
Data Source: Cal-Adapt Notes:
Projected Modeled Average includes modeled years 2025 through 2050 Historical Modeled Average includes modeled years 1950 through 2024 Cal-Adapt defines the general circulation model (GCM) CanESM2 as an "average simulation"
14.B.
Location User Defined Boundary - San Jacinto Basin
Climate Value Precipitation
Units Inches
Scenario rcp45
Name Date Value Year Historical Average Modeled Average CanESM2 Sun Jan 01 1950 00:00:00 GMT-0800 (Pacific Standard Time) 4.154926327 1950 12.03 12.18 CanESM2 Mon Jan 01 1951 00:00:00 GMT-0800 (Pacific Standard Time) 13.38118304 1951 12.03 12.18 CanESM2 Tue Jan 01 1952 00:00:00 GMT-0800 (Pacific Standard Time) 12.14857758 1952 12.03 12.18 CanESM2 Thu Jan 01 1953 00:00:00 GMT-0800 (Pacific Standard Time) 7.51695108 1953 12.03 12.18 CanESM2 Fri Jan 01 1954 00:00:00 GMT-0800 (Pacific Standard Time) 13.54438391 1954 12.03 12.18 CanESM2 Sat Jan 01 1955 00:00:00 GMT-0800 (Pacific Standard Time) 20.06439035 1955 12.03 12.18 CanESM2 Sun Jan 01 1956 00:00:00 GMT-0800 (Pacific Standard Time) 6.297976926 1956 12.03 12.18 CanESM2 Tue Jan 01 1957 00:00:00 GMT-0800 (Pacific Standard Time) 9.909206808 1957 12.03 12.18 CanESM2 Wed Jan 01 1958 00:00:00 GMT-0800 (Pacific Standard Time) 5.646503451 1958 12.03 12.18 CanESM2 Thu Jan 01 1959 00:00:00 GMT-0800 (Pacific Standard Time) 8.930063244 1959 12.03 12.18 CanESM2 Fri Jan 01 1960 00:00:00 GMT-0800 (Pacific Standard Time) 9.249598566 1960 12.03 12.18 CanESM2 Sun Jan 01 1961 00:00:00 GMT-0800 (Pacific Standard Time) 9.659691004 1961 12.03 12.18 CanESM2 Mon Jan 01 1962 00:00:00 GMT-0800 (Pacific Standard Time) 17.1494322 1962 12.03 12.18 CanESM2 Tue Jan 01 1963 00:00:00 GMT-0800 (Pacific Standard Time) 3.809336587 1963 12.03 12.18 CanESM2 Wed Jan 01 1964 00:00:00 GMT-0800 (Pacific Standard Time) 23.98658418 1964 12.03 12.18 CanESM2 Fri Jan 01 1965 00:00:00 GMT-0800 (Pacific Standard Time) 23.41486718 1965 12.03 12.18 CanESM2 Sat Jan 01 1966 00:00:00 GMT-0800 (Pacific Standard Time) 10.70271204 1966 12.03 12.18 CanESM2 Sun Jan 01 1967 00:00:00 GMT-0800 (Pacific Standard Time) 15.80390609 1967 12.03 12.18 CanESM2 Mon Jan 01 1968 00:00:00 GMT-0800 (Pacific Standard Time) 11.27226687 1968 12.03 12.18 CanESM2 Wed Jan 01 1969 00:00:00 GMT-0800 (Pacific Standard Time) 21.92971165 1969 12.03 12.18 CanESM2 Thu Jan 01 1970 00:00:00 GMT-0800 (Pacific Standard Time) 10.23338627 1970 12.03 12.18 CanESM2 Fri Jan 01 1971 00:00:00 GMT-0800 (Pacific Standard Time) 5.132980804 1971 12.03 12.18 CanESM2 Sat Jan 01 1972 00:00:00 GMT-0800 (Pacific Standard Time) 11.20814086 1972 12.03 12.18 CanESM2 Mon Jan 01 1973 00:00:00 GMT-0800 (Pacific Standard Time) 10.5117226 1973 12.03 12.18 CanESM2 Tue Jan 01 1974 00:00:00 GMT-0800 (Pacific Standard Time) 21.88825251 1974 12.03 12.18 CanESM2 Wed Jan 01 1975 00:00:00 GMT-0800 (Pacific Standard Time) 6.563913173 1975 12.03 12.18 CanESM2 Thu Jan 01 1976 00:00:00 GMT-0800 (Pacific Standard Time) 13.21453176 1976 12.03 12.18 CanESM2 Sat Jan 01 1977 00:00:00 GMT-0800 (Pacific Standard Time) 13.79800312 1977 12.03 12.18 CanESM2 Sun Jan 01 1978 00:00:00 GMT-0800 (Pacific Standard Time) 10.89862323 1978 12.03 12.18 CanESM2 Mon Jan 01 1979 00:00:00 GMT-0800 (Pacific Standard Time) 7.609370108 1979 12.03 12.18 CanESM2 Tue Jan 01 1980 00:00:00 GMT-0800 (Pacific Standard Time) 6.061317161 1980 12.03 12.18 CanESM2 Thu Jan 01 1981 00:00:00 GMT-0800 (Pacific Standard Time) 11.41411627 1981 12.03 12.18 CanESM2 Fri Jan 01 1982 00:00:00 GMT-0800 (Pacific Standard Time) 20.10787303 1982 12.03 12.18 CanESM2 Sat Jan 01 1983 00:00:00 GMT-0800 (Pacific Standard Time) 9.919199088 1983 12.03 12.18 CanESM2 Sun Jan 01 1984 00:00:00 GMT-0800 (Pacific Standard Time) 10.77524204 1984 12.03 12.18 CanESM2 Tue Jan 01 1985 00:00:00 GMT-0800 (Pacific Standard Time) 28.73650143 1985 12.03 12.18 CanESM2 Wed Jan 01 1986 00:00:00 GMT-0800 (Pacific Standard Time) 6.492031884 1986 12.03 12.18 CanESM2 Thu Jan 01 1987 00:00:00 GMT-0800 (Pacific Standard Time) 12.04364056 1987 12.03 12.18 CanESM2 Fri Jan 01 1988 00:00:00 GMT-0800 (Pacific Standard Time) 7.758761192 1988 12.03 12.18 CanESM2 Sun Jan 01 1989 00:00:00 GMT-0800 (Pacific Standard Time) 14.15063539 1989 12.03 12.18 CanESM2 Mon Jan 01 1990 00:00:00 GMT-0800 (Pacific Standard Time) 15.03612656 1990 12.03 12.18 CanESM2 Tue Jan 01 1991 00:00:00 GMT-0800 (Pacific Standard Time) 13.7520973 1991 12.03 12.18 CanESM2 Wed Jan 01 1992 00:00:00 GMT-0800 (Pacific Standard Time) 13.93091374 1992 12.03 12.18 CanESM2 Fri Jan 01 1993 00:00:00 GMT-0800 (Pacific Standard Time) 12.33865726 1993 12.03 12.18 CanESM2 Sat Jan 01 1994 00:00:00 GMT-0800 (Pacific Standard Time) 11.23525531 1994 12.03 12.18 CanESM2 Sun Jan 01 1995 00:00:00 GMT-0800 (Pacific Standard Time) 10.66456772 1995 12.03 12.18 CanESM2 Mon Jan 01 1996 00:00:00 GMT-0800 (Pacific Standard Time) 8.019528557 1996 12.03 12.18 CanESM2 Wed Jan 01 1997 00:00:00 GMT-0800 (Pacific Standard Time) 29.03782788 1997 12.03 12.18 CanESM2 Thu Jan 01 1998 00:00:00 GMT-0800 (Pacific Standard Time) 8.547563602 1998 12.03 12.18 CanESM2 Fri Jan 01 1999 00:00:00 GMT-0800 (Pacific Standard Time) 7.26749001 1999 12.03 12.18 CanESM2 Sat Jan 01 2000 00:00:00 GMT-0800 (Pacific Standard Time) 6.188533867 2000 12.03 12.18 CanESM2 Mon Jan 01 2001 00:00:00 GMT-0800 (Pacific Standard Time) 8.125442369 2001 12.03 12.18 CanESM2 Tue Jan 01 2002 00:00:00 GMT-0800 (Pacific Standard Time) 9.136061297 2002 12.03 12.18 CanESM2 Wed Jan 01 2003 00:00:00 GMT-0800 (Pacific Standard Time) 10.79333018 2003 12.03 12.18 CanESM2 Thu Jan 01 2004 00:00:00 GMT-0800 (Pacific Standard Time) 10.64735235 2004 12.03 12.18 CanESM2 Sat Jan 01 2005 00:00:00 GMT-0800 (Pacific Standard Time) 14.92609139 2005 12.03 12.18 CanESM2 Sun Jan 01 2006 00:00:00 GMT-0800 (Pacific Standard Time) 10.66862542 2006 12.03 12.18 CanESM2 Mon Jan 01 2007 00:00:00 GMT-0800 (Pacific Standard Time) 4.016103828 2007 12.03 12.18 CanESM2 Tue Jan 01 2008 00:00:00 GMT-0800 (Pacific Standard Time) 10.72111864 2008 12.03 12.18 CanESM2 Thu Jan 01 2009 00:00:00 GMT-0800 (Pacific Standard Time) 8.230063733 2009 12.03 12.18 CanESM2 Fri Jan 01 2010 00:00:00 GMT-0800 (Pacific Standard Time) 9.86184391 2010 12.03 12.18 CanESM2 Sat Jan 01 2011 00:00:00 GMT-0800 (Pacific Standard Time) 14.11529681 2011 12.03 12.18 CanESM2 Sun Jan 01 2012 00:00:00 GMT-0800 (Pacific Standard Time) 6.560638562 2012 12.03 12.18 CanESM2 Tue Jan 01 2013 00:00:00 GMT-0800 (Pacific Standard Time) 6.554425714 2013 12.03 12.18 CanESM2 Wed Jan 01 2014 00:00:00 GMT-0800 (Pacific Standard Time) 7.323869023 2014 12.03 12.18 CanESM2 Thu Jan 01 2015 00:00:00 GMT-0800 (Pacific Standard Time) 17.49330926 2015 12.03 12.18 CanESM2 Fri Jan 01 2016 00:00:00 GMT-0800 (Pacific Standard Time) 24.6240611 2016 12.03 12.18 CanESM2 Sun Jan 01 2017 00:00:00 GMT-0800 (Pacific Standard Time) 9.242453256 2017 12.03 12.18 CanESM2 Mon Jan 01 2018 00:00:00 GMT-0800 (Pacific Standard Time) 5.116526807 2018 12.03 12.18 CanESM2 Tue Jan 01 2019 00:00:00 GMT-0800 (Pacific Standard Time) 8.565097387 2019 12.03 12.18 CanESM2 Wed Jan 01 2020 00:00:00 GMT-0800 (Pacific Standard Time) 13.16421181 2020 12.03 12.18 Cal-Adapt
Annual Averages Tool - Precipitation
San Jacinto Basin
14.B.
CanESM2 Fri Jan 01 2021 00:00:00 GMT-0800 (Pacific Standard Time) 11.05031841 2021 12.03 12.18 CanESM2 Sat Jan 01 2022 00:00:00 GMT-0800 (Pacific Standard Time) 28.44483142 2022 12.03 12.18 CanESM2 Sun Jan 01 2023 00:00:00 GMT-0800 (Pacific Standard Time) 17.70992876 2023 12.03 12.18 CanESM2 Mon Jan 01 2024 00:00:00 GMT-0800 (Pacific Standard Time) 12.78915354 2024 12.03 12.18 CanESM2 Wed Jan 01 2025 00:00:00 GMT-0800 (Pacific Standard Time) 6.894264738 2025 12.03 12.18 CanESM2 Thu Jan 01 2026 00:00:00 GMT-0800 (Pacific Standard Time) 13.98339701 2026 12.03 12.18 CanESM2 Fri Jan 01 2027 00:00:00 GMT-0800 (Pacific Standard Time) 16.06460024 2027 12.03 12.18 CanESM2 Sat Jan 01 2028 00:00:00 GMT-0800 (Pacific Standard Time) 12.90309863 2028 12.03 12.18 CanESM2 Mon Jan 01 2029 00:00:00 GMT-0800 (Pacific Standard Time) 19.84671339 2029 12.03 12.18 CanESM2 Tue Jan 01 2030 00:00:00 GMT-0800 (Pacific Standard Time) 11.69561651 2030 12.03 12.18 CanESM2 Wed Jan 01 2031 00:00:00 GMT-0800 (Pacific Standard Time) 7.244532847 2031 12.03 12.18 CanESM2 Thu Jan 01 2032 00:00:00 GMT-0800 (Pacific Standard Time) 16.23797106 2032 12.03 12.18 CanESM2 Sat Jan 01 2033 00:00:00 GMT-0800 (Pacific Standard Time) 9.132163011 2033 12.03 12.18 CanESM2 Sun Jan 01 2034 00:00:00 GMT-0800 (Pacific Standard Time) 6.152815119 2034 12.03 12.18 CanESM2 Mon Jan 01 2035 00:00:00 GMT-0800 (Pacific Standard Time) 15.9997365 2035 12.03 12.18 CanESM2 Tue Jan 01 2036 00:00:00 GMT-0800 (Pacific Standard Time) 10.9201903 2036 12.03 12.18 CanESM2 Thu Jan 01 2037 00:00:00 GMT-0800 (Pacific Standard Time) 20.04903953 2037 12.03 12.18 CanESM2 Fri Jan 01 2038 00:00:00 GMT-0800 (Pacific Standard Time) 4.907740014 2038 12.03 12.18 CanESM2 Sat Jan 01 2039 00:00:00 GMT-0800 (Pacific Standard Time) 9.734808465 2039 12.03 12.18 CanESM2 Sun Jan 01 2040 00:00:00 GMT-0800 (Pacific Standard Time) 17.49867338 2040 12.03 12.18 CanESM2 Tue Jan 01 2041 00:00:00 GMT-0800 (Pacific Standard Time) 6.708715682 2041 12.03 12.18 CanESM2 Wed Jan 01 2042 00:00:00 GMT-0800 (Pacific Standard Time) 10.72668097 2042 12.03 12.18 CanESM2 Thu Jan 01 2043 00:00:00 GMT-0800 (Pacific Standard Time) 8.781249794 2043 12.03 12.18 CanESM2 Fri Jan 01 2044 00:00:00 GMT-0800 (Pacific Standard Time) 9.458748503 2044 12.03 12.18 CanESM2 Sun Jan 01 2045 00:00:00 GMT-0800 (Pacific Standard Time) 16.99060999 2045 12.03 12.18 CanESM2 Mon Jan 01 2046 00:00:00 GMT-0800 (Pacific Standard Time) 16.02303269 2046 12.03 12.18 CanESM2 Tue Jan 01 2047 00:00:00 GMT-0800 (Pacific Standard Time) 15.30858784 2047 12.03 12.18 CanESM2 Wed Jan 01 2048 00:00:00 GMT-0800 (Pacific Standard Time) 16.21495206 2048 12.03 12.18 CanESM2 Fri Jan 01 2049 00:00:00 GMT-0800 (Pacific Standard Time) 8.317568454 2049 12.03 12.18 CanESM2 Sat Jan 01 2050 00:00:00 GMT-0800 (Pacific Standard Time) 9.01895224 2050 12.03 12.18 CanESM2 Sun Jan 01 2051 00:00:00 GMT-0800 (Pacific Standard Time) 6.38015703 2051 12.03 12.18 CanESM2 Mon Jan 01 2052 00:00:00 GMT-0800 (Pacific Standard Time) 18.62068627 2052 12.03 12.18 CanESM2 Wed Jan 01 2053 00:00:00 GMT-0800 (Pacific Standard Time) 8.635235712 2053 12.03 12.18 CanESM2 Thu Jan 01 2054 00:00:00 GMT-0800 (Pacific Standard Time) 9.333907808 2054 12.03 12.18 CanESM2 Fri Jan 01 2055 00:00:00 GMT-0800 (Pacific Standard Time) 7.94530075 2055 12.03 12.18 CanESM2 Sat Jan 01 2056 00:00:00 GMT-0800 (Pacific Standard Time) 13.61751547 2056 12.03 12.18 CanESM2 Mon Jan 01 2057 00:00:00 GMT-0800 (Pacific Standard Time) 13.98105251 2057 12.03 12.18 CanESM2 Tue Jan 01 2058 00:00:00 GMT-0800 (Pacific Standard Time) 6.913509071 2058 12.03 12.18 CanESM2 Wed Jan 01 2059 00:00:00 GMT-0800 (Pacific Standard Time) 20.07330497 2059 12.03 12.18 CanESM2 Thu Jan 01 2060 00:00:00 GMT-0800 (Pacific Standard Time) 21.80079433 2060 12.03 12.18 CanESM2 Sat Jan 01 2061 00:00:00 GMT-0800 (Pacific Standard Time) 7.473742067 2061 12.03 12.18 CanESM2 Sun Jan 01 2062 00:00:00 GMT-0800 (Pacific Standard Time) 9.428407232 2062 12.03 12.18 CanESM2 Mon Jan 01 2063 00:00:00 GMT-0800 (Pacific Standard Time) 5.041929578 2063 12.03 12.18 CanESM2 Tue Jan 01 2064 00:00:00 GMT-0800 (Pacific Standard Time) 10.07261604 2064 12.03 12.18 CanESM2 Thu Jan 01 2065 00:00:00 GMT-0800 (Pacific Standard Time) 11.25781924 2065 12.03 12.18 CanESM2 Fri Jan 01 2066 00:00:00 GMT-0800 (Pacific Standard Time) 11.97523031 2066 12.03 12.18 CanESM2 Sat Jan 01 2067 00:00:00 GMT-0800 (Pacific Standard Time) 16.82574375 2067 12.03 12.18 CanESM2 Sun Jan 01 2068 00:00:00 GMT-0800 (Pacific Standard Time) 12.29487714 2068 12.03 12.18 CanESM2 Tue Jan 01 2069 00:00:00 GMT-0800 (Pacific Standard Time) 17.86718549 2069 12.03 12.18 CanESM2 Wed Jan 01 2070 00:00:00 GMT-0800 (Pacific Standard Time) 17.50639849 2070 12.03 12.18 CanESM2 Thu Jan 01 2071 00:00:00 GMT-0800 (Pacific Standard Time) 18.42522915 2071 12.03 12.18 CanESM2 Fri Jan 01 2072 00:00:00 GMT-0800 (Pacific Standard Time) 5.8822198 2072 12.03 12.18 CanESM2 Sun Jan 01 2073 00:00:00 GMT-0800 (Pacific Standard Time) 17.87069055 2073 12.03 12.18 CanESM2 Mon Jan 01 2074 00:00:00 GMT-0800 (Pacific Standard Time) 14.04738608 2074 12.03 12.18 CanESM2 Tue Jan 01 2075 00:00:00 GMT-0800 (Pacific Standard Time) 16.76694212 2075 12.03 12.18 CanESM2 Wed Jan 01 2076 00:00:00 GMT-0800 (Pacific Standard Time) 9.699097701 2076 12.03 12.18 CanESM2 Fri Jan 01 2077 00:00:00 GMT-0800 (Pacific Standard Time) 17.65872391 2077 12.03 12.18 CanESM2 Sat Jan 01 2078 00:00:00 GMT-0800 (Pacific Standard Time) 16.97943059 2078 12.03 12.18 CanESM2 Sun Jan 01 2079 00:00:00 GMT-0800 (Pacific Standard Time) 17.06735457 2079 12.03 12.18 CanESM2 Mon Jan 01 2080 00:00:00 GMT-0800 (Pacific Standard Time) 35.4564137 2080 12.03 12.18 CanESM2 Wed Jan 01 2081 00:00:00 GMT-0800 (Pacific Standard Time) 13.52076676 2081 12.03 12.18 CanESM2 Thu Jan 01 2082 00:00:00 GMT-0800 (Pacific Standard Time) 12.81223842 2082 12.03 12.18 CanESM2 Fri Jan 01 2083 00:00:00 GMT-0800 (Pacific Standard Time) 13.83000243 2083 12.03 12.18 CanESM2 Sat Jan 01 2084 00:00:00 GMT-0800 (Pacific Standard Time) 15.93415018 2084 12.03 12.18 CanESM2 Mon Jan 01 2085 00:00:00 GMT-0800 (Pacific Standard Time) 7.757825932 2085 12.03 12.18 CanESM2 Tue Jan 01 2086 00:00:00 GMT-0800 (Pacific Standard Time) 16.47485125 2086 12.03 12.18 CanESM2 Wed Jan 01 2087 00:00:00 GMT-0800 (Pacific Standard Time) 8.342668187 2087 12.03 12.18 CanESM2 Thu Jan 01 2088 00:00:00 GMT-0800 (Pacific Standard Time) 24.27338592 2088 12.03 12.18 CanESM2 Sat Jan 01 2089 00:00:00 GMT-0800 (Pacific Standard Time) 13.34109595 2089 12.03 12.18 CanESM2 Sun Jan 01 2090 00:00:00 GMT-0800 (Pacific Standard Time) 9.617900274 2090 12.03 12.18 CanESM2 Mon Jan 01 2091 00:00:00 GMT-0800 (Pacific Standard Time) 5.275142831 2091 12.03 12.18 CanESM2 Tue Jan 01 2092 00:00:00 GMT-0800 (Pacific Standard Time) 4.7516025 2092 12.03 12.18 CanESM2 Thu Jan 01 2093 00:00:00 GMT-0800 (Pacific Standard Time) 20.89002775 2093 12.03 12.18 CanESM2 Fri Jan 01 2094 00:00:00 GMT-0800 (Pacific Standard Time) 13.97416781 2094 12.03 12.18 CanESM2 Sat Jan 01 2095 00:00:00 GMT-0800 (Pacific Standard Time) 5.375353648 2095 12.03 12.18 CanESM2 Sun Jan 01 2096 00:00:00 GMT-0800 (Pacific Standard Time) 9.070858213 2096 12.03 12.18 CanESM2 Tue Jan 01 2097 00:00:00 GMT-0800 (Pacific Standard Time) 12.55232967 2097 12.03 12.18 CanESM2 Wed Jan 01 2098 00:00:00 GMT-0800 (Pacific Standard Time) 18.94354176 2098 12.03 12.18 CanESM2 Thu Jan 01 2099 00:00:00 GMT-0800 (Pacific Standard Time) 8.409197834 2099 12.03 12.18 CanESM2 Fri Jan 01 2100 00:00:00 GMT-0800 (Pacific Standard Time) 13.54195652 2100 12.03 12.18
14.B.
SAN JACINTO BASIN
MODELED ANNUAL AVERAGE TEMPERATURE
CAL-ADAPT METHOD: RCP 4.5 (CANESM2)
CAL-ADAPT DATA
14.B.
76 77787980818283848586
2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 Average Maximum Temperature (degrees F)
Calendar Year
San Jacinto Basin
Modeled Annual Average Maximum Temperature
Cal-Adapt Method: RCP 4.5 (CanESM2)
Projected Modeled Projected Modeled Average Historical Modeled Average Data Source: Cal-Adapt
83.3F 79.5F
Notes: Projected Modeled Average includes modeled years 2025 through 2050 Historical Modeled Average includes modeled years 1950 through 2024 Cal-Adapt defines the general circulation model (GCM) CanESM2 as an "average simulation"
14.B.
Location User Defined Boundary
Climate Variable Maximum Temperature
Units °F
Scenario rcp45
Name Date Value Year Historical Average Modeled Average CanESM2 Sun Jan 01 1950 00:00:00 GMT-0800 (Pacific Standard Time) 80.88888 1950 79.54 83.31 CanESM2 Mon Jan 01 1951 00:00:00 GMT-0800 (Pacific Standard Time) 78.44749 1951 79.54 83.31 CanESM2 Tue Jan 01 1952 00:00:00 GMT-0800 (Pacific Standard Time) 78.19509 1952 79.54 83.31 CanESM2 Thu Jan 01 1953 00:00:00 GMT-0800 (Pacific Standard Time) 79.03749 1953 79.54 83.31 CanESM2 Fri Jan 01 1954 00:00:00 GMT-0800 (Pacific Standard Time) 77.75088 1954 79.54 83.31 CanESM2 Sat Jan 01 1955 00:00:00 GMT-0800 (Pacific Standard Time) 76.71123 1955 79.54 83.31 CanESM2 Sun Jan 01 1956 00:00:00 GMT-0800 (Pacific Standard Time) 78.99778 1956 79.54 83.31 CanESM2 Tue Jan 01 1957 00:00:00 GMT-0800 (Pacific Standard Time) 78.99841 1957 79.54 83.31 CanESM2 Wed Jan 01 1958 00:00:00 GMT-0800 (Pacific Standard Time) 79.27107 1958 79.54 83.31 CanESM2 Thu Jan 01 1959 00:00:00 GMT-0800 (Pacific Standard Time) 80.03226 1959 79.54 83.31 CanESM2 Fri Jan 01 1960 00:00:00 GMT-0800 (Pacific Standard Time) 79.67542 1960 79.54 83.31 CanESM2 Sun Jan 01 1961 00:00:00 GMT-0800 (Pacific Standard Time) 77.33712 1961 79.54 83.31 CanESM2 Mon Jan 01 1962 00:00:00 GMT-0800 (Pacific Standard Time) 78.74192 1962 79.54 83.31 CanESM2 Tue Jan 01 1963 00:00:00 GMT-0800 (Pacific Standard Time) 81.62256 1963 79.54 83.31 CanESM2 Wed Jan 01 1964 00:00:00 GMT-0800 (Pacific Standard Time) 76.56564 1964 79.54 83.31 CanESM2 Fri Jan 01 1965 00:00:00 GMT-0800 (Pacific Standard Time) 75.33269 1965 79.54 83.31 CanESM2 Sat Jan 01 1966 00:00:00 GMT-0800 (Pacific Standard Time) 77.17281 1966 79.54 83.31 CanESM2 Sun Jan 01 1967 00:00:00 GMT-0800 (Pacific Standard Time) 78.539 1967 79.54 83.31 CanESM2 Mon Jan 01 1968 00:00:00 GMT-0800 (Pacific Standard Time) 77.80837 1968 79.54 83.31 CanESM2 Wed Jan 01 1969 00:00:00 GMT-0800 (Pacific Standard Time) 77.43126 1969 79.54 83.31 CanESM2 Thu Jan 01 1970 00:00:00 GMT-0800 (Pacific Standard Time) 77.07339 1970 79.54 83.31 CanESM2 Fri Jan 01 1971 00:00:00 GMT-0800 (Pacific Standard Time) 79.06417 1971 79.54 83.31 CanESM2 Sat Jan 01 1972 00:00:00 GMT-0800 (Pacific Standard Time) 79.38414 1972 79.54 83.31 CanESM2 Mon Jan 01 1973 00:00:00 GMT-0800 (Pacific Standard Time) 77.71231 1973 79.54 83.31 CanESM2 Tue Jan 01 1974 00:00:00 GMT-0800 (Pacific Standard Time) 78.19684 1974 79.54 83.31 CanESM2 Wed Jan 01 1975 00:00:00 GMT-0800 (Pacific Standard Time) 80.33098 1975 79.54 83.31 CanESM2 Thu Jan 01 1976 00:00:00 GMT-0800 (Pacific Standard Time) 78.84041 1976 79.54 83.31 CanESM2 Sat Jan 01 1977 00:00:00 GMT-0800 (Pacific Standard Time) 77.41875 1977 79.54 83.31 CanESM2 Sun Jan 01 1978 00:00:00 GMT-0800 (Pacific Standard Time) 79.80498 1978 79.54 83.31 CanESM2 Mon Jan 01 1979 00:00:00 GMT-0800 (Pacific Standard Time) 79.94049 1979 79.54 83.31 CanESM2 Tue Jan 01 1980 00:00:00 GMT-0800 (Pacific Standard Time) 81.19691 1980 79.54 83.31 CanESM2 Thu Jan 01 1981 00:00:00 GMT-0800 (Pacific Standard Time) 80.74231 1981 79.54 83.31 CanESM2 Fri Jan 01 1982 00:00:00 GMT-0800 (Pacific Standard Time) 77.02495 1982 79.54 83.31 CanESM2 Sat Jan 01 1983 00:00:00 GMT-0800 (Pacific Standard Time) 78.64085 1983 79.54 83.31 CanESM2 Sun Jan 01 1984 00:00:00 GMT-0800 (Pacific Standard Time) 78.06625 1984 79.54 83.31 CanESM2 Tue Jan 01 1985 00:00:00 GMT-0800 (Pacific Standard Time) 77.04666 1985 79.54 83.31 CanESM2 Wed Jan 01 1986 00:00:00 GMT-0800 (Pacific Standard Time) 79.29062 1986 79.54 83.31 CanESM2 Thu Jan 01 1987 00:00:00 GMT-0800 (Pacific Standard Time) 77.73443 1987 79.54 83.31 CanESM2 Fri Jan 01 1988 00:00:00 GMT-0800 (Pacific Standard Time) 78.65568 1988 79.54 83.31 CanESM2 Sun Jan 01 1989 00:00:00 GMT-0800 (Pacific Standard Time) 77.62845 1989 79.54 83.31 CanESM2 Mon Jan 01 1990 00:00:00 GMT-0800 (Pacific Standard Time) 78.73246 1990 79.54 83.31 CanESM2 Tue Jan 01 1991 00:00:00 GMT-0800 (Pacific Standard Time) 79.4118 1991 79.54 83.31 CanESM2 Wed Jan 01 1992 00:00:00 GMT-0800 (Pacific Standard Time) 75.77044 1992 79.54 83.31 CanESM2 Fri Jan 01 1993 00:00:00 GMT-0800 (Pacific Standard Time) 79.85663 1993 79.54 83.31 CanESM2 Sat Jan 01 1994 00:00:00 GMT-0800 (Pacific Standard Time) 76.99605 1994 79.54 83.31 CanESM2 Sun Jan 01 1995 00:00:00 GMT-0800 (Pacific Standard Time) 80.06814 1995 79.54 83.31 CanESM2 Mon Jan 01 1996 00:00:00 GMT-0800 (Pacific Standard Time) 81.20622 1996 79.54 83.31 CanESM2 Wed Jan 01 1997 00:00:00 GMT-0800 (Pacific Standard Time) 77.91818 1997 79.54 83.31 CanESM2 Thu Jan 01 1998 00:00:00 GMT-0800 (Pacific Standard Time) 79.91459 1998 79.54 83.31 CanESM2 Fri Jan 01 1999 00:00:00 GMT-0800 (Pacific Standard Time) 80.81572 1999 79.54 83.31 CanESM2 Sat Jan 01 2000 00:00:00 GMT-0800 (Pacific Standard Time) 80.90155 2000 79.54 83.31 CanESM2 Mon Jan 01 2001 00:00:00 GMT-0800 (Pacific Standard Time) 80.83946 2001 79.54 83.31 CanESM2 Tue Jan 01 2002 00:00:00 GMT-0800 (Pacific Standard Time) 80.8485 2002 79.54 83.31 CanESM2 Wed Jan 01 2003 00:00:00 GMT-0800 (Pacific Standard Time) 78.68102 2003 79.54 83.31 CanESM2 Thu Jan 01 2004 00:00:00 GMT-0800 (Pacific Standard Time) 80.37048 2004 79.54 83.31 CanESM2 Sat Jan 01 2005 00:00:00 GMT-0800 (Pacific Standard Time) 79.52513 2005 79.54 83.31 CanESM2 Sun Jan 01 2006 00:00:00 GMT-0800 (Pacific Standard Time) 80.01825 2006 79.54 83.31 CanESM2 Mon Jan 01 2007 00:00:00 GMT-0800 (Pacific Standard Time) 81.42372 2007 79.54 83.31 CanESM2 Tue Jan 01 2008 00:00:00 GMT-0800 (Pacific Standard Time) 81.28253 2008 79.54 83.31 CanESM2 Thu Jan 01 2009 00:00:00 GMT-0800 (Pacific Standard Time) 82.07504 2009 79.54 83.31 CanESM2 Fri Jan 01 2010 00:00:00 GMT-0800 (Pacific Standard Time) 80.92094 2010 79.54 83.31 CanESM2 Sat Jan 01 2011 00:00:00 GMT-0800 (Pacific Standard Time) 81.45898 2011 79.54 83.31 CanESM2 Sun Jan 01 2012 00:00:00 GMT-0800 (Pacific Standard Time) 82.47701 2012 79.54 83.31 CanESM2 Tue Jan 01 2013 00:00:00 GMT-0800 (Pacific Standard Time) 83.62435 2013 79.54 83.31 CanESM2 Wed Jan 01 2014 00:00:00 GMT-0800 (Pacific Standard Time) 80.61999 2014 79.54 83.31 CanESM2 Thu Jan 01 2015 00:00:00 GMT-0800 (Pacific Standard Time) 80.63452 2015 79.54 83.31 CanESM2 Fri Jan 01 2016 00:00:00 GMT-0800 (Pacific Standard Time) 79.37437 2016 79.54 83.31 CanESM2 Sun Jan 01 2017 00:00:00 GMT-0800 (Pacific Standard Time) 81.58704 2017 79.54 83.31 CanESM2 Mon Jan 01 2018 00:00:00 GMT-0800 (Pacific Standard Time) 83.98739 2018 79.54 83.31 CanESM2 Tue Jan 01 2019 00:00:00 GMT-0800 (Pacific Standard Time) 81.93912 2019 79.54 83.31 CanESM2 Wed Jan 01 2020 00:00:00 GMT-0800 (Pacific Standard Time) 82.69519 2020 79.54 83.31 Cal-Adapt
Annual Averages Tool - Maximum Temperature
San Jacinto Basin
14.B.
CanESM2 Fri Jan 01 2021 00:00:00 GMT-0800 (Pacific Standard Time) 83.77071 2021 79.54 83.31 CanESM2 Sat Jan 01 2022 00:00:00 GMT-0800 (Pacific Standard Time) 79.82323 2022 79.54 83.31 CanESM2 Sun Jan 01 2023 00:00:00 GMT-0800 (Pacific Standard Time) 81.81778 2023 79.54 83.31 CanESM2 Mon Jan 01 2024 00:00:00 GMT-0800 (Pacific Standard Time) 82.46217 2024 79.54 83.31 CanESM2 Wed Jan 01 2025 00:00:00 GMT-0800 (Pacific Standard Time) 83.965 2025 79.54 83.31 CanESM2 Thu Jan 01 2026 00:00:00 GMT-0800 (Pacific Standard Time) 82.86368 2026 79.54 83.31 CanESM2 Fri Jan 01 2027 00:00:00 GMT-0800 (Pacific Standard Time) 81.99816 2027 79.54 83.31 CanESM2 Sat Jan 01 2028 00:00:00 GMT-0800 (Pacific Standard Time) 82.28257 2028 79.54 83.31 CanESM2 Mon Jan 01 2029 00:00:00 GMT-0800 (Pacific Standard Time) 80.82064 2029 79.54 83.31 CanESM2 Tue Jan 01 2030 00:00:00 GMT-0800 (Pacific Standard Time) 83.66483 2030 79.54 83.31 CanESM2 Wed Jan 01 2031 00:00:00 GMT-0800 (Pacific Standard Time) 84.20432 2031 79.54 83.31 CanESM2 Thu Jan 01 2032 00:00:00 GMT-0800 (Pacific Standard Time) 83.04996 2032 79.54 83.31 CanESM2 Sat Jan 01 2033 00:00:00 GMT-0800 (Pacific Standard Time) 83.3752 2033 79.54 83.31 CanESM2 Sun Jan 01 2034 00:00:00 GMT-0800 (Pacific Standard Time) 83.80251 2034 79.54 83.31 CanESM2 Mon Jan 01 2035 00:00:00 GMT-0800 (Pacific Standard Time) 82.35893 2035 79.54 83.31 CanESM2 Tue Jan 01 2036 00:00:00 GMT-0800 (Pacific Standard Time) 83.68856 2036 79.54 83.31 CanESM2 Thu Jan 01 2037 00:00:00 GMT-0800 (Pacific Standard Time) 82.46295 2037 79.54 83.31 CanESM2 Fri Jan 01 2038 00:00:00 GMT-0800 (Pacific Standard Time) 85.0323 2038 79.54 83.31 CanESM2 Sat Jan 01 2039 00:00:00 GMT-0800 (Pacific Standard Time) 84.45776 2039 79.54 83.31 CanESM2 Sun Jan 01 2040 00:00:00 GMT-0800 (Pacific Standard Time) 82.17286 2040 79.54 83.31 CanESM2 Tue Jan 01 2041 00:00:00 GMT-0800 (Pacific Standard Time) 83.7673 2041 79.54 83.31 CanESM2 Wed Jan 01 2042 00:00:00 GMT-0800 (Pacific Standard Time) 82.19824 2042 79.54 83.31 CanESM2 Thu Jan 01 2043 00:00:00 GMT-0800 (Pacific Standard Time) 84.27577 2043 79.54 83.31 CanESM2 Fri Jan 01 2044 00:00:00 GMT-0800 (Pacific Standard Time) 83.37887 2044 79.54 83.31 CanESM2 Sun Jan 01 2045 00:00:00 GMT-0800 (Pacific Standard Time) 84.85983 2045 79.54 83.31 CanESM2 Mon Jan 01 2046 00:00:00 GMT-0800 (Pacific Standard Time) 83.29238 2046 79.54 83.31 CanESM2 Tue Jan 01 2047 00:00:00 GMT-0800 (Pacific Standard Time) 82.81973 2047 79.54 83.31 CanESM2 Wed Jan 01 2048 00:00:00 GMT-0800 (Pacific Standard Time) 83.4558 2048 79.54 83.31 CanESM2 Fri Jan 01 2049 00:00:00 GMT-0800 (Pacific Standard Time) 83.83291 2049 79.54 83.31 CanESM2 Sat Jan 01 2050 00:00:00 GMT-0800 (Pacific Standard Time) 84.01898 2050 79.54 83.31 CanESM2 Sun Jan 01 2051 00:00:00 GMT-0800 (Pacific Standard Time) 84.16234 2051 79.54 83.31 CanESM2 Mon Jan 01 2052 00:00:00 GMT-0800 (Pacific Standard Time) 83.03517 2052 79.54 83.31 CanESM2 Wed Jan 01 2053 00:00:00 GMT-0800 (Pacific Standard Time) 84.79407 2053 79.54 83.31 CanESM2 Thu Jan 01 2054 00:00:00 GMT-0800 (Pacific Standard Time) 85.70736 2054 79.54 83.31 CanESM2 Fri Jan 01 2055 00:00:00 GMT-0800 (Pacific Standard Time) 86.35263 2055 79.54 83.31 CanESM2 Sat Jan 01 2056 00:00:00 GMT-0800 (Pacific Standard Time) 84.05232 2056 79.54 83.31 CanESM2 Mon Jan 01 2057 00:00:00 GMT-0800 (Pacific Standard Time) 83.58759 2057 79.54 83.31 CanESM2 Tue Jan 01 2058 00:00:00 GMT-0800 (Pacific Standard Time) 86.43049 2058 79.54 83.31 CanESM2 Wed Jan 01 2059 00:00:00 GMT-0800 (Pacific Standard Time) 83.92788 2059 79.54 83.31 CanESM2 Thu Jan 01 2060 00:00:00 GMT-0800 (Pacific Standard Time) 82.91383 2060 79.54 83.31 CanESM2 Sat Jan 01 2061 00:00:00 GMT-0800 (Pacific Standard Time) 85.90656 2061 79.54 83.31 CanESM2 Sun Jan 01 2062 00:00:00 GMT-0800 (Pacific Standard Time) 86.21211 2062 79.54 83.31 CanESM2 Mon Jan 01 2063 00:00:00 GMT-0800 (Pacific Standard Time) 86.35459 2063 79.54 83.31 CanESM2 Tue Jan 01 2064 00:00:00 GMT-0800 (Pacific Standard Time) 86.41482 2064 79.54 83.31 CanESM2 Thu Jan 01 2065 00:00:00 GMT-0800 (Pacific Standard Time) 84.75964 2065 79.54 83.31 CanESM2 Fri Jan 01 2066 00:00:00 GMT-0800 (Pacific Standard Time) 83.86584 2066 79.54 83.31 CanESM2 Sat Jan 01 2067 00:00:00 GMT-0800 (Pacific Standard Time) 82.22513 2067 79.54 83.31 CanESM2 Sun Jan 01 2068 00:00:00 GMT-0800 (Pacific Standard Time) 83.77169 2068 79.54 83.31 CanESM2 Tue Jan 01 2069 00:00:00 GMT-0800 (Pacific Standard Time) 85.03458 2069 79.54 83.31 CanESM2 Wed Jan 01 2070 00:00:00 GMT-0800 (Pacific Standard Time) 83.4602 2070 79.54 83.31 CanESM2 Thu Jan 01 2071 00:00:00 GMT-0800 (Pacific Standard Time) 84.17925 2071 79.54 83.31 CanESM2 Fri Jan 01 2072 00:00:00 GMT-0800 (Pacific Standard Time) 86.51352 2072 79.54 83.31 CanESM2 Sun Jan 01 2073 00:00:00 GMT-0800 (Pacific Standard Time) 83.63071 2073 79.54 83.31 CanESM2 Mon Jan 01 2074 00:00:00 GMT-0800 (Pacific Standard Time) 86.55085 2074 79.54 83.31 CanESM2 Tue Jan 01 2075 00:00:00 GMT-0800 (Pacific Standard Time) 84.70783 2075 79.54 83.31 CanESM2 Wed Jan 01 2076 00:00:00 GMT-0800 (Pacific Standard Time) 85.72126 2076 79.54 83.31 CanESM2 Fri Jan 01 2077 00:00:00 GMT-0800 (Pacific Standard Time) 85.26552 2077 79.54 83.31 CanESM2 Sat Jan 01 2078 00:00:00 GMT-0800 (Pacific Standard Time) 84.26554 2078 79.54 83.31 CanESM2 Sun Jan 01 2079 00:00:00 GMT-0800 (Pacific Standard Time) 85.62231 2079 79.54 83.31 CanESM2 Mon Jan 01 2080 00:00:00 GMT-0800 (Pacific Standard Time) 83.58521 2080 79.54 83.31 CanESM2 Wed Jan 01 2081 00:00:00 GMT-0800 (Pacific Standard Time) 84.24837 2081 79.54 83.31 CanESM2 Thu Jan 01 2082 00:00:00 GMT-0800 (Pacific Standard Time) 86.25703 2082 79.54 83.31 CanESM2 Fri Jan 01 2083 00:00:00 GMT-0800 (Pacific Standard Time) 84.31744 2083 79.54 83.31 CanESM2 Sat Jan 01 2084 00:00:00 GMT-0800 (Pacific Standard Time) 84.11669 2084 79.54 83.31 CanESM2 Mon Jan 01 2085 00:00:00 GMT-0800 (Pacific Standard Time) 85.09181 2085 79.54 83.31 CanESM2 Tue Jan 01 2086 00:00:00 GMT-0800 (Pacific Standard Time) 83.94561 2086 79.54 83.31 CanESM2 Wed Jan 01 2087 00:00:00 GMT-0800 (Pacific Standard Time) 86.30992 2087 79.54 83.31 CanESM2 Thu Jan 01 2088 00:00:00 GMT-0800 (Pacific Standard Time) 84.53717 2088 79.54 83.31 CanESM2 Sat Jan 01 2089 00:00:00 GMT-0800 (Pacific Standard Time) 84.68059 2089 79.54 83.31 CanESM2 Sun Jan 01 2090 00:00:00 GMT-0800 (Pacific Standard Time) 84.8984 2090 79.54 83.31 CanESM2 Mon Jan 01 2091 00:00:00 GMT-0800 (Pacific Standard Time) 84.36687 2091 79.54 83.31 CanESM2 Tue Jan 01 2092 00:00:00 GMT-0800 (Pacific Standard Time) 86.24411 2092 79.54 83.31 CanESM2 Thu Jan 01 2093 00:00:00 GMT-0800 (Pacific Standard Time) 84.3542 2093 79.54 83.31 CanESM2 Fri Jan 01 2094 00:00:00 GMT-0800 (Pacific Standard Time) 83.23267 2094 79.54 83.31 CanESM2 Sat Jan 01 2095 00:00:00 GMT-0800 (Pacific Standard Time) 85.83319 2095 79.54 83.31 CanESM2 Sun Jan 01 2096 00:00:00 GMT-0800 (Pacific Standard Time) 84.96809 2096 79.54 83.31 CanESM2 Tue Jan 01 2097 00:00:00 GMT-0800 (Pacific Standard Time) 85.37642 2097 79.54 83.31 CanESM2 Wed Jan 01 2098 00:00:00 GMT-0800 (Pacific Standard Time) 83.86294 2098 79.54 83.31 CanESM2 Thu Jan 01 2099 00:00:00 GMT-0800 (Pacific Standard Time) 85.79675 2099 79.54 83.31 CanESM2 Fri Jan 01 2100 00:00:00 GMT-0800 (Pacific Standard Time) 86.2287 2100 79.54 83.31
14.B.
APPENDIX G
SB X7-7 Verification Form
2025 URBAN WATER MANAGEMENT PLAN
For the City of Hemet
July 2026
14.B.
SB X7Ͳ7 Table 0: Units of Measure Used in UWMP* (select one from the drop down list)
Acre Feet
*The unit of measure must be consistent with Table 2Ͳ3
NOTES:
14.B.
Parameter Value Units
2008 total water deliveries 4,784 Acre Feet
2008 total volume of delivered recycled water Ͳ Acre Feet2008 recycled water as a percent of total deliveries 0.00% PercentNumber of years in baseline period1, 2 10 Years Year beginning baseline period range 1995Year ending baseline period range3 2004 Number of years in baseline period 5 YearsYear beginning baseline period range 2003 Year ending baseline period range4 2007
SB X7Ͳ7 TableͲ1: Baseline Period Ranges
1 If the 2008 recycled water percent is less than 10 percent, then the first baseline period is a continuous 10Ͳyear period. If the amount of recycled water delivered in 2008 is 10 percent or greater, the first baseline period is a continuous 10Ͳto 15Ͳyear period. 2 The Water Code requires that the baseline period is between 10 and 15 years. However, DWR recognizes that some water suppliers may not have the minimum 10 years of baseline data.
3 The ending year must be between December 31, 2004 and December 31, 2010.4 The ending year must be between December 31, 2007 and December 31, 2010. 5Ͳyear
baseline period
Baseline
10Ͳto 15Ͳyear
baseline period
NOTES:
14.B.
NOTES:
SB X7Ͳ7 Table 2: Method for Population Estimates
Method Used to Determine Population
(may check more than one)
1. Department of Finance(DOF)
DOF Table EͲ8 (1990Ͳ2000) and(2000Ͳ2010)and
DOF Table EͲ5 (2011Ͳ2015) when available
3. DWR Population Tool
4. Other
DWR recommends preͲreview
2. PersonsͲperͲConnection Method
14.B.
Population
Year 1 1995 26,915
Year 2 1996 27,215
Year 3 1997 27,485
Year 4 1998 27,729
Year 5 1999 27,948
Year 6 2000 28,139
Year 7 2001 27,881
Year 8 2002 28,259
Year 9 2003 28,594
Year 10 2004 27,763
Year 11
Year 12
Year 13
Year 14
Year 15
Year 1 2003 28,594
Year 2 2004 27,763
Year 3 2005 28,125
Year 4 2006 28,480
Year 5 2007 28,268
31,873
Year
2015
SB X7Ͳ7 Table 3: Service Area Population
10 to 15 Year Baseline Population
5 Year Baseline Population
2015 Compliance Year Population
NOTES:
14.B.
Exported
Water
Change in
Dist. System
Storage
(+/Ͳ)
Indirect
Recycled
Water
This column will
remain blank
until SB X7Ͳ7
Table 4ͲB is
completed.
Water
Delivered for
Agricultural
Use
Process Water
This column will
remain blank
until SB X7Ͳ7
Table 4ͲD is
completed.
Year 1 1995 5,643 Ͳ Ͳ5,643 Year 2 1996 5,958 Ͳ Ͳ5,958 Year 3 1997 5,863 Ͳ Ͳ5,863 Year 4 1998 4,800 Ͳ Ͳ4,800 Year 5 1999 5,398 Ͳ Ͳ5,398 Year 6 2000 5,446 Ͳ Ͳ5,446 Year 7 2001 5,482 Ͳ Ͳ5,482 Year 8 2002 5,598 Ͳ Ͳ5,598 Year 9 2003 5,459 Ͳ Ͳ5,459 Year 10 2004 5,710 Ͳ Ͳ5,710 Year 11 0 Ͳ Ͳ Ͳ Ͳ Year 12 0 Ͳ Ͳ Ͳ Ͳ Year 13 0 Ͳ Ͳ Ͳ Ͳ Year 14 0 Ͳ Ͳ Ͳ Ͳ Year 15 0 Ͳ Ͳ Ͳ Ͳ 5,536
Year 1 2003 5,459 Ͳ Ͳ5,459 Year 2 2004 5,710 Ͳ Ͳ5,710 Year 3 2005 5,365 Ͳ Ͳ5,365 Year 4 2006 5,493 Ͳ Ͳ5,493 Year 5 2007 5,314 Ͳ Ͳ5,314 5,468
3,750Ͳ Ͳ Ͳ 3,750 * NOTE that the units of measure must remain consistent throughout the UWMP,as reported in Table 2Ͳ3 NOTES:
SB X7Ͳ7 Table 4: Annual Gross Water Use *
2015
10 to 15 Year BaselineͲGross Water Use
10Ͳ15 year baseline average gross water use
5 Year BaselineͲGross Water Use
5 year baseline average gross water use
2015 Compliance YearͲGross Water Use
Baseline Year
Fm SB X7Ͳ7 Table 3
Volume Into
Distribution
System
This column will
remain blank
until SB X7Ͳ7
Table 4ͲA is
completed.
Annual
Gross
Water Use
Deductions
14.B.
Volume
Entering
Distribution
System
Meter Error
Adjustment*
Optional
(+/Ͳ)
Corrected
Volume
Entering
Distribution
System
Year 1 1,995 0 0
Year 2 1,996 0 0
Year 3 1,997 0 0
Year 4 1,998 0 0
Year 5 1,999 595 595
Year 6 2,000 398 398
Year 7 2,001 745 745
Year 8 2,002 641 641
Year 9 2,003 460 460
Year 10 2,004 26 26
Year 11 Ͳ 0
Year 12 Ͳ 0
Year 13 Ͳ 0
Year 14 Ͳ 0
Year 15 Ͳ 0
Year 1 2,003 460 460
Year 2 2,004 26 26
Year 3 2,005 35 35
Year 4 2,006 94 94
Year 5 2,007 0 0
00 Name of Source EMWD
SB X7Ͳ7 Table 4ͲA:Volume Entering the Distribution
Baseline Year
Fm SB X7Ͳ7 Table 3
2015
* Meter Error AdjustmentͲSee guidance in Methodology 1, Step 3 of Methodologies Document
NOTES:
This water source is:
The supplier's own water source
A purchased or imported source
10 to 15 Year BaselineͲWater into Distribution System 5 Year BaselineͲWater into Distribution System
2015 Compliance YearͲWater into Distribution System
14.B.
Volume
Entering
Distribution
System
Meter Error
Adjustment*
Optional
(+/Ͳ)
Corrected
Volume
Entering
Distribution
System
Year 1 1995 5,643 5,643
Year 2 1996 5,958 5,958
Year 3 1997 5,863 5,863
Year 4 1998 4,800 4,800
Year 5 1999 4,803 4,803
Year 6 2000 5,048 5,048
Year 7 2001 4,737 4,737
Year 8 2002 4,957 4,957
Year 9 2003 4,999 4,999
Year 10 2004 5,684 5,684
Year 11 0 Ͳ
Year 12 0 Ͳ
Year 13 0 Ͳ
Year 14 0 Ͳ
Year 15 0 Ͳ
Year 1 2003 4,999 4,999
Year 2 2004 5,684 5,684
Year 3 2005 5,330 5,330
Year 4 2006 5,399 5,399
Year 5 2007 5,314 5,314
3,750 3,750
SB X7Ͳ7 Table 4ͲA:Volume Entering the Distribution
System(s)
Complete one table for each source.
10 to 15 Year BaselineͲWater into Distribution System 5 Year BaselineͲWater into Distribution System
2015 Compliance YearͲWater into Distribution System
Name of Source
Baseline Year
Fm SB X7Ͳ7 Table 3
* Meter Error AdjustmentͲSee guidance in Methodology 1, Step 3 of Methodologies Document
NOTES:
This water source is:
The supplier's own water source
A purchased or imported source
2015
San Jacinto Ground Water Basin
14.B.
Service Area
Population
Fm SB X7Ͳ7
Table 3
Annual Gross
Water Use
Fm SB X7Ͳ7
Table 4
Daily Per
Capita Water
Use (GPCD)
Year 1 1995 26,915 5,643 187 Year 2 1996 27,215 5,958 195 Year 3 1997 27,485 5,863 190 Year 4 1998 27,729 4,800 155 Year 5 1999 27,948 5,398 172 Year 6 2000 28,139 5,446 173 Year 7 2001 27,881 5,482 176 Year 8 2002 28,259 5,598 177 Year 9 2003 28,594 5,459 170 Year 10 2004 27,763 5,710 184 Year 11 0 Ͳ Ͳ Year 12 0 Ͳ Ͳ Year 13 0 Ͳ Ͳ Year 14 0 Ͳ Ͳ Year 15 0 Ͳ Ͳ 178
Service Area
Population
Fm SB X7Ͳ7
Table 3
Gross Water Use
Fm SB X7Ͳ7
Table 4
Daily Per
Capita Water
Use
Year 1 2003 28,594 5,459 170 Year 2 2004 27,763 5,710 184 Year 3 2005 28,125 5,365 170 Year 4 2006 28,480 5,493 172 Year 5 2007 28,268 5,314 168 173
31,873 3,749 105 NOTES:
5 Year Average Baseline GPCD
2015 Compliance Year GPCD
2015
Baseline Year
Fm SB X7Ͳ7 Table 3
SB X7Ͳ7 Table 5: Gallons Per Capita Per Day (GPCD)
Baseline Year
Fm SB X7Ͳ7 Table 3
10 to 15 Year Baseline GPCD
10Ͳ15 Year Average Baseline GPCD
5 Year Baseline GPCD
14.B.
178
173
2015 Compliance Year GPCD 105
SB X7Ͳ7 Table 6: Gallons per Capita per Day
Summary From Table SB X7Ͳ7 Table 5
10Ͳ15 Year Baseline GPCD
5 Year Baseline GPCD
NOTES:
14.B.
Supporting Documentation
Method 1 SB X7Ͳ7 Table 7A
Method 2 SB X7Ͳ7 Tables 7B, 7C, and 7D
Contact DWR for these tables
Method 3 SB X7Ͳ7 Table 7ͲE
Method 4 Method 4 Calculator
SB X7Ͳ7 Table 7: 2020 Target Method
Select Only One
Target Method
NOTES:
14.B.
10Ͳ15 Year Baseline
GPCD
2020 Target
GPCD
178 142
SB X7Ͳ7 Table 7ͲA: Target Method 1
20% Reduction
NOTES:
14.B.
Agency May
Select More
Than One as
Applicable
Percentage of
Service Area
in This
Hydrological
Region
Hydrologic Region
"2020 Plan"
Regional
Targets
Method 3
Regional
Targets
(95%)
North Coast 137 130
North Lahontan 173 164
Sacramento River 176 167
San Francisco Bay 131 124
San Joaquin River 174 165
Central Coast 123 117
Tulare Lake 188 179
South Lahontan 170 162
100% South Coast 149 142
Colorado River 211 200
142
SB X7Ͳ7 Table 7ͲE: Target Method 3
Target
(If more than one region is selected, this value is calculated.) NOTES:
14.B.
5 Year
Baseline GPCD
From SB X7Ͳ7
Table 5
Maximum 2020
Target1
Calculated
2020 Target2
Confirmed
2020 Target
173 164 139 139
SB X7Ͳ7 Table 7ͲF: Confirm Minimum Reduction for 2020 Target 1 Maximum 2020 Target is 95% of the 5 Year Baseline GPCD 2 2020 Target is calculated based on the selected Target Method, see SB X7Ͳ7 Table 7 and corresponding tables for agency's calculated target. NOTES:
14.B.
Confirmed
2020 Target
Fm SB X7Ͳ7
Table 7ͲF
10Ͳ15 year
Baseline GPCD
Fm SB X7Ͳ7
Table 5
2015 Interim
Target GPCD
139 178 158
SB X7Ͳ7 Table 8: 2015 Interim Target GPCD
NOTES:
14.B.
Extraordinary
Events
Weather
Normalization
Economic
Adjustment
158 105
From
Methodology 8
(Optional)
From
Methodology 8
(Optional)
From
Methodology
8 (Optional)
Ͳ 105 105 YES
Optional Adjustments (in GPCD)
SB
NOTES:
X7Ͳ7 Table 9: 2015 Compliance
Did Supplier
Achieve
Targeted
Reduction for
2015?
Actual 2015
GPCD
2015 Interim
Target GPCD
2015 GPCD
(Adjusted if
applicable)
TOTAL
Adjustments
Adjusted 2015
GPCD
Enter "0" if Adjustment Not Used
14.B.
APPENDIX H
SB X7-7 2020 Compliance Form
2025 URBAN WATER MANAGEMENT PLAN
For the City of Hemet
July 2026
14.B.
SB X7-7 2020 Compliance Form
The SB X7-7 2020 Compliance Form is for the calculation of 2020 compliance only. All retail suppliers must complete the SB X7-7 Compliance Form. Baseline and target calculations are done in the SB X 7-7 Verification Form.
The SB X7-7 Verification Form is for the calculation of baselines and targets and is a separate workbook from the SB X7-7 2020 Compliance Form.
Most Suppliers will have completed the SB X7-7 Verification Form with their 2015 UWMP and do not need to complete this form again in 2020. See Chapter 5 Section 5.3 of the UWMP Guidebook for more information regarding which Suppliers must, or may, complete the SB X7-7 Verification Form for their 2020 UWMP. 2020 compliance calculations are done in the SB X7-7 2020 Compliance Form.
The data from the tables below will not be entered into WUE Data Portal tables. These tables will be submitted as separate uploads, in Excel, to WUE Data Portal.
Process Water Deduction
SB X7-7 tables 4-C, 4-C.1, 4-C.2, 4-C.3, 4-C.4 and 4-D
A supplier that will use the process water deduction will complete the appropriate tables in Excel, submit them as a separate upload to the WUE Data Portal, and include them in its UWMP.
WUE Data Portal Entry Exceptions
14.B.
SB X7-7 Table 0: Units of Measure Used in 2020 UWMP*
(select one from the drop down list)
Acre Feet
*The unit of measure must be consistent throughout the UWMP, as reported in Submittal Table 2-3.
NOTES:
14.B.
NOTES:
SB X7-7 Table 2: Method for 2020 Population Estimate
Method Used to Determine 2020 Population
(may check more than one)
1. Department of Finance (DOF) or
American Community Survey (ACS)
3. DWR Population Tool
4. Other
DWR recommends pre-review
2. Persons-per-Connection Method
14.B.
2020 30,433
SB X7-7 Table 3: 2020 Service Area Population
2020 Compliance Year Population
NOTES:
14.B.
Exported
Water *
Change in
Dist.
System
Storage*
(+/-)
Indirect
Recycled
Water
This column
will remain
blank until SB
X7-7 Table 4-B
is completed.
Water
Delivered
for
Agricultural
Use*
Process
Water
This column will
remain blank
until SB X7-7
Table 4-D is
completed.
3,891 - - 3,891
NOTES:
SB X7-7 Table 4: 2020 Gross Water Use
2020 Volume
Into
Distribution
System
This column will
remain blank
until SB X7-7
Table 4-A is
completed.
2020 Gross Water
Use
2020 Deductions
* Units of measure (AF, MG , or CCF) must remain consistent throughout the UWMP, as reported in SB X7-7 Table 0 and Submittal Table 2-3.
Compliance
Year 2020
14.B.
Volume Entering
Distribution System 1
Meter Error
Adjustment 2
Optional
(+/-)
Corrected Volume
Entering
Distribution
System
- 2,603 2,603
SB X7-7 Table 4-A: 2020 Volume Entering the Distribution System(s), Meter Error Adjustment
Complete one table for each source.
Name of Source
1 Units of measure (AF, MG , or CCF) must remain consistent throughout the UWMP, as reported in SB X7-7 Table 0 and Submittal Table 2-3.
2 Meter Error Adjustment - See guidance in Methodology 1, Step 3 of Methodologies Document NOTES:
This water source is (check one) :
The supplier's own water source
A purchased or imported source
San Jacinto Basin Groundwater
Compliance Year
2020
Volume Entering
Distribution System 1
Meter Error
Adjustment 2
Optional
(+/-)
Corrected Volume
Entering
Distribution
System
1,288 1,288
This water source is (check one) :
The supplier's own water source
NOTES:
Name of Source Eastern Municipal Water District
SB X7-7 Table 4-A: 2020 Volume Entering the Distribution System(s) Meter Error Adjustment
Complete one table for each source.
A purchased or imported source
1 Units of measure (AF, MG , or CCF) must remain consistent throughout the UWMP, as reported in SB X7-7 Table 0 and Submittal Table 2-3.
2 Meter Error Adjustment - See guidance in Methodology 1, Step 3 of Methodologies Document Compliance Year
2020
14.B.
Volume
Discharged
from
Reservoir for
Distribution
System
Delivery1
Percent
Recycled
Water
Recycled
Water
Delivered
to
Treatment
Plant
Transmission/
Treatment
Loss1
Recycled
Volume
Entering
Distribution
System from
Surface
Reservoir
Augmentation
Recycled
Water
Pumped
by
Utility1,2
Transmission/
Treatment
Losses1
Recycled
Volume
Entering
Distribution
System from
Groundwater
Recharge
- - - -
1 Units of measure (AF, MG , or CCF) must remain consistent throughout the UWMP, as reported in SB X7-7 Table 0 and Submittal Table 2-3. 2 Suppliers will provide supplemental sheets to document the calculation for their input into "Recycled Water Pumped by Utility". The volume reported in this cell must be less than total groundwater pumped - See Methodology 1, Step 8, section 2.c.
SB X7-7 Table 4-B: 2020 Indirect Recycled Water Use Deduction (For use only by agencies that are deducting indirect recycled water) 2020 Surface Reservoir Augmentation
Total Deductible
Volume of Indirect
Recycled Water
Entering the
Distribution System
2020 Groundwater Recharge
2020 Compliance
Year
14.B.
Criteria 1- Industrial water use is equal to or greater than 12% of gross water use.
Complete SB X7-7 Table 4-C.1
Criteria 2 - Industrial water use is equal to or greater than 15 GPCD.
Complete SB X7-7 Table 4-C.2
Criteria 3 - Non-industrial use is equal to or less than 120 GPCD.
Complete SB X7-7 Table 4-C.3
Criteria 4 - Disadvantaged Community.
Complete SB x7-7 Table 4-C.4
SB X7-7 Table 4-C: 2020 Process Water Deduction Eligibility (For use only by agencies that are deducting process water) Choose Only One NOTES:
14.B.
2020 Gross
Water Use
Without
Process
Water
Deduction
2020
Industrial
Water Use
Percent
Industrial
Water
Eligible
for
Exclusion
Y/N
3,891 0% NO
NOTES:
SB X7-7 Table 4-C.1: 2020 Process Water Deduction Eligibility (For use only by agencies that are deducting process water using Criteria 1) Criteria 1
Industrial water use is equal to or greater than 12% of gross water use 2020 Compliance
Year
14.B.
2020
Industrial
Water Use
2020
Population
2020
Industrial
GPCD
Eligible for
Exclusion Y/N
30,433 - NO
NOTES:
SB X7-7 Table 4-C.2: 2020 Process Water Deduction Eligibility (For use only by agencies that are deducting process water using Criteria 2) Criteria 2
Industrial water use is equal to or greater than 15 GPCD 2020 Compliance
Year
14.B.
2020 Gross
Water Use
Without
Process
Water
Deduction
Fm SB X7-7
Table 4
2020
Industrial
Water Use
2020 Nonindustrial
Water Use
2020
Population
Fm SB X7-7
Table 3
NonIndustrial
GPCD
Eligible for
Exclusion
Y/N
3,891 3,891 30,433 114 YES
NOTES:
Criteria 3
Non-industrial use is equal to or less than 120 GPCD
SB X7-7 Table 4-C.3: 2020 Process Water Deduction Eligibility (For use only by agencies that are deducting process water using Criteria 3) 2020 Compliance
Year
14.B.
Service Area
Median
Household
Income
Percentage
of Statewide
Average
Eligible for
Exclusion? Y/N
2020 $75,235 0% YES
NOTES
California Median
Household Income*
*California median household income 2015 -2019 as reported in US Census Bureau QuickFacts.
SB X7-7 Table 4-C.4: 2020 Process Water Deduction Eligibility (For use only by agencies that are deducting process water using Criteria 4) Criteria 4
Disadvantaged Community. A “Disadvantaged Community” (DAC) is a community with a median household income less than 80 percent of the statewide average.
SELECT ONE
"Disadvantaged Community" status was determined using one of the methods listed below:
If using the IRWM DAC Mapping Tool, include a screen shot from the tool showing that the service area is considered a DAC.
1. IRWM DAC Mapping tool https://gis.water.ca.gov/app/dacs/
2. 2020 Median Income
14.B.
Industrial
Customer's Total
Water Use *
Total Volume
Provided by
Supplier*
% of Water
Provided by
Supplier
Customer's
Total Process
Water Use*
Volume of Process
Water Eligible for
Exclusion for this
Customer
-
Compliance Year
2020
NOTES:
* Units of measure (AF, MG , or CCF) must remain consistent throughout the UWMP, as reported in SB X7-7 Table 0 and Submittal Table 2-3.
Name of Industrial Customer
SB X7-7 Table 4-D: 2020 Process Water Deduction - Volume Complete a separate table for each industrial customer with a process water exclusion
14.B.
2020 Gross Water
Fm SB X7-7 Table 4
2020 Population
Fm SB X7-7 Table 3
2020 GPCD
30,433 3,891 114
SB X7-7 Table 5: 2020 Gallons Per Capita Per Day
(GPCD)
NOTES:
14.B.
Extraordinary
Events1
Weather
Normalization1
Economic
Adjustment1
114 - - - 114 - 139 YES
NOTES:
1 All values are reported in GPCD
2 2020 Confirmed Target GPCD is taken from the Supplier's SB X7-7 Verification Form Table SB X7-7, 7-F.
SB X7-7 Table 9: 2020 Compliance
Optional Adjustments to 2020 GPCD Did Supplier
Achieve
Targeted
Reduction for
2020?
Actual 2020
GPCD1
2020 Confirmed
Target GPCD 1, 2 TOTAL
Adjustments1
Adjusted
2020 GPCD 1
(Adjusted if
applicable)
Enter "0" if Adjustment Not Used
14.B.
APPENDIX I
Groundwater Management Plan
(November 2007)
2025 URBAN WATER MANAGEMENT PLAN
For the City of Hemet
July 2026
14.B.
Hemet/San Jacinto
Groundwater Management Area
Water Management Plan
Prepared for:
in coordination with:
Prepared by:
in association with Stetson Engineers and Geoscience November 7, 2007 Water Resources & Information
Management Engineering, Inc.
14.B.
1451 River Park Drive, Suite 142, Sacramento, CA 95815
Phone: 916-564-2236 Fax: 916-564-1639
E-mail: [email protected]
www.wrime.com
Water Resources & Information
Management Engineering, Inc.
14.B.
Hemet/San Jacinto Groundwater Management Area
Water Management Plan
November 7, 2007
Prepared for:
Eastern Municipal Water District
Lake Hemet Municipal Water District
City of Hemet
City of San Jacinto
in coordination with
California Department of Water Resources
Prepared by:
Water Resources & Information Management Engineering, Inc. (WRIME)
1451 River Park Drive, Suite 142
Sacramento, CA 95815
in association with:
Stetson Engineers
Geoscience
Project Management Team
Behrooz Mortazavi, EMWD
Ali Taghavi, WRIME
Technical Team Legal Team
Jim Blanke, WRIME Art Littleworth, Best Best & Krieger
John Loncar, LHMWD Gerry Shoaf, Redwine & Sherrill
Steve Johnson, Stetson Engineers Eric Vale, Burke, Williams, Sorenson Dennis Williams, Geoscience Bob Hargreaves, Best Best & Krieger Facilitation
Dale Schafer, Center for Collaborative Policy
Department of Water Resources
Eric Hong, DWR
Maurice Hall, DWR
Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
(This Page Left Blank Intentionally)
Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
TABLE OF CONTENTS
TABLE OF CONTENTS............................................................................................................................i List of Figures.....................................................................................................................................vii List of Tables .......................................................................................................................................ix Selected Acronyms, Abbreviations, and Terminology .................................................................. x EXECUTIVE SUMMARY ........................................................................................................................ 1 Background and Goals........................................................................................................................ 1 Groundwater as a Cornerstone for Water Management ............................................................... 2 Integration of Groundwater with Other Water Sources and Demand Management to Meet Future Water Needs .................................................................................................................. 2 Physical Solution is the Basis of Water Supply Project in the Management Area ..................... 4 A Firm Legal and Institutional Arrangement.................................................................................. 5 Implementation and Plan Evolution................................................................................................. 6 SECTION 1 INTRODUCTION.............................................................................................................. 9
1.1 Project Background ................................................................................................................ 9
1.2 Water Management Plan..................................................................................................... 11
1.3 Physical Solution .................................................................................................................. 11
1.4 Water Management Plan Goals.......................................................................................... 12 SECTION 2 MANAGEMENT PLAN FRAMEWORK..................................................................... 13
2.1 Management Area ................................................................................................................ 13
2.2 Management Plan Participants........................................................................................... 13
2.2.1 Public Agencies........................................................................................................ 13
2.2.2 Private Water Producers......................................................................................... 17
2.2.3 Role of State of California Department of Water Resources ............................. 19
2.2.4 Public Participation ................................................................................................. 19
2.3 Previous Agreements and Institutional Bodies................................................................ 19
2.3.1 Fruitvale Judgment and Decree............................................................................. 19
2.3.2 Hemet/San Jacinto Groundwater Association ................................................... 20
2.4 Active Institutional Bodies.................................................................................................. 21
2.4.1 Hemet/San Jacinto Policy Committee.................................................................. 21 i Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Table of Contents
2.4.2 Hemet/San Jacinto Technical Committee............................................................ 21
2.4.3 Hemet/San Jacinto Consultant-Attorney-Managers Committee..................... 22
2.5 Related Groundwater Management Activities ................................................................ 22 SECTION 3 WATER MANAGEMENT PLAN ELEMENTS........................................................... 27
3.1 Management Plan Goals...................................................................................................... 27
3.1.1 Address Pumping Overdraft and Declining Groundwater Levels.................. 27
3.1.2 Provide for Soboba Prior and Paramount Water Rights.................................... 28
3.1.3 Ensure Reliable Water Supply............................................................................... 28
3.1.4 Provide for Planned Urban Growth ..................................................................... 28
3.1.5 Protect and Enhance Water Quality ..................................................................... 29
3.1.6 Develop Cost-Effective Water Supply.................................................................. 29
3.1.7 Provide Adequate Monitoring for Water Supply and Water Quality ............. 29
3.1.8 Supersede the Fruitvale Judgment and Decree................................................... 30
3.2 Water Management Plan Strategies................................................................................... 30
3.2.1 Reduce Public Agency Native Groundwater Production ................................. 30
3.2.2 Implement the San Jacinto River Recharge and Recovery Project ................... 31
3.2.3 Implement Groundwater Replenishment Program ........................................... 34
3.2.4 Expand the Use of Recycled Water....................................................................... 35
3.2.5 Provide for Reliable Water Supply to Meet the Future Demand ..................... 36
3.2.6 Implement Additional Water Conservation Measures...................................... 36
3.2.7 Implement and Expand Monitoring Program .................................................... 36 SECTION 4 STATE OF THE MANAGEMENT AREA ................................................................... 41
4.1 Geography and Climate ...................................................................................................... 41
4.1.1 Geography................................................................................................................ 41
4.1.2 Climate...................................................................................................................... 43
4.2 Surface Water Conditions ................................................................................................... 46
4.3 Geology.................................................................................................................................. 48
4.4 Delineation of Management Zones.................................................................................... 50
4.5 Soils......................................................................................................................................... 51
4.6 Groundwater Conditions .................................................................................................... 55
4.6.1 Artificial Recharge Operations .............................................................................. 55
4.6.2 Groundwater Levels and Flow.............................................................................. 56
4.6.3 Groundwater Budget .............................................................................................. 64
4.6.4 Land Subsidence...................................................................................................... 67 ii Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Table of Contents
4.7 Land Use................................................................................................................................ 68
4.8 Current Water Supplies ....................................................................................................... 71
4.8.1 Groundwater............................................................................................................ 71
4.8.2 Imported Water ....................................................................................................... 80
4.8.3 Recycled Water ........................................................................................................ 81
4.8.4 Surface Water........................................................................................................... 82
4.8.5 Purchases from EMWD .......................................................................................... 83
4.9 Estimates of Safe Yield and Overdraft .............................................................................. 83
4.9.1 Safe Yield .................................................................................................................. 83
4.9.2 Overdraft .................................................................................................................. 88
4.10 Water Quality Conditions ................................................................................................... 88 SECTION 5 PROJECTED WATER DEMANDS AND FUTURE PLAN PHASES ..................... 95
5.1 Projected Land Use Conditions .......................................................................................... 95
5.2 Projected Water Demands................................................................................................... 97
5.2.1 EMWD....................................................................................................................... 97
5.2.2 LHMWD ................................................................................................................... 98
5.2.3 City of Hemet Water Service Area........................................................................ 99
5.2.4 City of San Jacinto ................................................................................................... 99
5.2.5 Soboba Tribe........................................................................................................... 100
5.2.6 Private Water Producers....................................................................................... 101
5.2.7 Management Area................................................................................................. 101
5.3 Future Plan Phases ............................................................................................................. 102
5.3.1 San Jacinto River Integrated Recharge and Recovery Project, Phase II......... 102
5.3.2 Potential Conjunctive Use Projects ..................................................................... 104
5.3.3 Direct Recharge Projects....................................................................................... 105
5.3.4 In-Lieu Projects ...................................................................................................... 110 SECTION 6 GROUNDWATER RIGHTS ........................................................................................ 113
6.1 Public Agencies Base Production Rights......................................................................... 113
6.1.1 General.................................................................................................................... 113
6.1.2 EMWD Base Production Rights .......................................................................... 114
6.1.3 LHMWD Base Production Rights ....................................................................... 115
6.1.4 City of Hemet Base Production Rights............................................................... 115
6.1.5 City of San Jacinto Base Production Rights ....................................................... 115
6.2 Private Water Producer’s Production Rights ................................................................. 115 iii Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Table of Contents
6.2.1 General.................................................................................................................... 115
6.2.2 Class A Production Rights ................................................................................... 116
6.2.3 Class B Production Rights.................................................................................... 116
6.3 Soboba Tribe Water Rights................................................................................................ 117 SECTION 7 SURFACE WATER RIGHTS........................................................................................ 119
7.1 LHMWD’s Diversion Rights............................................................................................. 119
7.1.1 Lake Hemet ............................................................................................................ 119
7.1.2 South Fork of the San Jacinto River .................................................................... 119
7.1.3 North Fork of the San Jacinto River.................................................................... 121
7.1.4 Strawberry Creek................................................................................................... 121
7.2 EMWD’s Diversion Rights ................................................................................................ 121 SECTION 8 SOBOBA TRIBE SETTLEMENT REQUIREMENTS .............................................. 123
8.1 Original Soboba Claim....................................................................................................... 123
8.1.1 Early Negotiations................................................................................................. 123
8.1.2 United States Settlement Proposal ...................................................................... 123
8.1.3 Tribal Claim Against MWD................................................................................. 123
8.1.4 MWD’s Cross Complaint ..................................................................................... 123
8.1.5 Final Negotiations ................................................................................................. 124
8.1.6 Status of Congressional Approval ...................................................................... 124
8.2 Framework of the Settlement Agreement....................................................................... 124
8.3 Tribal Water Right.............................................................................................................. 124
8.4 Payments to the Tribe ........................................................................................................ 124
8.5 Funds Received by the Local Agencies ........................................................................... 124
8.6 Imported Water .................................................................................................................. 125
8.6.1 MWD Storage Right .............................................................................................. 125
8.6.2 Use of MWD Supply ............................................................................................. 125
8.7 Water Quality Requirements ............................................................................................ 125
8.8 Property Transactions........................................................................................................ 125
8.9 Approval of Water Management Plan ............................................................................ 125 SECTION 9 INSTITUTIONAL PLAN.............................................................................................. 127
9.1 Purpose ................................................................................................................................ 127
9.2 Watermaster ........................................................................................................................ 127
9.2.1 Composition........................................................................................................... 127 iv Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Table of Contents
9.2.2 Terms of Office....................................................................................................... 127
9.2.3 Removal and Replacement................................................................................... 127
9.2.4 Voting...................................................................................................................... 127
9.3 Rules and Regulations ....................................................................................................... 128
9.4 Meetings............................................................................................................................... 128
9.5 Watermaster Organization................................................................................................ 128
9.6 General Duties .................................................................................................................... 130
9.6.1 Policy....................................................................................................................... 130
9.6.2 Water Management Plan Implementation......................................................... 130
9.6.3 Technical Oversight .............................................................................................. 131
9.7 Watermaster Interaction with EMWD............................................................................. 132
9.7.1 Contract for Services ............................................................................................. 132
9.7.2 Financial Responsibilities ..................................................................................... 132 SECTION 10 FINANCIAL PLAN ...................................................................................................... 133
10.1 Annual Budget.................................................................................................................... 133
10.2 Ownership of Facilities ...................................................................................................... 133
10.2.1 Existing Facilities................................................................................................... 133
10.2.2 Future Projects ....................................................................................................... 134
10.2.3 Use of Member Agency Assets............................................................................ 134
10.3 Assessments ........................................................................................................................ 134
10.3.1 Administrative Assessments ............................................................................... 134
10.3.2 Replenishment Assessments................................................................................ 135
10.3.3 Collections and Accounts..................................................................................... 135
10.4 Phase I Facilities Construction and Soboba Settlement Financing.............................. 136
10.4.1 EMWD Construction Cost.................................................................................... 136
10.4.2 Payments to Soboba Tribe.................................................................................... 136
10.4.3 EMWD Obligation................................................................................................. 137
10.4.4 Right to Transfer Entitlement to Use Facilities and/or Entitlement to Share in Rights to Water Not Used by Tribe .................................................................. 137
10.5 Future Capital Facilities..................................................................................................... 137 SECTION 11 IMPLEMENTATION PLAN ...................................................................................... 139
11.1 Organization........................................................................................................................ 139
11.2 Monitoring Program Implementation............................................................................. 141
11.3 Management Planning Tools ............................................................................................ 144 v Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Table of Contents
vi Hemet/San Jacinto Groundwater Management Area
Water Management Plan
11.4 Financial Administration................................................................................................... 145
11.5 Stipulated Judgment Administration .............................................................................. 146
11.6 Facilities and Projects......................................................................................................... 147
11.7 Special Projects and Studies.............................................................................................. 148
11.8 Conservation Programs ..................................................................................................... 148
11.9 Well Construction, Abandonment, and Destruction..................................................... 148
11.10 Public Participation........................................................................................................... 149
11.11 Groundwater Management Plan Components and Consistency with the California Water Code .................................................................................................................... 150
11.12 Schedule............................................................................................................................. 150 SECTION 12 REFERENCES................................................................................................................ 153 APPENDIX A. SETTLEMENT AGREEMENT
APPENDIX B. STIPULATED JUDGMENT
APPENDIX C. LIST OF GOVERNING BODIES
APPENDIX D. PRINCIPLES FOR WATER MANAGEMENT
APPENDIX E. LIST OF COMMITTEE ATTENDEES
APPENDIX F. HISTORICAL WATER SUPPLIES
APPENDIX G. EMWD LICENSE FOR SAN JACINTO RIVER DIVERSION APPENDIX H. MEMORANDA OF UNDERSTANDING
APPENDIX I. SB1938 GROUNDWATER MANAGEMENT PLAN COMPLIANCE
CHECKLIST
14.B.
Table of Contents
LIST OF FIGURES
Figure ES.1 Hemet/San Jacinto Groundwater Management Area and Management Zones.. 1 Figure ES.2 Components of Management Area Water Supply..................................................... 3 Figure ES.3 Historical and Projected Water Demand .................................................................... 4 Figure ES.4 Plan Institutional Setup ................................................................................................. 6 Figure 1.1 Management Area and Management Zones............................................................... 10 Figure 2.1 Public Agencies and Soboba Reservation.................................................................... 14 Figure 3.1 Schematic of Integrated Recharge and Recovery Program - Phase I....................... 32 Figure 4.1 San Jacinto Watershed.................................................................................................... 42 Figure 4.2 Average Annual Precipitation in Watershed .............................................................. 44 Figure 4.3 Annual Precipitation and Cumulative Departure from Mean Precipitation.......... 45 Figure 4.4 Fault Locations ................................................................................................................ 49 Figure 4.5 Soil Series.......................................................................................................................... 53 Figure 4.6 Hydrologic Soils Groups................................................................................................ 54 Figure 4.7 Annual Imported Water Recharged............................................................................. 56 Figure 4.8 Early 20th Century Groundwater Flow Direction....................................................... 57 Figure 4.9 Current Groundwater Flow Direction ......................................................................... 58 Figure 4.10 Spring 2004 Groundwater Elevation.......................................................................... 60 Figure 4.11 Location of Representative Well Hydrographs ........................................................ 61 Figure 4.12 Groundwater Elevation, Canyon Management Zone, EMWD #6 Cienega.......... 62 Figure 4.13 Groundwater Elevation, Upper Pressure Management Zone, EMWD #9 Hewitt and Evans..................................................................................................................................... 63 Figure 4.14 Groundwater Elevation, Hemet North Management Zone, EMWD #21 Old Dairyland ..................................................................................................................................... 65 Figure 4.15 Groundwater Elevation, Hemet South Management Zone, EMWD #22 Sneed .. 66 Figure 4.16 1998 Land Use................................................................................................................ 69 Figure 4.17 Population Growth in Incorporated Hemet and San Jacinto.................................. 70 Figure 4.18 Components of Hemet/San Jacinto Groundwater Balance.................................... 72 Figure 4.19 Annual Management Area Water Supplies .............................................................. 73 Figure 4.20 EMWD Historical Annual Demand ........................................................................... 73 Figure 4.21 LHMWD Historical Annual Demand........................................................................ 74 Figure 4.22 City of Hemet Water Service Area Historical Annual Demand............................. 74 Figure 4.23 City of San Jacinto Water Service Area Historical Annual Demand ..................... 75 Figure 4.24 Private Water Producers Historical Annual Demand ............................................. 75 Figure 4.25 Soboba Historical Annual Demand............................................................................ 76 Figure 4.26a Annual Groundwater Production, by Management Zone.................................... 76 Figure 4.26b Annual Groundwater Production, by Entity .......................................................... 77 Figure 4.27 Average Annual Entity Groundwater Production, by Management Zone, 1984- 2004 ............................................................................................................................................... 77 vii Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Table of Contents
Figure 4.28a EMWD 2004 Groundwater Production, Percentage by Supply Source .............. 78 Figure 4.28b LHMWD 2004 Groundwater Production, Percentage by Supply Source........... 78 Figure 4.28c City of Hemet Water Service Area 2004 Groundwater Production, Percentage by Supply Source ........................................................................................................................ 78 Figure 4.28d Soboba 2004 Groundwater Production, Percentage by Supply Source .............. 78 Figure 4.28e Private Water Producers 2004 Groundwater Production, Percentage by Supply Source.............................................................................................................................. 78 Figure 4.29a EMWD Historical Groundwater Production, Percentage by Supply Source..... 79 Figure 4.29b LHMWD Historical Groundwater Production, Percentage by Supply Source . 79 Figure 4.29c City of Hemet Water Service Area Historical Groundwater Production, Percentage by Supply Source .................................................................................................... 79 Figure 4.29d Soboba Historical Groundwater Production, Percentage by Supply Source..... 80 Figure 4.29e Private Water Producers Historical Groundwater Production, Percentage by Supply Source.............................................................................................................................. 80 Figure 4.30 Annual Imported Water Supply ................................................................................. 81 Figure 4.31 Annual Recycled Water Supply.................................................................................. 82 Figure 4.32 Annual Surface Water Supply..................................................................................... 82 Figure 4.33 Annual Sales by EMWD to Other Agencies within Management Area ............... 83 Figure 4.34 Safe Yield Estimates...................................................................................................... 87 Figure 4.35 Groundwater Production and Range of Safe Yield Estimates................................ 89 Figure 4.36 2004 Nitrate as N Concentrations in Groundwater (mg/L) ................................... 92 Figure 4.37 2004 TDS Concentrations in Groundwater (mg/L) ................................................. 93 Figure 5.1 Projected Ultimate Land Use......................................................................................... 96 Figure 5.2 EMWD Historical and Projected Demand .................................................................. 98 Figure 5.3 LHMWD Historical and Projected Demand ............................................................... 98 Figure 5.4 City of Hemet Water Service Area Historical and Projected Demand.................... 99 Figure 5.5 City of San Jacinto Water Service Area Historical and Projected Demand .......... 100 Figure 5.6 Soboba Tribe Historical and Projected Demand....................................................... 100 Figure 5.7 Private Water Producers Historical and Projected Demand .................................. 101 Figure 5.8 Management Area Historical and Projected Demand............................................. 102 Figure 5.9 Schematic of Integrated Recharge and Recovery Program - Phase II ................... 103 Figure 5.10 Location of 9 Preferred Projects ................................................................................ 106 Figure 6.1 Average Annual Groundwater Production, 1995 - 1999 ......................................... 113 Figure 7.1 Location of Surface Water Diversions........................................................................ 120 Figure 11.1 Relationships between Entities ................................................................................. 140 Figure 11.2 Stream Gages and Groundwater Monitoring Sites ................................................ 143 viii Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Table of Contents
LIST OF TABLES
Table ES.1 Public Agency Base Production Rights......................................................................... 5 Table ES.2 Implementation Schedule ............................................................................................... 7 Table ES.3 Ongoing Schedule ............................................................................................................ 7 Table 4.1 USGS Surface Water Gaging Stations ............................................................................ 47 Table 4.2 Hydrologic Soils Groups ................................................................................................. 55 Table 4.3 Groundwater Budget for the Management Area ......................................................... 67 Table 4.4 Land Use Distribution Based on the 1998 Survey........................................................ 68 Table 4.5 Published Estimates of Safe Yield for the Management Area.................................... 85 Table 4.6 Historical (1954-1973), 1997 Current (1978-1997), and 2003 Current (1984-2003) Ambient Nitrate as N and TDS Concentrations (mg/L)....................................................... 90 Table 4.7 Change in Ambient Concentration (mg/L) of Nitrate as N and TDS, Between Historical (1954-1973) and 2003 Current (1984-2003) Time Periods .................................... 91 Table 5.1 Generalized Projected Acreage in the Management Area .......................................... 97 Table 5.2 Summary of Selected Conjunctive Use Site Conditions............................................ 107 Table 6.1 Base Production Rights .................................................................................................. 114 Table 11.1 Plan Implementation Schedule ................................................................................... 151 Table 11.2 Phase I Project Construction ....................................................................................... 152 ix Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Table of Contents
SELECTED ACRONYMS, ABBREVIATIONS, AND TERMINOLOGY
Advisor independent engineering firm or a qualified individual AF acre-foot
AFY acre-feet per year
Agreement Settlement Agreement
Association Hemet/San Jacinto Groundwater Association
CAM Consultants-Attorneys-Managers
CEQA California Environmental Quality Act
cfs cubic feet per second
DWR California Department of Water Resources
EIR Environmental Impact Report
EMWD Eastern Municipal Water District
FMWC Fruitvale Mutual Water Company
GIS Geographic Information System
Hemet North Hemet North portion of the Lakeview/Hemet North IRRP Integrated Recharge and Recovery Program
JPA Joint Powers Authority
JUDGMENT Stipulated Judgment
Legal Counsel independent attorney or legal firm
LHMWD Lake Hemet Municipal Water District
Management Area Hemet/San Jacinto Groundwater Management Area MGD million gallons per day
MOU Memorandum of Understanding
MWD Metropolitan Water District of Southern California
PC Policy Committee
Plan Hemet/San Jacinto Water Management Plan
Plan Participants EMWD, LHMWD, Private Water Producers, and Cities of Hemet and San Jacinto (collectively)
Principles Principles for Water Management
Private Water Producers Property owners who are pumping groundwater pursuant to overlying water rights
Public Agencies EMWD, LHMWD, and Cities of Hemet and San Jacinto (collectively) RCFC&WCD Riverside County Flood Control and Water Conservation District RWQCB Santa Ana Regional Water Quality Control Board
RWRD Regional Water Resources Database
S.A.A. Settlement Agreement Approval
S.J.A. Stipulated Judgment Approval
Soboba Tribe Soboba Band of Luiseno Indians
TC Technical Committee
TDS Total Dissolved Solids
x Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Table of Contents
TM Technical Memorandum
TMDL Total Maximum Daily Load
Upper Pressure San Jacinto - Upper Pressure Management Zone USGS United States Geological Survey
UWMP Urban Water Management Plan
Watermaster Watermaster Governing Board
WRIME Water Resources & Information Management Engineering, Inc. xi Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Table of Contents
(This Page Left Blank Intentionally)
xii Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
EXECUTIVE SUMMARY
BACKGROUND AND GOALS
The stakeholders in the Hemet/San Jacinto Groundwater Management Area (Figure ES.1) have developed the Hemet/San Jacinto Water Management Plan (Plan) to provide a foundation that guides and supports responsible water management into the future. The Participants in the Plan are Eastern Municipal Water District (EMWD), Lake Hemet Municipal Water District (LHMWD), Cities of Hemet and San Jacinto (Public Agencies), and Private Water Producers.
Figure ES.1 Hemet/San Jacinto Groundwater
Management Area and Management Zones
Private Water Producers are those property owners who are pumping groundwater pursuant to overlying water rights, typically for agricultural or domestic uses. Private Water Producers may elect two levels of participation in the Plan, with varying levels of benefits and responsibilities, or may elect not to participate. The details on this matter are described in Section 2 of the Plan document.
The Plan, adopted by the governing bodies of the Plan Participants, has eight primary goals:
Address pumping overdraft and declining groundwater levels, Provide for Soboba Tribe prior and paramount water rights, 1 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Executive Summary
Ensure reliable water supply,
Provide for planned urban growth,
Protect and enhance water quality,
Develop cost-effective water supply,
Provide adequate monitoring for water supply and water quality, and Supersede the Fruitvale judgment and agreement.
GROUNDWATER AS A CORNERSTONE FOR WATER MANAGEMENT
The goals of the Plan are interrelated and begin with maintaining groundwater as a highquality, low-cost, flexible source of water. Efforts are needed to make this happen, as historical groundwater pumping in excess of the Safe Yield of the groundwater basin has resulted in decreasing trends in water levels. In addition, historical land and water use practices for agricultural irrigation and dairy industry waste have raised the levels of nitrates and total dissolved solids in groundwater. Safe Yield, the long-term average quantity of water that can be pumped without causing undesirable results, has been estimated at 40,000 to 45,000 AFY, while average annual production exceeds this amount by approximately 10,000 to 15,000 AFY.
The 10,000 to 15,000 AFY difference between the long-term average annual groundwater production and Safe Yield is known as overdraft, which can be responsible for creating undesirable conditions in the basin, including degradation of groundwater quality. The Plan assumes a pragmatic and economic approach in setting the target to reduce overdraft, and assumes an overdraft of 10,000 AFY. This will allow the Plan Participants and the Watermaster to initiate and adopt plans and policies to eliminate overdraft with implementation of economically feasible and cost-effective projects. The Plan intends to stabilize or reverse the decreasing trend in water levels through reducing groundwater production to a level that brings the basin production within the Safe Yield of the Management Area. Higher water levels will increase water in storage, decrease energy costs for pumping, and inhibit the migration of poor quality groundwater from surrounding basins, helping to protect groundwater quality in the Management Area.
INTEGRATION OF GROUNDWATER WITH OTHER WATER SOURCES
AND DEMAND MANAGEMENT TO MEET FUTURE WATER NEEDS
The Plan Participants have several options available to increase water supply and reliability in the Management Area. Water used in the Management Area for agricultural and domestic use comes from groundwater, surface water, imports, and recycled water. As shown on Figure ES.2, most of this water has historically been from groundwater, based on 2004 data.
This allows significant opportunities for underutilized sources, particularly recycled water and 2 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Executive Summary
winter-time imported water, to replace or augment groundwater production. The regional cooperation developed over the years is also of importance as the supply mix varies between the different water users in the Management Area; by cooperating, the water users can fully utilize their available water resources.
81%
8%
9%
2% Groundwater
Surface Water
Imported Water
Recycled Water
Figure ES.2 Components of Management Area Water Supply
The high-quality groundwater basin also plays an important role in future water availability.
Historical declines in groundwater levels are a concern and a major impetus for the development of this Plan. However, even the dewatered portion of the groundwater basin is a significant asset and allows for the full utilization of the available water supplies mentioned above. The new water supplies can be introduced into the system filling the empty portions of the groundwater basin by either substitution for pumping groundwater (in-lieu recharge) or by placing the water in the groundwater system through seepage from specially designed ponds or through injection from wells (direct recharge). Both these methods benefit the Management Area groundwater basin, which is composed of materials that can store large quantities of water and holds high quality groundwater that can be pumped for usage at a later time. A complex system of faults and other geologic features separate the groundwater system into four Management Zones (see Figure ES.1), which require some degree of individual attention in planning and designing recharge and extraction projects, based on each Management Zone’s unique attributes.
The numerous water supply opportunities along with water conservation by both the Public Agencies and Private Water Producers will be utilized to meet the current and future water needs of the Management Area. Based on the latest data and information on land and water practices, general plans, urban water management plans, and other specific plans, water demand in the Management Area is projected to increase over the course of next 15-20 years (Figure ES.3). Based on these projections, there will also be a shift from agricultural water use 3 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Executive Summary
to urban water use, resulting in more stringent water quality requirements to meet drinking water standards.
0 10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
1984198619881990199219941996199820002002200420062008201020122014201620182020 Year
Demand (AFY)
Historical Data Projected Data
Figure ES.3 Historical and Projected Water Demand
PHYSICAL SOLUTION IS THE BASIS OF WATER SUPPLY PROJECT IN
THE MANAGEMENT AREA
As described in the Stipulated Judgment, the Physical Solution is the court decreed method of managing the water supply in the Management Area to maximize the reasonable and beneficial use of the waters, eliminate overdraft, protect the prior rights of the Soboba Tribe, and provide for the substantial enjoyment of all water rights by recognizing their priorities. The Physical Solution consists of numerous water supply and conjunctive use projects, including direct and in-lieu recharge, increased use of recycled water, increased conservation, and improved monitoring. The core project in the Physical Solution is the Hemet/San Jacinto Integrated Recharge and Recovery Program (IRRP). Phase I of the IRRP has been designed, funded, the necessary environmental permits have been acquired, and construction is currently underway.
Phase II is in planning stages. The IRRP is a regional recharge and recovery program to meet the following goals:
Satisfy Prior and Paramount Soboba Tribe water rights; Offset the estimated 10,000 AFY overdraft in the Management Area; and Provide an additional 15,000 AFY to help meet the projected demand increases. 4 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Executive Summary
In addition to IRRP, the Plan identifies other projects that can potentially meet the above goals.
These include direct recharge, in-lieu recharge, and recycled water projects.
A FIRM LEGAL AND INSTITUTIONAL ARRANGEMENT
Development of a comprehensive system of water management begins with the legal and institutional framework. To meet the goal of reducing groundwater production to eliminate overdraft, the Public Agencies agreed upon some basic principles as a basis for allocating Base Production rights. Base Production rights establish the initial amount that each Public Agency would be able to pump without the need to replenish the basin. The Base Production rights are calculated on the basis of actual production by Public Agencies during 1995-99 calendar years, and adjusted for specific historical operational activities, such as:
Recharge Activities;
MWD San Jacinto Tunnel Seepage;
Fruitvale Entitlement Water Sold by EMWD to LHMWD, Hemet, and San Jacinto;
Stream Diversions;
Conveyance Water Deliveries; and
Other Considerations.
The Public Agencies have, therefore, agreed to the following Base Production Rights:
Table ES.1 Public Agency Base Production Rights
Public Agency Base Production Rights
(AFY)
Base Production Rights
(Percent)
EMWD 10,869 33.7
LHMWD 11,063 34.2
City of Hemet 6,320 19.6
City of San Jacinto 4,031 12.5
Total 32,283 100
Surface water rights are not impacted and/or changed by the Plan or any other recent agreements. LHMWD diverts water from the San Jacinto River and its tributaries through its pre-1914 water rights to meet their irrigation and municipal water demands, and EMWD has a license to divert water from the San Jacinto River for recharge purposes.
Soboba Tribal water rights are recognized throughout the Plan, and details of the monetary, water quantity, water quality, and property requirements to meet the obligations set forth in the settlement agreement with the Soboba Tribe are discussed in Section 8 of the Plan.
The Institutional Plan, discussed in Section 9 of the document, assigns the administration, 5 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Executive Summary
implementation, and monitoring of the Plan to a Watermaster. The Watermaster will consist of one elected official representing each of the Public Agencies and one representative selected by the participating Private Water Producers. The Watermaster will utilize the counsel of legal advisor, as well as provide technical oversight through an Advisor and Technical Advisory Committee. The Watermaster will utilize services of EMWD for recharge operations and administration and monitoring of the projects and the Plan. The relationships and basic responsibilities of these entities are summarized in Figure ES.4. The Watermaster will also review, approve, and adopt the annual budget, which will be funded by administrative assessments and replenishment assessments. The details of Watermaster administration are discussed in Section 9 of the Plan document.
EMWD
TECHNICAL
ADVISORY
COMMITEE
ADVISOR
WATERMASTER BOARD LEGAL
COUNSEL
Management
Evaluation
Recmmendations
Purchase water from MWD
Deliver water to recharge basins
Operation and maintain facilities and systems
Other activities related to physical operations
Data / sample collection
Lab analysis and data compilation
Meter reading / billing / collection / accounting
RECHARGE OPERATIONS ADMINISTRATION AND MONITORING
Figure ES.4 Plan Institutional Setup
IMPLEMENTATION AND PLAN EVOLUTION
The implementation of the Plan, along with any additions or modifications as may become appropriate, and all financial matters relating to Plan activities are the responsibility of the Watermaster. The implementation process can be divided into two processes: implementation and ongoing activities. The schedules for these processes are shown in Table ES.2 and Table ES.3.
6 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Executive Summary
Table ES.2 Implementation Schedule
Months after
Approval of
Stipulated
Judgment
Implementation Item
Month 1 Determine the method of selection for the Private Pumper representative.
Month 2 Select Public Agency and Private Pumper representatives.
Month 3 Hold first meeting of the Watermaster.
Contract with EMWD for Watermaster services.
Month 4 none
Month 5 none
Month 6
Retain legal council and advisor.
Prepare and adopt Rules and Regulations for its own operation as well as for the operation of the Water Management Plan and Judgment.
Review and reissue agreements and MOUs, as needed.
Upon Settlement
Agreement
Implementation
Recognize Tribal water rights.
Table ES.3 Ongoing Schedule
Timing Frequency Activity Responsibility
January 1 Annual Propose Monitoring Program. EMWD
End of January Annual Review Monitoring Program. Advisor End of February Annual Approve budget for Monitoring Program. Watermaster 1st Quarter Annual Advance payment of Administrative
Assessments. Public Agencies
1st Quarter Annual Payment of Replenishment Assessments. Public Agencies Four months
after completion
of calendar year
monitoring
Annual Submit Annual Hemet/San Jacinto
Water Management Area Report. EMWD
As needed As needed Revise safe yield. Advisor
TBD Annual Prepare, File, and Distribute Watermaster
Annual Report. Watermaster
7 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Executive Summary
(This Page Left Blank Intentionally)
8 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
SECTION 1 INTRODUCTION
1.1 PROJECT BACKGROUND
The stakeholders in the Hemet/San Jacinto Groundwater Management Area (Figure 1.1) (Management Area) have developed the Hemet/San Jacinto Water Management Plan (Plan) to provide a foundation that guides and supports responsible water management in the future.
The local stakeholders involved in the Plan include Eastern Municipal Water District (EMWD), Lake Hemet Municipal Water District (LHMWD), Cities of Hemet and San Jacinto, and Private Water Producers, collectively referred to as “Plan Participants”. EMWD, LHMWD, and the Cities of Hemet and San Jacinto are collectively referred to as “Public Agencies”.
A Policy Committee (PC) of the Plan Participants developed and adopted the Principles for Water Management (Principles), which guide the management, development, and governance of local water supplies. The adopted Principles, along with a variety of technical analyses, guided development of the Plan. The PC established the Principles based on the historical data on the operation of the groundwater basin; historical and projected water demands; and existing and potential future facilities. The California Department of Water Resources (DWR) provided financial, facilitation, and technical support to the PC.
A Technical Committee (TC) supported the PC and served as the investigative and review body to ensure that proper technical analyses were conducted to provide a defensible technical foundation for the Plan. The TC provided technical input to support decisions by the Public Agencies, Private Water Producers, and other stakeholders. DWR also provided financial and technical support to the TC.
A Consultants-Attorneys-Managers (CAM) committee served as an interim body to develop and review technical, legal, institutional, and financial documents, plans, and standards. The CAM committee discussed the technical/policy/legal issues in anticipation of evolving documents and recommendations for action by the policy makers for the PC.
EMWD and LHMWD have also worked with the Soboba Band of Luiseño Indians (Soboba Tribe) and the Federal Government to develop a Settlement Agreement (Agreement) (Appendix A) that would resolve past issues with respect to Tribal water rights and the water management practices in the basin. The Agreement will be supported by two stipulated 9 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
!
!
San Jacinto River
Diamond Valley Lake
Lake Skinner
Hemet South
Hemet North
Portion of
Lakeview-Hemet North
San Jacinto
Upper Pressure
Canyon
Hemet
San Jacinto
·|}þ79
·243 |}þ
·|}þ74
·|}þ79
Legend
Management Area
Management Zones*
Hemet North
Hemet South
Canyon
San Jacinto Upper Pressure
! Cities
Major Watercourses
Lakes and Reservoirs
Major Roads
October 2007
Hemet / San Jacinto Water Management Plan
Management Area and Management Zones
Figure 1.1
01 0.5
Miles
±
*Source: EMWD Page 1202 of 1949
14.B.
Introduction
judgments1 that will provide the legal and technical basis for future water supplies for the Soboba Tribe.
1.2 WATER MANAGEMENT PLAN
The Plan, adopted by the governing bodies of the Plan Participants, will provide a roadmap for implementation of the Physical Solution, ensure adequate and reliable sources of future water supply for the Management Area, and meet the Prior and Paramount Soboba Tribe water rights requirements. The Plan may be modified and updated in the future based on, among other things, the availability of new data, updated technical analysis, and changes in the institutional/financial structure of the stakeholders.
1.3 PHYSICAL SOLUTION
As described in the Stipulated Judgment (Appendix B), the Physical Solution is the court decreed method of managing the water supply in the Management Area to maximize the reasonable and beneficial use of the waters, eliminate overdraft, protect the prior rights of the Soboba Tribe, and provide for the substantial enjoyment of all water rights by recognizing their priorities. Therefore, the Physical Solution is a group of water supply and conjunctive use projects that would serve this purpose.
The project that is considered to be the core of the Physical Solution is Phase I of the Hemet/San Jacinto Integrated Recharge and Recovery Program (IRRP). Phase I of the IRRP has been designed, funded, and the necessary environmental permits are being acquired. Phase II is in planning stages. The complete project is designed to recharge (replenish) imported water and extract groundwater at a capacity such that the following goals are met:
1. Satisfy Prior and Paramount Soboba Tribe water rights;
2. Offset the estimated 10,000 acre-feet per year (AFY) overdraft in the Management Area; and
3. Provide an additional 15,000 AFY to help meet the projected demand increases.
Major elements of Phase I of the Project are:
Modifications to Pump Stations (Warren and Commonwealth); Construction of Pipelines;
1 These judgments are in the case of Soboba Tribe v. Metropolitan Water District, et. al.; U.S. District Court in Los Angeles, Case No. 00-04208 GAF, and in a Riverside County Superior Court action, yet to be filed.
11 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Introduction
Design and Construction of Recharge Basins;
Drilling Three Extraction Wells;
Installation of Pumps and Chlorination Equipment for Three Extraction Wells; and
Design and Drilling of Three Monitoring Wells.
Additional details on Phase I of the IRRP are presented in Section 3.2.2 of this Plan, and details on Phase II are presented in Section 5.3.1.
In addition to the San Jacinto River Integrated Recharge and Recovery Project, there are other projects that the TC has identified as potential projects to be further considered in the future as part of the Physical Solution for the Management Area. These include direct recharge and in-lieu recharge projects and are described in Section 5.3 of this Plan.
1.4 WATER MANAGEMENT PLAN GOALS
The Principles include eight primary goals for the management of water resources in the Management Area. These are:
Address pumping overdraft and declining groundwater levels, Provide for Soboba Tribe prior and paramount water rights, Ensure reliable water supply,
Provide for planned urban growth,
Protect and enhance water quality,
Develop cost-effective water supply,
Provide adequate monitoring for water supply and water quality, and Supersede the Fruitvale judgment and agreement.
12 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
SECTION 2 MANAGEMENT PLAN FRAMEWORK
This section briefly describes the geographic boundaries of the four divisions, or Management Zones, that make up the Management Area and provides a brief history and background on each of the primary stakeholder organizations. Past agreements and related activities leading to the Plan are discussed below, including the role of the state and public participation.
2.1 MANAGEMENT AREA
The Management Area is divided into four Management Zones: The Canyon, San Jacinto Upper Pressure (Upper Pressure), Hemet South, and the Hemet North portion of the Lakeview/Hemet North (Hemet North). The locations of the Management Zones are shown in Figure 1.1. The delineation of the Management Zones is based on the recent update by the Santa Ana Regional Water Quality Control Board (RWQCB) in the Water Quality Control Plan - Santa Ana River Basin (RWQCB, as amended 2004). The RWQCB defined these boundaries on the basis of hydrogeologic conditions to support implementation of specific water quality criteria.
Additional descriptions of the basin hydrogeology are provided in Section 4.
2.2 MANAGEMENT PLAN PARTICIPANTS
A map of the service areas of the Public Agencies near the Management Area and the Soboba Reservation is provided in Figure 2.1. The Plan Participants are briefly described below.
2.2.1 PUBLIC AGENCIES
EMWD, LHMWD, the City of Hemet, and the City of San Jacinto provide water service in various areas of the Canyon, Upper Pressure, Hemet South, and Hemet North Management Zones. A list of governing bodies is provided in Appendix C. Additionally, there are a number of Private Water Producers extracting groundwater for agricultural and domestic use.
2.2.1.1 Eastern Municipal Water District (EMWD)
Since its formation in 1950, EMWD has matured from a small agency primarily serving agriculture to one whose major demands come from domestic customers. In 1951, EMWD annexed to the Metropolitan Water District of Southern California (MWD). With the purchase of the Fruitvale Mutual Water Company (FMWC) in 1971, EMWD acquired all of Fruitvale’s 13 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
San Jacinto River
Diamond Valley Lake
EMWD Boundary
Lake Skinner
Hemet Lake Hemet MWD
Water Dept.
San Jacinto
Water Dept.
Soboba Indian Reservation
·|}þ79
·243 |}þ
·|}þ74
·|}þ79
Legend
Major Watercourses
EMWD Boundary
Major Roads
Management Area*
Agency Name
City of Hemet Water Dept.
City of San Jacinto Water Dept.
Lake Hemet MWD
LHMWD & Hemet
Soboba Indian Reservation
Lakes and Reservoirs
October 2007
Hemet / San Jacinto Water Management Plan
Public Agencies and Soboba Reservation
Figure 2.1
01 0.5
Miles
±
*Source: EMWD Page 1206 of 1949
14.B.
Management Plan Framework
assets including appropriative, prescriptive, and riparian water rights; water system, wells, well sites, pumps, and storage; real property, easements, rights, and interests; and franchises, permits, and licenses. Over time, the agency has continued to grow. Today, in addition to providing retail service, EMWD provides wholesale water to the seven local water agencies within its service area, including the three remaining Public Agencies in the Management Area.
As of 2005, EMWD serves approximately 113,000 retail connections, including approximately 200 agricultural connections, in a service area with an estimated population of 567,000 within the 555-square-miles, including many areas outside the Management Area. The population within EMWD’s boundaries is expected to grow to 830,000 by 2025 (EMWD, 2005a), not including the population of the Rancho California Water District.
In addition to wholesale and retail potable water supply, EMWD’s services include wastewater collection and treatment as well as water recycling. The San Jacinto Valley Regional Water Reclamation Facility is an 11 million gallons per day (MGD) plant that provides most of the treatment and water recycling capability for the Management Area.
The five-member Board of Directors comprise the governing body of EMWD and are responsible for setting the policies guiding the operations of the District. Board members are elected to four-year terms by the registered voters from five geographic divisions, which are apportioned on the basis of population distribution. Terms of service are staggered to ensure continuity; public elections are held in at least two divisions every two years. Directors must reside within the division from which they are elected.
The 2004 water use in the portion of the EMWD service area within the Management Area was 13,900 AFY, and it is projected to increase to 21,000 AFY by the year 2020 (EMWD, 2005b).
2.2.1.2 Lake Hemet Municipal Water District (LHMWD)
LHMWD was created in its present form in 1955, but its origins date back to the late 1880s. The service area covers 16,500 acres in the Hemet/San Jacinto Valley area with an additional 2,200 acres in Garner Valley. LHMWD provides water to residential and agricultural customers in its service area. All wastewater collection and treatment within the LHMWD area is performed by EMWD.
LHMWD operates the Hemet Dam and reservoir. The dam, an engineering marvel at the time of its construction in 1895, is a gravity-type, granite dam. LHMWD historically treated a portion of this surface water for domestic use, however since 1998 the surface water treatment plant has been offline and all surface water usage has been for untreated agricultural uses. 15 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Management Plan Framework
LHMWD usually maintains approximately 11.7 million gallons in storage in the Hemet/San Jacinto Valley.
LHMWD customers are represented by a publicly elected board of five directors from five divisions, representing approximately 13,700 domestic and 52 agricultural connections within a 21-square mile service area with a 2005 population of approximately 39,100. The population within the LHMWD service area is expected to grow to approximately 49,500 by 2025 (LHMWD, 2005).
The 2004 water use within the LHMWD service area was estimated to be 16,900 AFY. Due to the expected benefits of more robust conservation efforts, demand is projected to remain fairly constant over the next several years despite an increasing number of service connections.
Demand in 2020 is expected to be 16,300 AFY before increasing above the 2004 demand level in years thereafter (LHMWD, 2005).
2.2.1.3 The City of Hemet
The development of Hemet began in 1887 with the formation of the Lake Hemet Water Company and the Hemet Land Company by W. F. Whittier and E. L. Mayberry. The completion of the Hemet Dam in 1895, the formation of Lake Hemet behind the dam, and a water distribution system to and through the valley made future development of the Hemet area possible.
As of 2005, the city had a population of 78,600 with an area of approximately 26 square miles.
City of Hemet anticipates a population growth to 154,000 by 2025 (Hemet, 2006).
The City of Hemet was incorporated on January 20, 1910 with a population of 992. The city government is a Council/Manager form of government with seven elected positions, which includes five Council Members, one City Treasurer, and one City Clerk. The Mayor is elected by the Council Members and serves a one-year term. All Council Members serve a four-year term.
The City of Hemet Water Department treats and distributes water to 9,500 connections, covering 5 square miles of the city area. The 2005 population of the Water Department’s service area is 20,200 and is projected to grow to 22,300 by 2025. EMWD and LHMWD serve the remaining 21 square miles of the city, with 7,830 and 3,025 connections, respectively. All wastewater collection and treatment within the City of Hemet area is performed by EMWD.
The 2004 water use within the City of Hemet Water service area was estimated to be 6,000 AFY, and is projected to increase to 6,700 AFY by year 2020 (Hemet, 2006). 16 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Management Plan Framework
2.2.1.4 The City of San Jacinto
Incorporated in 1888, San Jacinto is one of the oldest communities in Riverside County. The city has a Council/Manager form of government with a five member Council that includes a Mayor and Vice Mayor. The City of San Jacinto Water/Wastewater Divisions are responsible for the health and safety of the community through the delivery of the potable water supply and the collection of wastewater. The city wastewater collection system is maintained by this Division while wastewater treatment service is provided by EMWD.
The 2005 population of the city was 34,100; it is anticipated the population of the city will grow to 63,600 by 2025 (San Jacinto, 2005). The City of San Jacinto Water Department serves the central portion of the city with approximately 3,700 residential and commercial service connections. The 2005 population of the Water Department’s service area is 13,200 and is projected to grow to 24,000 by 2025. The remaining portions of the city are served by EMWD and LHMWD, which have 4,636 and 475 service connections within the city boundaries, respectively.
The 2004 water use within the City of San Jacinto water service area was estimated to be 3,100 AFY, and is projected to increase to 5,100 AFY by year 2020 (San Jacinto, 2005).
2.2.2 PRIVATE WATER PRODUCERS
Private Water Producers are those property owners who are pumping groundwater pursuant to overlying water rights, typically for agricultural or domestic uses. Historically there was no comprehensive metering program in-place to monitor groundwater production and/or water use by the Private Water Producers. EMWD collected groundwater data through an informal, voluntary monitoring program. In 2004 the Hemet/San Jacinto Groundwater Monitoring Program was initiated by the Public Agencies and the DWR to collect, analyze, and compile groundwater-related data (EMWD, 2005).
It is estimated, on the basis of limited data and land use analysis, that the 2004 water use by Private Water Producers was about 22,200 AFY. This annual level of water use is unusually low, compared to a long-term average of 31,000 for 1984-2004 (WRIME, 2003a). Water use is expected to drop to approximately 16,000 AFY by 2020.
The Public Agencies recognize the overlying water rights of Private Water Producers, and the Principles provide several options for voluntary participation in the Plan by the Private Producers. For more details, please see the Principles provided in Appendix D. 17 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Management Plan Framework
There are two classes of participants, Class A and Class B; both agree to have their wells metered and to have those meters read by EMWD personnel at no cost to the participants. The two types of participants are further explained below.
2.2.2.1 Class A Participants
A Private Water Producer can sign an agreement acknowledging the existence of the Plan, while not being required to participate in Plan implementation. Class A participants are allowed to vote for and/or serve as the Private Water Producer representative on the Watermaster board. The Class A participants may continue to pump from their property without assessments by the Watermaster, so long as the water is put to a reasonable and beneficial use as authorized by California law.
The Class A participants have the right to convert to Class B during a grace period that ends 3 years after the entry of the Stipulated Judgment, and upon payment of the total assessments without interest, as if they were Class B participants to begin with.
2.2.2.2 Class B Participants
A Private Water Producer can become a Class B participant by electing to limit annual pumping to their estimated average annual production during the 1995 – 1999 calendar years and by agreeing to pay replenishment assessments on amounts in excess of that average annual production.
Like Class A Participants, Class B Participants can vote for and/or serve as the Private Water Producer’s representative on the Plan’s governing board. Additional benefits are given to Class B Participants as well. Under certain conditions, the Class B Participant can convey their Adjusted Production Right to the Plan or to a Public Agency. Also, upon conversion from agricultural to urban uses, Class B Participants would receive credits from the Public Agency toward the satisfaction of any requirements then in effect for water supplies and toward any fees associated with water supply that the Public Agency may then have in effect. For more information on production rights, please see Section 6.
2.2.2.3 Non-Participants
A Private Water Producer can elect not to participate in the Plan and not to formally acknowledge its existence. These non-participants will continue to exercise their water rights unaffected by the Plan.
18 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Management Plan Framework
2.2.3 ROLE OF STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES In June 2001, the DWR executed a Memorandum of Understanding (MOU) with EMWD, LHMWD, and the Cities of Hemet and San Jacinto. Initially, DWR worked to bring the group together to establish a mutual understanding of the issues in the Management Area. The goals of the group were determined and included the following: (i) finalizing an approach to groundwater management; (ii) settling on a mechanism to involve the Plan Participants in the water rights claim by the Soboba Tribe; (iii) agreeing on the basic components of a regional conjunctive use program; and (iv) establishing the necessary institutional structures. Major involvement of the DWR to-date include providing technical support to the TC and PC on resolving various technical and data analysis issues, providing facilitation and mediation support to the PC and the CAM committee, providing financial support on a number of studies and projects, including the Plan document.
2.2.4 PUBLIC PARTICIPATION
There have been numerous opportunities for public input into the development of the Plan.
Meetings were held for the public at the beginning of the Plan process to provide information and gather input. While the Plan was being developed, more opportunities were provided for public input, including TC and PC meetings and meetings with the Private Water Producers, all of which were open to the public. The public was also given the opportunity to review the draft of the Plan and submit comments.
2.3 PREVIOUS AGREEMENTS AND INSTITUTIONAL BODIES
During the course of history of water supply in the Management Area, there have been other agreements and institutional bodies that have been formed and operated to facilitate the management of water supplies. Following is a brief description of these agreements and institutional bodies, which are no longer active or are superseded by this Plan.
2.3.1 FRUITVALE JUDGMENT AND DECREE
The Fruitvale Judgment and Decree (The City of San Jacinto, et al., v. Fruitvale Mutual Water Company, et al., No. 51546, Riverside County) was entered into Book 72, Page 164 of Judgments, Riverside County, on June 4, 1954. Under the Judgment and Decree, FMWC could extract groundwater from an area which largely corresponds to the Canyon Management Zone without any restrictions as long as a specified criteria regarding static depth to groundwater and production limits were met. After purchase of FMWC, EMWD was subject to the 19 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Management Plan Framework
provisions of the Judgment and Decree. The Water Management Plan and related Stipulated Judgment will subsume and supersede the 1954 Fruitvale Judgment and Decree, along with any other agreements between EMWD and other agencies related to the FMWC acquisition, provided that none of the service area agreements included in the Fruitvale documents or those related to mutual aid or system interties are affect by this Plan or the Stipulated Judgment.
In 1971, EMWD purchased all of FMWC’s assets and water rights, and FMWC was dissolved.
EMWD also agreed to continue to provide to the Cities of Hemet and San Jacinto and LHMWD the amounts of water which they had been entitled to receive as shareholders in FMWC. These deliveries were known as “entitlement water” and the water was provided at a fixed rate, subject to annual adjustments. The amounts of water to be provided were:
City of Hemet: 6.39% of the greater of FMWC pumping or 9,000 AFY; City of San Jacinto: 0.38% of FMWC pumping; and
LHMWD: 3.74% of FMWC pumping.
The reporting by EMWD since the purchase of FMWC shows that an average of approximately 10,000 AFY was pumped from FMWC wells. Of this total, an average of 61% was from Upper Pressure, 33% was from Canyon, and 6% AFY was from Hemet South.
2.3.2 HEMET/SAN JACINTO GROUNDWATER ASSOCIATION
The Hemet/San Jacinto Groundwater Association (Association) was formed in 1991 to provide an over-arching organization to proactively address groundwater issues in the Management Area. The Association Board of Directors included representatives from the Private Water Producers, EMWD, LHMWD, and the Cities of Hemet and San Jacinto.
The Mission Statement and Articles of Association were approved on September 9, 1991. The Mission Statement read: The Hemet/San Jacinto Groundwater Association serves as the regional groundwater management entity for portions of the San Jacinto Valley groundwater basins. The Mission of the Association is to maintain a secure reliable and reasonably priced supply of high quality water for groundwater producers in the basin. The Association will implement its Mission by developing and applying sound groundwater basin management concepts.
With regard to the area covered by the Association, the Articles of Association state: The portions of the San Jacinto Valley Groundwater Basins shall include the Canyon area, the Intake area, and the upper pressure area, of the San Jacinto Hydrologic Subarea; the Hemet Hydrologic Subarea; and a portion of the Winchester Hydrologic Subarea. Such also being that portion of the San Jacinto Valley southeasterly of Bridge Street and northeast of one-quarter mile west of California Avenue in the area of Simpson Road, together with tributary basins, streams, and watersheds. 20 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Management Plan Framework
In May 1994, following receipt of the Soboba Band of Mission Indians water rights settlement claim, requests were submitted to the U.S. Department of the Interior by EMWD, the Association, and the Soboba Tribe, to appoint an Indian Water Rights Settlement team to participate in settlement negotiations. The activities of the Association stopped when the current negotiations took precedence.
2.4 ACTIVE INSTITUTIONAL BODIES
As part of the on-going activities leading to the development and adoption of the Principles, the Stipulated Judgment, and agreement with the Soboba Tribe, the following institutional bodies are formed:
Hemet/San Jacinto Policy Committee (PC),
Hemet/San Jacinto Technical Committee (TC), and
Hemet/San Jacinto Consultant-Attorney-Managers Committee (CAM).
Following is a brief description of each body, their role, and participants.
2.4.1 HEMET/SAN JACINTO POLICY COMMITTEE
The PC is comprised of elected officials representing EMWD, LHMWD, the Cities of Hemet and San Jacinto, and representatives of the Private Water Producers. Each entity, including the Private Water Producers, has three representatives on this committee. In the case of the Public Agencies, the PC representatives are two members of the Board of Directors or City Council and the agency or city manager. Three representatives reflecting the Private Water Producers interests (agricultural, dairy, golf course, etc.) are selected by the Private Water Producers. Each entity participates and votes as a unit in the PC. The decision making process is based on consensus. DWR provides a facilitator, a project manager, and technical experts to support and facilitate the decisions of the PC and TC members. Observers to the PC include other Private Water Producers, attorneys, and/or consultants representing various members, and representatives of the Soboba Tribe.
The list of participants in the PC at the time of adoption of this Plan is presented in Appendix E.
2.4.2 HEMET/SAN JACINTO TECHNICAL COMMITTEE
The PC formed a TC to compile, share, interpret, evaluate, and reach agreement on data; to define problems; and to address the PC's technical issues and make recommendations to the PC.
Committee membership consists of representatives assigned by the Public Agencies, the Private 21 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Management Plan Framework
Water Producers, and DWR and an engineering consultant provided by DWR as a neutral thirdparty participant. The representative from LHMWD served as the TC chairman. Through a collaborative effort, the TC developed the data set (WRIME, 2003a) that provides the basis for understanding the area’s hydrology, and has identified potentially feasible initiatives, programs, and projects to enhance the safe yield of the Management Zones.
The list of participants in the TC at the time of adoption of this Plan is presented in Appendix E.
2.4.3 HEMET/SAN JACINTO CONSULTANT-ATTORNEY-MANAGERS COMMITTEE The PC formed the CAM Committee, consisting of technical, legal, and management representatives of each Public Agency, assisted by the DWR project manager and facilitator.
The role of the CAM Committee is to facilitate the preparation of technical and legal documents in support of the Stipulated Judgment, the Agreement, and the Plan. Tasks assigned to the CAM Committee include: the development of contractual agreements and MOUs, and the evaluation of the financial impacts to the community for consideration and action by the PC.
The CAM Committee provides administrative or policy recommendations to the PC.
The list of participants in the CAM Committee at the time of adoption of this Plan is presented in Appendix E.
2.5 RELATED GROUNDWATER MANAGEMENT ACTIVITIES
There have been numerous investigations and technical analyses conducted in the Management Area. This section highlights more recent reports that were produced to support the Plan, reviewed by the TC, and used by the PC to make decisions. There has been a significant amount of work completed by the local agencies documented in the form of presentations to the PC and the TC. These include:
Analysis of EMWD Fruitvale water transfer and use by other agencies; Analysis of Conveyance (export) water from the Management Area; Reconciliation of the Groundwater Production records amongst the participants; Estimation of basin overdraft;
Review and assessment of the San Jacinto Watershed Groundwater Model; and Recycled water use and activities.
A Basin Assessment Study was undertaken in 2003 by the local stakeholders with the support of DWR in order to evaluate the existing conditions of the Management Area, evaluate likely future conditions, and develop and evaluate potential conjunctive use opportunities in the 22 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Management Plan Framework
Management Area. To support the Basin Assessment Study, the following Technical Memoranda (TM) and reports were produced:
Operational Yield Study, Hemet/San Jacinto Groundwater Management Area (WRIME, 2003d);
Technical Memorandum No. 1 (TM1), Assessment of Historical and Projected Land and Water Use Data (WRIME, 2003a);
Technical Memorandum No. 2 (TM2) - Description of Preferred Potential Conjunctive Use Projects (WRIME, 2003c);
Basin Assessment Study Executive Summary (ES) (WRIME, 2003b); and Draft Technical Memorandum No. 3 (TM3) - Analysis of Impacts of Conjunctive Use Projects (January 2004).
The Operational Yield Study, Hemet/San Jacinto Groundwater Management Area presents estimates of the operational yield of the Management Area. Several time periods were used to examine the water budgets of each Management Zone and the Management Area as a whole under various hydrologic conditions. The purpose of the report was to review the previous estimates of hydrologic water budget and reconcile differences in the previously prepared water budgets, and to achieve a consensus on the assumptions, data, methods, and yield of the basin. The long-term period of 1958-2001 was used since it had the best available data at the time and represented a balanced hydrologic period, with wet, dry, and normal periods similar in frequency to the overall historical record.
Hemet/San Jacinto Basin Assessment Study – Basin Assessment Report/Integrated Water Management Plan, Technical Memorandum No. 1 (TM 1), Assessment of Historical and Projected Land and Water Use Data presents background and available data, and analyzes the quality and utility of the data for evaluating basin conditions. The data presented in TM 1 include historical groundwater production, water diversions, water sales, and imported water. The purpose of the report was to obtain agreement on existing conditions, document assumptions, and provide a baseline for purposes of future comparison.
Hemet/San Jacinto Basin Assessment Study – Basin Assessment Report/Integrated Water Management Plan, Technical Memorandum No. 2 (TM 2), Identification and Description of Potential Conjunctive Use Projects presents the process and basis of selection of sites for further evaluation for potential conjunctive use projects. Seven sites were selected from an initial group of 15. The sites were ranked based on screening criteria that included: general site characteristics (size, recharge needs, ownership, etc.), recharge water sources, hydrogeologic suitability, sub-basin interactions, engineering suitability, land use suitability, and environmental impacts. An initial screening was also performed for two potential in-lieu projects. 23 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Management Plan Framework
Hemet/San Jacinto Basin Assessment Study – Executive Summary provides a summary of TM 1 and TM 2.
Draft Hemet/San Jacinto Basin Assessment Study – Basin Assessment Report/Integrated Water Management Plan, Technical Memorandum No. 3 (TM 3), Analysis of Impacts of Conjunctive Use Projects (January 2004) presents a summary of available information on seven potential recharge sites and two potential in-lieu sites for conjunctive use. Draft TM 3 synthesizes information from multiple sources to compare potential recharge sites and proposes preferred sites and documents any additional study or data needs. The TM 3 was presented to the TC in draft form, and comments were received. Due to initiation of the development of the Water Management Plan, the work to finalize TM 3 was re-scoped, which obviated the need to prepare a final TM 3.
Significant other work has been performed and documented by EMWD. These reports include planning documents and feasibility studies with modeling efforts:
West San Jacinto Groundwater Basin Management Plan;
Hemet/San Jacinto Water Management Area 2004 Annual Report; Hemet-San Jacinto Recharge and Recovery Program- Feasibility Study; Regional Groundwater Model for the San Jacinto Watershed; Hemet-San Jacinto Integrated Recharge and Recovery Program- Feasibility Study Groundwater Flow Model;
Lake Elsinore and Canyon Lake Nutrient Source Assessment; Groundwater Infiltration Predictions Using Surface Water Model Output for the San Jacinto Watershed;
Development of the Regional Water Resources Database (RWRD); and Preliminary Design Report for the San Jacinto Agricultural In-Lieu Water Supply Project.
West San Jacinto Groundwater Basin Management Plan (EMWD, 1995). This plan was prepared in accordance with Assembly Bill 3030. This groundwater management plan covers the western portion of the EMWD service area in the San Jacinto Watershed. Since the groundwater management in the eastern San Jacinto watershed was being developed under Association in the early 1990s, the Management Area was excluded from the AB3030 planning process. The goal of the West San Jacinto Groundwater Basin Management Plan is “to maximize the use of groundwater for all beneficial uses in such a way as to lower the cost of water supply and to improve the reliability of the total water supply for all water users in the West San Jacinto Groundwater Basin Management Area” (EMWD, 2004). Implementation of the plan included the establishment of an Advisory Committee; Management Zone prioritization; and 24 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Management Plan Framework
groundwater resources evaluation including groundwater quality and level monitoring, extraction monitoring, and hydrogeophysical investigations.
Hemet/San Jacinto Water Management Area 2004 Annual Report (EMWD, 2005b). As part of the reporting process to the Management Area stakeholder group, EMWD produces annual reports that summarize groundwater quality, level, and extraction monitoring results, and provide an update on activities and progress toward meeting the previous year’s recommendations and goals of the groundwater management plan. The first annual report for the Hemet/San Jacinto Area was produced in June 2005.
Hemet-San Jacinto Recharge and Recovery Program- Feasibility Study (Psomas, 2003). This report documents the feasibility of a proposed recharge project. The proposed Hemet/San Jacinto Integrated Recharge and Recovery Program consists of average annual recharge of 43,750 acre-feet (AF) based on long-term hydrology at a site within the City of Hemet and near the San Jacinto River’s confluences with Poppet and Bautista Creeks. This program involves the construction of approximately 15 recharge ponds on a 100-acre site in the San Jacinto River channel, construction of new pipeline facilities, upgrade of existing pump stations, and construction of new extraction wells at various locations within the Management Area. In order to assess the feasibility of the proposed program, a comparative analysis was completed to evaluate potential alternatives to the preferred option of recharging imported water.
Regional Groundwater Model for the San Jacinto Watershed (TechLink Environmental, 2002a). This report documents the development of a regional groundwater flow and transport model for the San Jacinto watershed basin within EMWD’s service area, an area that includes the Management Area as well as the areas to the west included in the West San Jacinto Groundwater Basin Management Plan. Regional Groundwater Model for the San Jacinto Watershed includes review of available data, development of a conceptual model, setup of a flow and transport model, calibration of the model, and simulation of management scenarios.
Hemet-San Jacinto Integrated Recharge and Recovery Program - Feasibility Study Groundwater Flow Model (TechLink, 2002b). This report documents the application of the regional groundwater model to evaluate the various recharge and recovery activities and alternative water supplies.
These model simulations are intended to compare project and no-project alternatives, evaluate the aquifer capability to store large volumes of water, and evaluate the availability of recharged water for extraction.
Lake Elsinore and Canyon Lake Nutrient Source Assessment (TetraTech, 2003). TetraTech developed a watershed model of the San Jacinto watershed for the Lake Elsinore and San Jacinto Watershed Authority and the RWQCB as part of the Lake Elsinore and Canyon Lake Nutrient Source Assessment. The model provided a framework for nutrient source assessment through representation of contributing land uses in a subwatershed network and subsequent 25 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Management Plan Framework
determination of required nutrient load reductions and allocations to Total Maximum Daily Load (TMDL) objectives. Relating to the Management Area, the report showed that nutrients from the Management Area only reach the lakes when Mystic Lake overflows.
Groundwater Infiltration Predictions Using Surface Water Model Output for the San Jacinto Watershed (TetraTech, 2004). This report documents the update and modification of the watershed model by TetraTech to support EMWD’s development of a groundwater model of the San Jacinto River basin to simulate aquifer storage in the region. The update and modification included extension of the modeling period from January 1984 to March 2003, division of one subwatershed into 4 subwatersheds, and modification of model output. The model was validated and scenarios were run.
Regional Water Resources Database (EMWD, 2005c). A RWRD was developed for EMWD in 2004 to house the existing and future groundwater-related records and to interface Geographic Information System (GIS) maps and aerial photographs. The RWRD contains information for groundwater levels and extraction; streamflow and diversions; well information, construction data, downhole logs, and well/aquifer pump tests; precipitation; temperature; evaporation; imported water usage and quality; conjunctive use; and water quality data from other laboratories and published reports. While no formal document is available to-date describing the full development and implementation of this project, Regional Water Resources Database presents a concise summary of the capabilities of this important component of data management in the region.
Preliminary Design Report for the San Jacinto Agricultural In-Lieu Water Supply Project (Engineering Resources of Southern California, 2005). This report details how recycled water could be incorporated into existing irrigation infrastructure and how to be consistent with the regulatory constraints associated with recycled water use. This included study of water demands, pipeline alignment and size, and environmental issues and resulted in the development of a preliminary plan and cost estimate. The preliminary plan included 13,200 feet of 24-inch pipeline serving Rancho Casa Loma and Scott Brothers Dairy Farms. Total irrigation demand from these farms is estimated at 8,640 AFY. Of this amount, the project could deliver 3,215 AFY due to limited availability of recycled water during the summer months. The project is estimated to take 13 months to complete.
26 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
SECTION 3 WATER MANAGEMENT PLAN ELEMENTS
The elements of this Plan include water management goals and a set of management strategies that discuss and identify the actions necessary for meeting the goals.
3.1 MANAGEMENT PLAN GOALS
The Plan has eight primary goals derived from the Principles and the Agreement. Each of the goals, listed below, is briefly discussed in subsequent sections:
Address pumping overdraft and declining groundwater levels, Provide for Soboba Tribe prior and paramount water rights, Ensure reliable water supply,
Provide for planned urban growth,
Protect and enhance water quality,
Develop cost-effective water supply,
Provide adequate monitoring for water supply and water quality, and Supersede the Fruitvale Judgment and Decree.
3.1.1 ADDRESS PUMPING OVERDRAFT AND DECLINING GROUNDWATER LEVELS The Principles and the Stipulated Judgment recognize that groundwater levels within the Management Area have generally been declining for a number of years, and that the Management Area is presently in a condition of groundwater overdraft. The amount of groundwater overdraft is estimated to range from 10,000 to 15,000 AFY. This Plan has a goal of reducing the overdraft in the short-term, and completely eliminating the annual overdraft in the long-term. The timeframe will depend on the extent of overdraft, as more knowledge is gained through the years. For example, a six-year period would be needed to eliminate overdraft if there is an annual overdraft of 10,000 AF.
The Principles identify management strategies to be included in the Plan to reduce overdraft and ensure a long-term supply of reliable water for current and future uses. The Plan contains both management (non-structural) and capital facility (structural) elements to reduce demand and/or increase the available supply. The management elements include: reduction in native groundwater production; enhanced recharge with local runoff, imported, and/or recycled water; and water conservation programs. Short-term planned reductions in pumping are part 27 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Water Management Plan Elements
of the Plan while further supplies are obtained through the identified management elements.
The management strategies are described in more detail in Section 3.2.
3.1.2 PROVIDE FOR SOBOBA PRIOR AND PARAMOUNT WATER RIGHTS The Agreement with the Soboba Tribe provides for financial obligations, settlement of all water rights claims, and water purchases from MWD, including infrastructure and groundwater storage. The Plan requires that all parts of the Agreement with the Soboba Tribe be met. The management elements to ensure this include: recognition of 9,000 AFY of Soboba Tribe water rights and up to 4,100 AFY of water use in Canyon and Upper Pressure Management Zones for the first 50 years from the date of Settlement, purchase of replenishment water, and MWD's long-term average delivery of 7,500 AFY of imported water.
3.1.3 ENSURE RELIABLE WATER SUPPLY
Reliability is a key component of any water supply system. This goal of the Plan is to ensure that the Public Agencies have a consensus and commitment to develop a comprehensive water supply portfolio that realizes all potential opportunities, and that plans are in place to adapt to changing demands, natural disasters, and drought conditions. Such a portfolio should rely on a range of sources of water supply and include a large component of local supply and storage.
These objectives minimize, to the extent possible, reliance on weather patterns, over-stressed aquifers, and over-allocated imported water. The Plan elements that address these goals include imported and recycled water use.
3.1.4 PROVIDE FOR PLANNED URBAN GROWTH
The Management Area, like much of the Inland Empire area of Southern California, is experiencing dramatic urbanization. The Principles and the Plan recognize and acknowledge that the Management Area will continue to experience residential, commercial, and industrial growth and development, and that the existing water production and service systems will need to be expanded to meet this growth. This urbanization will affect water supplies in several ways. Urban development on non-irrigated lands will increase water use. Urban development and conversion of irrigated lands may not significantly increase water use, but the urban water use requires a more dependable, higher quality water supply. It is estimated that at least 15,000 AFY incremental water supply capacities over the existing Base Production Rights of Public Agencies must be dedicated to adequately serve this growth. The Plan will help local communities comply with recent changes in state law effective January 2002 (SB 221 and SB 610) requiring municipal suppliers, water districts, and cities or counties to document water availability from all sources in normal, dry, and multiple dry years whenever land use decisions 28 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Water Management Plan Elements
are made. Planned urban growth, as identified in prevailing land use and general plans, or in approved Urban Water Management Plans (UWMP), provided the basis for all demand forecasts and assumptions in the Plan.
3.1.5 PROTECT AND ENHANCE WATER QUALITY
The Management Area has some of the highest quality groundwater in the San Jacinto Watershed, but it has its own problems and issues. Nitrates and Total Dissolved Solids (TDS) concentrations have historically increased as the area experienced urban and agricultural growth. As noted above, urban uses will replace agricultural uses, resulting in more stringent water quality standards for most constituents, including nitrates. The Plan seeks to meet goals for water quality through preventing degradation of the groundwater due to activities in the Management Area, and as a result of implementation of the Plan. Each of the Public Agencies also seeks to prevent degradation or to improve groundwater quality to avoid high costs for drinking water treatment.
3.1.6 DEVELOP COST-EFFECTIVE WATER SUPPLY
Equitable distribution of costs and benefits are part of the Plan. It is important that the Plan elements are selected and implemented in a way that keeps costs to a minimum so as to keep water bills as low as possible for customers. Cost management includes purchasing imported water at low rates; utilizing groundwater storage space; fully utilizing existing infrastructure; promoting conservation; efficiently implementing new infrastructure; and maintaining good quality groundwater and surface water to keep treatment costs low. The Public Agencies also seek to cost-effectively reclaim municipal wastewater for beneficial reuse whenever possible.
3.1.7 PROVIDE ADEQUATE MONITORING FOR WATER SUPPLY AND WATER QUALITY Monitoring programs will be implemented to determine if the Plan’s goals are being met; to document that anticipated benefits are being achieved; and to predict future needs. Included in the monitoring should be water quality, sampled at sufficient locations to be representative, with analysis for all constituents of concern. In addition, the monitoring program should include monitoring of water levels, well metering, and tracking of imported water and recycled water availability and deliveries. Monitoring can also be used to improve yield estimates and groundwater model performance through the development of better estimates of stream recharge and other components. The results of monitoring will be used to strengthen or relax actions needed to meet Plan goals.
29 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Water Management Plan Elements
3.1.8 SUPERSEDE THE FRUITVALE JUDGMENT AND DECREE
The Fruitvale Judgment and Decree (The City of San Jacinto, et al., v. Fruitvale Mutual Water Company, et al., No. 51546, Riverside County) was entered into Book 72, Page 164 of Judgments, Riverside County, on June 4, 1954. EMWD, as successor in interest to FMWC, is subject to the provisions of the Judgment and Decree. Provisions in the document are discussed and summarized in Section 2 of this Plan. The Stipulated Judgment and its Water Management Plan are to supersede the Fruitvale Judgment and Agreement subject to certain exceptions in Section 3.5 of the Stipulated Judgment.
3.2 WATER MANAGEMENT PLAN STRATEGIES
To meet the stated goals of the Plan, the stakeholders have adopted the following specific strategies.
3.2.1 REDUCE PUBLIC AGENCY NATIVE GROUNDWATER PRODUCTION The Public Agencies have agreed to reduce native groundwater production so that total production is within the Safe Yield of the Management Area. The average annual groundwater production in the Management Area for the hydrologic period 1958-2004 is estimated to be 54,800 AFY. The initial estimate of Safe Yield is 45,000 AF. The Public Agencies have also agreed to a 10% reduction from each Base Production Right in the first full year after entry of the Stipulated Judgment. The Public Agencies’ share of Safe Yield is calculated based on their Adjusted Production Right, and is discussed further in Section 11. Within the first six years, the Watermaster will make a determination of the Safe Yield of the Management Area. Thereafter, the Safe Yield shall be reviewed and modified, if necessary, upon the recommendation of the TC or as the Watermaster may determine. Until Adjusted Production Rights are consistent with the Public Agencies' share of Safe Yield, the Watermaster will determine the required reductions in Adjusted Production Rights in each subsequent year to achieve Safe Yield within a reasonable period of time as determined by the Watermaster. The Watermaster is to consider the extent of the overdraft, the economic impact on the parties bound by this Judgment, and other relevant factors in determining the total and pro-rata shares of Adjusted Production Rights. The goal is to achieve production at the same level as Safe Yield over a six-year period assuming an annual overdraft of 10,000 acre-feet. In the event the extent of the overdraft is different than assumed, then the period of time reasonably required to reach Safe Yield may be extended or reduced accordingly. However, in no event shall any reduction for any Public Agency be more than 10% of the Adjusted Production Rights of the prior year. 30 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Water Management Plan Elements
3.2.2 IMPLEMENT THE SAN JACINTO RIVER RECHARGE AND RECOVERY PROJECT The stakeholders have agreed that Phase I of the IRRP is the primary project considered to be the core of the Physical Solution. The stakeholders are working towards an agreement for Phase I of the IRRP project which documents their agreement on the ownership, financing, and operation of the facilities.
The information presented here is based on previously published documents adjusted when appropriate based on the latest knowledge at the time of publication of the Plan.
Phases I and II of the IRRP are designed to recharge (replenish) imported water and extract groundwater at a capacity such that the following goals are met:
Satisfy the Tribe's prior and paramount rights as set forth in the Agreement with the Tribe by providing an average annual supply of 7,500 acre-feet pursuant to the terms of such agreement. The proposed Program would provide the MWD with the right to store up to 40,000 acre-feet of imported water in the Upper Pressure Sub-basin as advance deliveries under its agreement to provide an average annual supply of 7,500 acre-feet.
Offset the existing overdraft of the Management Area, estimated at approximately 10,000 AFY.
Provide approximately an additional 15,000 AFY of water storage to help meet projected demand increases.
Major elements of Phase I of the Project are (Figure 3.1):
Modifications to Pump Stations (Warren and Commonwealth); Construction of Pipelines;
Design and Construction of Recharge Basins;
Drilling Three (3) Extraction Wells;
Installation of Pumps and Chlorination Equipment for Three (3) Extraction Well; and
Design and Installation of Three (3) Monitoring Wells.
The project is designed and implemented in two Phases. While project Phase I activities are defined in detail, Phase II of the project is defined at conceptual level and the detailed design will be developed in the future.
31 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Warren Pump Station
Commonwealth Pump Station
HEMET
SAN JACINTO
·|}þ79
·|}þ74
SAN JACINTO RIVER
October 2007
±
01 0.5
Miles
Legend
Pump StationPhase I PipelinePhase I PondsExisting PipelinePhase I Well Field Hemet / San Jacinto
Water Management
Plan
Schematic of Integrated
Recharge Recovery
Program - Phase I
Figure 3.1
Source: EMWD
14.B.
Water Management Plan Elements
3.2.2.1 Phase I
This phase of the project consists of the construction of the San Jacinto Integrated Recharge and Recovery Project, which will provide up to 42 cubic feet per second (cfs)* of recharge water capacity. Phase I is scheduled to be completed by December 2008*, and will cost approximately $16.2* million. Major activities during Phase I are:
1. Completion of Environmental Process - The Environmental Impact Report (EIR) was prepared and adopted in August of 2004. Additional permitting requirements include Section 7 consultation with USFWS and issuance of Biological Opinion by the appropriate federal agency.
2. Acquisition of Land - A 100 acre parcel has been purchased by EMWD for required habitat mitigation measures for a 35 acre* parcel that is dedicated to recharge basins. In addition, EMWD is in the process of acquiring approximately one acre of land (in several parcels) for monitoring wells.
3. Approval, Advertising, and Award of Construction Contract - The EMWD Board of Directors has approved the bidding process.
4. Drilling of Extraction Wells No. 1, 2, and 3 - This includes construction and testing of three 18-inch diameter extraction wells, each to a depth of approximately 1,000 feet.
5. Installation of Pump and Chlorination Equipment for Wells No. 1, 2, and 3 - This includes installation of pump and chlorination equipment, appurtenances and site improvements required to complete and operate the new extraction wells.
6. Modifications to the Pump Station - This includes modifications to the Warren and Commonwealth Pump Stations. The modifications include upgrades to increase pump station capacity to provide a seasonal maximum of 42 cfs* to the recharge basins.
7. Construction of Recharge Basins - This activity includes construction of six recharge ponds within the San Jacinto river bed in two clusters of three ponds each. The footprint of the recharge area will be approximately 35 acres*, along the west side of the San Jacinto River, immediately upstream of the river confluence with the Meridian Channel.
8. Construction of Pipelines - This includes design and construction of pipelines and appurtenances to convey, regulate, and meter raw imported water flows into the recharge basins. Pipelines include two (2) 24-inch diameter laterals to convey water from an existing 33-inch diameter transmission main along the proposed Ramona Expressway alignment to the first basin in each of the two basin clusters.
There will be appurtenances including regulation valves, meters to record water
* Number has been updated since the publication of the IRRP Feasibility Report. 33 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Water Management Plan Elements
flow, telemetry-based flow control systems, and discharge piping into the recharge basins.
9. Design and Construction of Monitoring Wells - Three monitoring wells will be constructed outside the river bed along the west berm. The wells are designed to monitor the vertical and lateral migration of recharge water into the underlying aquifer zones. These clustered wells will be multi-cased and perforated to monitor the groundwater levels at various depths.
The overall project size may change as a result of negotiations with regulatory agencies.
3.2.3 IMPLEMENT GROUNDWATER REPLENISHMENT PROGRAM
The groundwater aquifers in the Management Area are a valuable resource and provide many advantages to operating a reliable water supply system. For many Private Water Producers, groundwater is their sole source of water. Declining water levels increase costs for pumping water and can also cause wells to go dry, requiring deeper drilling, or can result in the intrusion of poor quality groundwater from neighboring Management Zones, rendering the groundwater unsuitable for many beneficial uses. Also, the replenishment of high quality imported water from the State Water Project or high quality runoff from the surrounding mountains can maintain or improve the quality of the groundwater in the Management Area.
Groundwater replenishment, therefore, is a major part of the water management strategies considered by the stakeholders. Replenishment efforts to increase water supply in the Management Area can be grouped into two categories:
1. Direct replenishment of groundwater to store water for future use; and
2. Augmentation of imported or recycled water supplies to provide immediate increases in water supply and the associated decrease in groundwater pumping.
Often, these categories are combined, with increases in imported or recycled water being used to replenish groundwater for future use.
3.2.3.1 Enhancing Natural Replenishment
The Management Area already receives a significant amount of natural recharge, from sources such as direct recharge from precipitation and infiltration from the San Jacinto River and its tributaries. While much of this water is able to infiltrate naturally, natural recharge could be increased by capturing surface flows during storm events, allowing the water to infiltrate over time rather than be swept out of the Management Area. As part of the Basin Assessment Study, the TC has identified and considered several conjunctive use and natural replenishment projects that have the potential to address such a water supply management strategy. These are described in Section 5.3 of the Plan.
34 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Water Management Plan Elements
3.2.3.2 Additional MWD Replenishment Water
Utilizing replenishment allows for significant cost savings when purchasing imported water from MWD. MWD provides special rates for water used for replenishment purposes. This water is available during the low-demand winter period and currently costs $238/AF for untreated water, while full-service Tier 1 & 2 untreated water currently costs $331/AF and $427/AF, respectively.
3.2.4 EXPAND THE USE OF RECYCLED WATER
Recycled water is available from EMWD’s San Jacinto Valley Regional Water Reclamation Facility. Currently, recycled water is used by agricultural users and other large-scale outdoor irrigators such as golf courses and municipal facilities in place of groundwater. The Watermaster will use recycled water as a significant part of its water supply strategy for replenishment of the groundwater basin. The Watermaster will work with EMWD to determine the operational constraints currently facing the availability of recycled water for replenishment of the basin. The recycled water is to follow the State and Federal guidelines. Future phases of the Plan include upgrade of the San Jacinto Valley Regional Water Reclamation Facility to tertiary treatment.
3.2.4.1 Continue and Expand the In-Lieu Replenishment with Recycled and/or Imported Water
In-lieu replenishment with recycled and/or imported water provides many benefits over direct replenishment of the groundwater. In-lieu involves utilizing an alternate source, in this case imported or recycled water, instead of pumping groundwater. Using in-lieu recharge means that there is no cost to pump groundwater, no land is needed for a spreading basin, and there is no constant recharge through a basin to push salts out of the unsaturated zone. Disadvantages include timing of the supplies with demand; that is, most in-lieu customers cannot use the quantity of water available during the off-peak time. To maximize use of water available for inlieu replenishment, significant infrastructure will be needed to serve the maximum number of customers. This strategy would require the Watermaster to work with EMWD, other agencies, and Private Water Producers to develop specific plans for expanding the use of recycled water for in-lieu replenishment of the basin.
35 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Water Management Plan Elements
3.2.4.2 Expand and Upgrade the San Jacinto Valley Regional Water Reclamation Facility
The San Jacinto Valley Regional Water Reclamation Facility is currently an 11 MGD plant with capability to treat wastewater to a secondary level of treatment. While this plant is scheduled for upgrade to tertiary treatment, the recycled water discharge beyond the sale to the agricultural customers is currently being disposed of in the basin. The plant is scheduled for expansion in size and upgrade of the treatment level, and the upgraded plant will have the capacity to treat 14 MGD by 2011 and 18 MGD by 2024. The Watermaster shall have the right of first refusal to purchase all recycled water produced from the treatment facilities serving the Management Area that is not subject to then existing contracts. The Watermaster will analyze the need and decide on the amount of recycled water for direct recharge and/or direct delivery.
3.2.5 PROVIDE FOR RELIABLE WATER SUPPLY TO MEET THE FUTURE DEMAND The Plan is to provide sufficient water supplies to meet future water demands in the Management Area. This strategy is tied directly to the IRRP that is designed to provide 15,000 AFY of additional supplies to meet the projected water demands. As part of this strategy, additional conjunctive use projects, identified in Section 5.3 of this Plan, will augment Phase II of the IRRP. These projects are mostly designed to capture winter run-off for recharge, unlike the IRRP that is designed to recharge imported water.
3.2.6 IMPLEMENT ADDITIONAL WATER CONSERVATION MEASURES
The current level of water conservation has significantly helped to reduce the water demand in the Management Area. In addition to the conservation measures implemented by the Public Agencies, additional conservation measures can be designed and implemented by the agricultural and dairy water users. The Watermaster, in coordination with the Agencies, should develop specific strategies for additional water conservation. In addition, they should identify practical steps and means for voluntary implementation by the agricultural and dairy water users that would help water management of the basin.
3.2.7 IMPLEMENT AND EXPAND MONITORING PROGRAM
At the heart of any water management plan is a robust monitoring program capable of assessing the status of the basin and monitoring the responses to future management actions.
EMWD, on a voluntary basis, has compiled historical groundwater elevation and quality data from mid-1950s through the present. In the early data collection efforts, the location and 36 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Water Management Plan Elements
frequency of monitoring were not as consistent as the more recent measurements. This was mostly due to the voluntary nature of participation in the monitoring program, as well as funding availability. This lack of consistency in data collection hampers rigorous and thorough analysis. However, long-term hydrographs as well as contours of groundwater levels have been produced by EMWD to present long-term trends in groundwater conditions over time, and with appropriate geographic extent.
In 2004, the Hemet/San Jacinto Groundwater Monitoring Program was initiated to collect, compile, and analyze groundwater-related data. This program was undertaken by the Public Agencies and DWR. The monitoring program provides the information necessary for a comprehensive view of the Management Area, and contains the following elements:
Groundwater Level Monitoring;
Groundwater Quality Monitoring;
Groundwater Extraction Monitoring; and
Inactive Well Capping and Sealing.
Finally, the monitoring program utilizes EMWD’s RWRD, for assembling and assessing groundwater-related data in the Management Area. All Public Agencies provide data on their wells and assist in communicating with private well owners in their respective jurisdictions to collect their data and information.
This strategy reconfirms that the monitoring program, as established in 2004, should continue and be expanded to new areas. The Stipulated Judgment requires that the Watermaster implement a monitoring program to ensure that Plan activities follow best management and engineering principles to protect Management Area water resources, and to compile and analyze data on groundwater production, water levels, water quality, and groundwater in storage. The Watermaster, in coordination with EMWD and other Public Agencies, will develop plans for expansion of the monitoring program, as well as, specific actions for implementation of the monitoring program in the Management Area. Funding for the monitoring program will come from the Administrative Assessment, as detailed in Section 10.3.1.
3.2.7.1 Groundwater Monitoring
Groundwater level and quality monitoring are valuable, but can be costly and time consuming.
A robust network of monitoring wells can be established to develop the optimum amount of data on groundwater. Some criteria to be used in the development or modification of the network may include:
37 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Water Management Plan Elements
Monitor the same well for selected seasons over many years to understand trends and variability;
Develop an unbiased distribution of monitoring wells, aerially and vertically, that account for differences in:
Topography,
Geology and soils,
Climate, and
Land Use;
Maintain supporting data to aid in analysis, including:
Meteorological data,
Hydrologic data, and
Land use data, including pumping and irrigation;
Monitor at a frequency that captures variability of water level and water quality fluctuations;
Utilize wells, to the extent possible, intended solely for groundwater monitoring, not production; and
Maintain high levels of data quality.
The Watermaster is to work cooperatively with the Public Agencies and Private Water Producers to establish an optimum network of monitoring wells for collection and analysis of groundwater trends and variability.
3.2.7.2 Surface Water Monitoring
Surface water monitoring would build on the existing cooperative program between EMWD and the United States Geological Survey (USGS). This program monitors streamflow on the San Jacinto River just upstream of State Street and on Lamb Canyon Creek near Victory Ranch. The USGS also monitors a gage on the San Jacinto River at the Cranston Ranger Station. Continued and additional surface water flow and quality monitoring would include the following criteria:
Monitor the same location for many years to understand trends and variability; Maintain supporting data to aid in analysis, including:
Meteorological data,
Groundwater data, and
Land use data, including pumping and irrigation; and
Maintain high levels of data quality.
Gaging station should be installed on reaches not currently being monitored, such as:
38 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Water Management Plan Elements
San Jacinto River near Main Street;
San Jacinto River near Highway 74 bridge crossing;
Bautista Creek near Highway 74 bridge crossing; and
Salt Creek near State Street.
The Watermaster is to work cooperatively with the Public Agencies to establish specific monitoring locations for collection and analysis of surface water trends and variability. 39 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Water Management Plan Elements
(This Page Left Blank Intentionally)
40 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
SECTION 4 STATE OF THE MANAGEMENT AREA
This section discusses the local geologic and hydrologic conditions that provide the foundation for the development of the Plan. The ability to manage available water supplies is to a large degree governed by naturally occurring conditions and the physical environment. This section further describes water supply conditions and sources; historical and current water demands; status of the groundwater basin; and summarizes water quality conditions.
4.1 GEOGRAPHY AND CLIMATE
4.1.1 GEOGRAPHY
The Management Area is located in western Riverside County, approximately 70 miles southeast of the City of Los Angeles. The area encompasses the Cities of Hemet and San Jacinto; unincorporated residential/commercial areas, including Valle Vista; and agricultural lands. State Highway 74 (Florida Avenue) crosses the valley in an east-west direction and State Highway 79 provides a north-south corridor for the region. The San Jacinto mountain range, to the east of the valley, is the dominant geographic feature of the region, rising to a height of 10,805 feet at Mount San Jacinto. Elevations on the valley floor range from approximately 1,400 to 1,800 feet. There are various bedrock outcrops in the area, none of which exceed 2,700 feet.
The San Jacinto Watershed (Figure 4.1) includes the Management Area and surrounding mountains and covers an area of approximately 728 square miles, measured above a point just downstream from Railroad Canyon Dam. All of the streams and rivers in the watershed are ephemeral, flowing only when precipitation occurs and losing much of this flow to groundwater infiltration. The San Jacinto River arises in and drains the western slopes of the San Jacinto Mountains. Waterways tributary to the river include the North and South Forks and Strawberry, Indian, Poppet, and Bautista Creeks. Lake Hemet, located in the mountains on the South Fork of the San Jacinto River, is a 12,775 AF capacity LHMWD-operated reservoir completed in 1895. The San Jacinto River recharges the groundwater basin, primarily in the area southeast of the City of San Jacinto. It then occasionally flows northwest past the Lakeview Mountains, filling Mystic Lake, before turning southwest to flow across the Perris Valley floor.
The San Jacinto River ultimately flows into Lake Elsinore via Railroad Canyon and Canyon Lake. Lake Elsinore, when full, overflows into Temescal Wash, which joins the Santa Ana River near Prado Dam.
41 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
!
! !
!
RAILROAD
CANYON
RESERVOIR
Hemet
Perris San Jacinto
Lake Elsinore
MATTHEWS
LAKE
ELSINORE
LAKE
PERRIS
LAKE SKINNER
LAKE
HEMET
October 2007
Hemet / San Jacinto Water Management Plan
San Jacinto Watershed
Figure 4.1
04 2
Miles
±
*Source: DWR, 2003
San Jacinto River
Potrero
Creek
Poppet
Creek
Indian
Creek
North Fork
San Jacinto
River
South Fork San Jacinto River
Strawberry
Creek
Salt Creek
Bautista Creek
2 1
3 4
5 6
7 8
9 10
11 1
2 3
4 5 6 7
9 8
10 11
12 13
13 12
Box Springs Mutual Water Company
Legend
San Jacinto Groundwater Basin*
Major Watercourses
Lakes and Reservoirs
! Cities
Management Area
Agency Boundary
City Of Hemet Water Dept.
City Of Perris Water Dept.
Elsinore Valley WD
Fern Valley WD
Idyllwild WD
Lake Hemet MWD
Nuevo Water Company
Pine Cove WD
Soboba Indian Reservation
Western Municipal WD
EMWD
San Jacinto Water Dept
14.B.
State of the Management Area
4.1.2 CLIMATE
The climate of the area is that of a dry, semi-arid, near-Mediterranean zone, typical of the moderately elevated inland valleys of southern California. The climate is characterized by wet and dry seasons, generally low precipitation, and a large proportion of clear days, moderately high summer temperatures, and mild winter temperatures. The yearly average temperature at the City of San Jacinto is 62°F (25°C). Summer temperatures are often more than 100°F (38°C), and the recorded maximum at San Jacinto is 120°F (49°C). Frost occasionally occurs during the December through February period. The lowest recorded temperature was 7°F (-14°C). The average frost-free period is 247 days long, from March 15 to November 19. These temperatures for the San Jacinto climate station are considered to be generally representative of temperatures throughout the valley area.
Along with the rest of Southern California, the area is subject to the annual Santa Ana winds.
Usually occurring in the fall of the year, these winds blow from the northeast, bringing hot, dry desert air with velocities of up to 50 miles per hour. Relative humidity has at times dropped below 5 percent with temperatures of 105°F (40°C) and higher. This phenomenon normally lasts only a few days, but has been known to last for several weeks, thereby greatly increasing the evaporation rate.
As a result of the hot, dry climate, the area has a high rate of evapotranspiration.
Evapotranspiration is recorded as reference evapotranspiration (ETo; evapotranspiration from a standardized grass surface) by the DWR’s California Irrigation Management Information System. Reference evapotranspiration averages 57 inches per year and is highly seasonal, with an average monthly maximum of 7.9 inches in July and average monthly minimum of 2.0 inches in December (DWR CIMIS, 2006).
Virtually all precipitation falls in the winter months, with some summer thunderstorms.
Topography generally controls the relative amounts of precipitation from one location to the next. The average precipitation on the valley floor is about 13 inches, but near Mt. San Jacinto, the average precipitation is approximately 40 inches. Figure 4.2 shows the distribution of precipitation in the watershed.
The Riverside County Flood Control and Water Conservation District (RCFC&WCD) currently maintains precipitation records from the National Weather Service precipitation gauge at the California Division of Forestry Station at 1st Street and San Jacinto Avenue in San Jacinto (Site #186). Annual San Jacinto precipitation totals for the 1850/51 through 2004/05 rain years (July – June) are shown in Figure 4.3. For the 155 years from July 1850 through June 2005, average precipitation equaled 13.12 inches; median precipitation was 12.13 inches; the year with 43 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
!
! !
!
Perris
Lake Elsinore
Hemet
San Jacinto
MATTHEWS
LAKE
ELSINORE
LAKE
PERRIS
LAKE SKINNER
LAKE
HEMET
!11
!15
!14
!18
!16
!13
!12
!20 !22 !24
!26 !28
!30 !32
!34 !36
!38
Legend
Equal Precipitation (in)*
Management Area
Lakes and Reservoirs
Major Watercourses
! Cities
October 2007
Hemet / San Jacinto Water Management Plan
Average Annual Precipitation
Figure 4.2
04 2
Miles
±
*Source DWR, 1978
(1932 - 1964 data)
San Jacinto River
14.B.
Figure 4.3 Annual Precipitation and Cumulative Departure from Mean Precipitation -30-20-10
0 1020304050
1850 1860 1870 1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 Date
Precipitation (inches)
-30-20-1001020304050
Cumulative Departure from Mean Precipitation (inches)
Annual Precipitation Mean Precipitation Cumulative Departure from Mean Precipitation Mean Precipitation = 13.1"
14.B.
State of the Management Area
the highest precipitation was 1883/84 with 35.77 inches of rain; and the driest year was 2001/02 with 3.85 inches. Figure 4.3 also shows the cumulative departure from mean precipitation. This chart represents wet periods with increasing values, such as 1882-1890 and 1990-1998; normal periods with near-constant values, such as 1859-1881 and 1980-1988; and dry periods as decreasing values, such as 1944-1976 and 1999-2004.
4.2 SURFACE WATER CONDITIONS
The San Jacinto River and its tributaries are the primary surface water elements in the Management Area. This river and its tributaries provide water for direct use, artificial recharge, as well as for significant natural recharge to the groundwater system through the riverbeds.
The San Jacinto River contains high quality water that flows from the mountain watershed and recharges groundwater. The river is a losing stream throughout the Management Area.
Artificial and natural recharge of San Jacinto River water improves the overall quality and quantity of groundwater. Groundwater levels have been lowered over the years to the point where additional changes in groundwater levels has little or no impact on surface flows or vice versa, although in predevelopment conditions groundwater contributed to surface flows in swampy areas of the basin floor, particularly upgradient of faults.
EMWD and RCFC&WCD have partnered with USGS to monitor stream flows. USGS gaging stations along the San Jacinto River and its tributaries in the Hemet/San Jacinto and surrounding area are listed in Table 4.1, below.
In 1996, EMWD entered into a Cooperative Water Program Joint Funding Agreement with the USGS for a long-term water budget study in the San Jacinto area. As part of this project, the USGS installed two stream flow gages and three stage gages in the San Jacinto Watershed.
The USGS applied a rainfall-runoff model to estimate the water budgets for groundwater and surface water flows and to determine the hydrological effects of urbanization. The study used historical precipitation data with the model to produce a simulated long-term record of groundwater recharge and surface water runoff for a variety of potential urbanized conditions.
The major objectives of the study were to:
1. Estimate groundwater recharge and surface water flows in the Canyon and Upper Pressure Management Zones;
2. Summarize the long-term water budget of the study area upstream of Mystic Lake; and
3. Determine the effects of urbanization in the study area. 46 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
Table 4.1 USGS Surface Water Gaging Stations
Station
No. Description: Lat.; Long.* Data Type Time Frame
11069200 Lake Hemet WC up Canyon near San
Jacinto
33°44'20";
116°49'30" Daily flows 1961-1991
11069300 WF San Jacinto Tributary near Valle Vista 33°43'20"; 116°48'00"
Peak flows
Daily flows
1962-1973
1961-1967
11069500 San Jacinto River near San Jacinto
(Cranston Ranger Station)
33°44'17";
11649'59"
Real time
Peak flows
Daily flows
Water Qual.
1921-present
1920-present
1998
11069501 San Jacinto River near San Jacinto plus
Canals
33°44'17";
116°49'59" Daily flows 1948-1990
11070000 Bautista Creek Near Hemet 33°41'40";
116°51'00"
Peak flows
Daily flows
1947-1969
1947-1969
11070020 Bautista Creek at head of Flood Channel in
Hemet
33°42'42";
116°52'04"
Peak flows
Daily flows
1988-2003
1987-present
11070050 Bautista Creek at Valle Vista 33°44'04";
116°53'33"
Peak flows
Daily flows
1970-1987
1969-1987
11070150 San Jacinto River above State Street near
San Jacinto
33°49'17";
116°58'21"
Peak flows
Daily flows
1997-present
1996-present
11070158 Line D Storm Drain at Santa Fe St. near
San Jacinto
33°46'44";
116°57'46" Peak flows 1997-1999
11070160 Line E Storm Drain at Santa Fe St. near San
Jacinto
33°46'41':
116°58'18" Peak flows 1997-1999
11070185 Lamb Canyon at Victory Ranch near San
Jacinto
33°51'31";
117°00'53" Peak flows 1997-2004
11070190 Laborde Canyon near San Jacinto 33°51'44";
117°01'29" Peak flows 1962-1973
11070210 San Jacinto River at Ramona Expressway
near Lakeview
33°50'23";
117°08'06"
Real time
Peak flows
Daily flows
2001-present
2000-present
* The longitude and latitude measurements are published figures, but were estimated by the USGS from maps and, therefore, only have an accuracy of +/- 500 feet.
Five gages were installed upstream of Bridge Street in the San Jacinto basin area. Two stream flow gages were installed in the San Jacinto River, one at the State Street (Highway 79) crossing and the other at the Cranston Ranger Station. Three crest stage gages were installed in Potrero Canyon near San Jacinto, Lamb Canyon near San Jacinto, and at an urban runoff site.
Groundwater recharge in the Canyon and Upper Pressure Management Zones was calculated in addition to the surface runoff leaving the Management Area (including urban runoff) that reaches the Mystic Lake area. The study results are summarized in the USGS Water Resources Investigations Report 02-4090, Rainfall-Runoff Characteristics and Effects of Increased Urban Density on Streamflow and Infiltration in the Eastern Part of the San Jacinto River Basin, Riverside County, 47 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
California. The report includes all measured, simulated, and statistical data used to support the conclusions of the study.
After the end of the study, some of the crest stage gages were no longer monitored and fell into disrepair. However, EMWD continues to fund, and USGS continues to operate, the stream gage on the San Jacinto River at State Street. The crest stage gage at Lamb Canyon Creek at Victory Ranch is still jointly funded by EMWD and USGS. For the 2005/2006 monitoring, the effort was funded as part of the Hemet/San Jacinto Monitoring Program by EMWD, LHMWD, and the Cities of Hemet and San Jacinto. The stream gage on the San Jacinto River at Cranston Ranger Station is currently funded and maintained by USGS and Riverside County Flood Control District with real-time data available on the USGS website.
4.3 GEOLOGY
The geology of the Hemet/San Jacinto area, relevant to groundwater supplies, has two primary features: a sediment filled graben, and the San Jacinto fault zone. The sediments in the graben provide for the majority of storage and movement of groundwater in the area and the movement of water is altered by the presence of the faults, which provide most of the internal boundaries for the area’s Management Zones.
The Management Area partially contains a geomorphic feature known as a graben or faultgraben, along with additional permeable materials in alluvium-filled valleys. A graben is a depressed, trough-like structure in the Earth's crust, filled or partially filled with sediments, and usually formed by faulting and the relative downward movement of block-like geologic structures. The San Jacinto graben is a deep, sediment-filled structure approximately 2.5 miles wide and more than 20 miles long and forms the Upper Pressure Management Zone’s boundaries in the Management Area. The Management Area, including the graben, is nearly surrounded by impermeable bedrock mountains and hills. Internally, island-like masses of granite and metamorphic bedrock or older alluvium rise above the valley floor. Surface and near-surface sediments in the graben and alluvium filled valleys are primarily sand and sandy silt with some silt and silty clay. The San Jacinto graben consists of a forebay area in the southeast where surface water recharge primarily occurs and a pressure area in the northwest where deep aquifers exist under confined conditions. The northwest-southeast oriented graben is formed by the right-slipping San Jacinto fault zone, believed to be the most seismically active in southern California. Between 1899 and the present, seven earthquakes of Richter magnitude
6.0 or greater have occurred along the San Jacinto fault between the San Gabriel Mountains and Mexico. This complex zone of faulting and cross faulting has two main branches, the Claremont and the Casa Loma, which form the northeast and southwest borders of the graben, respectively (see Figure 4.4).
48 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
!
!
San Jacinto River
Diamond Valley Lake
Claremont Fault
Casa Loma Fault
Park Hill Fault
Bautista Creek Fault
S A N J A C I N T O F A U L T Z O N E
Lake Skinner
Hemet
San Jacinto
·|}þ79
·243 |}þ
·|}þ74
·|}þ79
Legend
Faults*
! Cities
Major Watercourses
Lakes and Reservoirs
Major Roads
Management Area
October 2007
Hemet / San Jacinto Water Management Plan
Fault Locations
Figure 4.4
01 0.5
Miles
±
*Source: Riverside County Page 1241 of 1949
14.B.
State of the Management Area
The Claremont fault separates the graben from the Badlands and the San Jacinto Mountains on the northeast. This fault follows Gilman Springs Road from State Highway 60 to the City of San Jacinto, hugging the foothills. It then follows the San Jacinto River before shifting to Bautista Creek south of Valle Vista. To the west, the Casa Loma fault generally parallels the Claremont Fault. The Casa Loma portion of the San Jacinto fault zone forms the southwesterly border of the graben. It runs from Park Hill (also known as Casa Loma) to the northwest toward Reche Canyon. The Bautista Creek fault is an extension of the Casa Loma fault, but is separately named due to differences in fault movement (DWR, 1969). The Bautista Creek fault runs from Bautista Canyon through the intersection of Menlo and San Jacinto Streets, joining the Casa Loma fault on the western side of Park Hill.
The portions of the Management Area outside the graben, to the east of the Claremont Fault and to the west of the Casa Loma and Bautista Creek faults, are sediment filled basins. These sediments are similar in nature to those in the graben, but are much thinner.
The faulting in the Management Area plays an important role in the movement of groundwater and is therefore a key factor in the delineation of Management Zones.
4.4 DELINEATION OF MANAGEMENT ZONES
Groundwater Management Zones (Figure 2.1) were delineated by the RWQCB based on major impermeable boundaries (such as bedrock or faults), flow systems that prevent widespread mixing even without a physical barrier, and water quality. Groundwater flow, whether or not determined by a physical barrier, was the primary characteristic used to define the Management Zones. Water quality data were used to support understanding of the flow regime and to assure that unusually high quality or poor quality waters were distinguished for regulatory purposes. (RWQCB, Resolution No. R8-2004-0001).
The four Management Zones within the Hemet/San Jacinto Management Area are:
1. Canyon;
2. San Jacinto Upper Pressure (Upper Pressure);
3. The Hemet North portion of Lakeview/Hemet North (Hemet North); and
4. Hemet South.
The Canyon Management Zone lies along a northwest to southeast axis in the eastern part of the Management Area. The boundaries of the Canyon Management Zone include the virtually impermeable San Jacinto Mountains to the east and Claremont Fault to the west. The Claremont Fault inhibits flow between Canyon and Upper Pressure Management Zones (DWR, 1969; DWR, 1978; SWRB, 1955).
50 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
Like the Canyon Management Zone, the Upper Pressure Management Zone lies along a northwest to southeast axis in the eastern part of the Management Area. The Upper Pressure Management Zone is bounded by the Claremont Fault to the northeast, the Casa Loma and Bautista Creek Faults to the southwest, and the flow system boundary with the San Jacinto Lower Pressure Management Zone to the northwest.
Boundaries of the Hemet North Management Zone include the Casa Loma Fault to the east; the groundwater divide near Esplanade Avenue to the south; the impermeable bedrock of the Lakeview Mountains to the west; and a constricted area of permeable materials between the Lakeview Mountains and the Casa Loma Fault to the northwest. The Casa Loma fault zone is a known barrier to groundwater flow (DWR, 1969; DWR, 1978; SWRB, 1955).
The Hemet South Management Zone boundaries include the Casa Loma and Bautista Creek faults to the east; the groundwater divide near Esplanade Avenue to the north; the groundwater divide in the Winchester area and various crystalline bedrock outcrops to the west. Diamond Valley Lake, a water supply reservoir for the MWD completed in 1999 and filled by 2002, is located southwest of the Hemet South Management Zone. MWD (1991) states that seepage through the permeable materials in the upper 200 feet may take place. The Casa Loma and Bautista Creek faults are known barriers to groundwater (DWR, 1969; DWR, 1978; SWRB, 1955).
For the Management Area as a whole, the mountains (Figure 4.1) form a nearly impermeable boundary such that there are only three pathways for groundwater to migrate to or from other Management Zones outside the Management Area. These locations are:
Between the Hemet South and Perris South Management Zones, in the southwest;
Between the Hemet North portion and Lakeview portion of Lakeview/Hemet North Management Zones, in the northwest; and
Between the Upper Pressure and Lower Pressure Management Zones, in the northwest.
Groundwater flow in and out of the Management Area is important, as water quality is typically better in the Management Area than in the surrounding areas.
4.5 SOILS
The influence of soils on water use and hydrologic processes makes it an important component to consider when estimating changes in water use due to land use change as well as for siting spreading basins for artificial recharge projects.
51 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
The predominant soils, as defined in the USDA’s soil survey (USDA, 1971) at the series level, in the Management Area are shown in Figure 4.5 and are listed below:
Dello,
Grangeville,
Greenfield,
Metz,
San Emigdio, and
Traver.
The remaining soils are classified as “Other” in Figure 4.5 and consist of Chino, Domino, Exeter, Hanford, Pachappa, Ramona, Riverwash, as well as other soil series occurring in less than one square mile of the Management Area.
An important soil classification used by the USDA for hydrology is the hydrologic soils group.
The hydrologic soils group can be used to estimate the amount of infiltration that can be expected from a certain soil. This grouping is based on estimates of the intake of water during the latter part of a storm of long duration, after the soil profile is wet and has an opportunity to swell, without the protective effect of any vegetation. Also considered are depths to the seasonal high water table and to a low permeability layer. The classification is useful at a planning level, but detailed studies are required for a thorough understanding of the infiltration capacity of soils. Features such as slope, ground cover, or low permeability materials away from the upper soil profile may impact the soil’s capability to infiltrate water.
Under the hydrologic soils group classification system, soils are grouped A to D with “A” having the lowest runoff potential (highest infiltration rates) and “D” having the highest runoff potential (lowest infiltration rates). A map of hydrologic soils groups is provided as Figure 4.6 (USDA-SCS, 1971) and a corresponding table of hydrologic soil groups and soil series is provided in Table 4.2. As can be seen on Figure 4.6, most of the Management Area is classified as “B”, soils with a moderate infiltration rate. Of the Management area, nearly 80% are “B” soils, 10% are “A” soils, and the remainder are either “C”, “D”, or are deemed too variable to be classified. The “A” soils are generally located along the San Jacinto River and Bautista Creek; much of the “variable” soils along these watercourses also have the potential for very high infiltration rates.
52 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
!
!
San Jacinto River
Diamond Valley Lake
Lake Skinner
Hemet
San Jacinto
·|}þ79
·243 |}þ
·|}þ74
·|}þ79
Legend
Soil Series*
Dello
Grangeville
Greenfield
Metz
San Emigdio
Traver
Other
! Cities
Major Watercourses
Lakes and Reservoirs
Major Roads
Management Area
October 2007
Hemet / San Jacinto Water Management Plan
Soil Series
Figure 4.5
01 0.5
Miles
±
*Source: USDA, 1971 Page 1245 of 1949
14.B.
!
!
San Jacinto River
Diamond Valley Lake
Lake Skinner
Hemet
San Jacinto
·|}þ79
·243 |}þ
·|}þ74
·|}þ79
Legend
Hydrologic Soils Group*
Group A - High Infiltration Rate
Group B - Moderate Inflitration Rate
Group C - Slow Infiltration Rate
Group D - Very Slow Infiltration Rate
Variable
! Cities
Major Watercourses
Lakes and Reservoirs
Major Roads
Management Area
October 2007
Hemet / San Jacinto Water Management Plan
Hydrologic Soils Groups
Figure 4.6
01 0.5
Miles
±
*Source: USDA, 1971 Page 1246 of 1949
14.B.
State of the Management Area
Table 4.2 Hydrologic Soils Groups
Common Soil Series Hydrologic Soils
Group Minor Soil Series Hydrologic Soils Group
Dello A-C Chino B-C
Grangeville B-C Domino C
Greenfield B Exeter C
Metz A Hanford B
San Emigdio B Pachappa B
Traver B-C Ramona B-C
Riverwash variable
Other variable
4.6 GROUNDWATER CONDITIONS
As previously stated, groundwater flow between Management Zones is inhibited by geologic faults, (Figure 4.4) notably the Casa Loma Fault, Bautista Creek Fault and Claremont Fault, all strands of the San Jacinto fault zone. The Claremont Fault acts as a barrier to flow between Canyon and Upper Pressure Management Zones, while the Casa Loma Fault is a barrier to flow between the Upper Pressure Management Zone and both the Hemet North and Hemet South Management Zones.
The San Jacinto River enters the basin in the southeast part of the Management Area and flows north and west across the Upper Pressure Management Zone. In most years, all river flow is lost to percolation and limited evapotranspiration in the Canyon and Upper Pressure Management Zones. Recharge from the San Jacinto River and its tributaries forms a large portion of total inflow for the Canyon and Upper Pressure Management Zones.
Groundwater pumping for irrigation and domestic purposes is the principal source of groundwater outflow. Major pumping depressions occur in the Hemet South and Upper Pressure Management Zones.
Historically, extraction in excess of recharge has resulted in lowered groundwater levels and altered directions of groundwater flow.
4.6.1 ARTIFICIAL RECHARGE OPERATIONS
In addition to natural inflows and return flows from agricultural and municipal uses, there has been and continues to be artificial recharge operations in the Management Area. These 55 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
operations use imported water, when available, typically at lower winter rates, to artificially recharge groundwater through spreading basins. The annual volume of imported water recharged is presented in Figure 4.7. Recharge operations did not begin until 1990. More recently, the Public Agencies have signed memoranda of understanding in 2004 and 2005 to plan for the recharge at two existing recharge facilities in the San Jacinto riverbed. 0 3000
6000
9000
19841986198819901992199419961998200020022004
Year
Imported Water Recharged
(AFY)
Figure 4.7 Annual Imported Water Recharged
The artificial recharge operations help address the impact of overdraft caused by past groundwater production.
4.6.2 GROUNDWATER LEVELS AND FLOW
Historical groundwater extraction from the Management Area has resulted in a significant drop in groundwater levels. The lowered groundwater levels also changed the direction of flow in parts of the Management Area. Figure 4.8 shows the flow directions in the early 20th Century.
Figure 4.9 shows current flow directions. Notable changes over time include the development of a groundwater divide between the Hemet South and Perris South Management Zones (previously flow was out of the Hemet South Management Zone into the Perris South Management Zone and flow from the Hemet North portion to the Lakeview portion of the Lakeview/Hemet North Management Zone due to lower water levels in the Lakeview portion. (TechLink, 2002a)
56 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
!
!
San Jacinto River
Diamond Valley Lake
Claremont Fau
Casa Loma Fault
lt
Park Hill Fault
Bautista Creek Fault
Lake Skinner
Hemet
San Jacinto
·|}þ79
·243 |}þ
·|}þ74
·|}þ79
Legend
Faults*
! Cities
Major Watercourses
Lakes and Reservoirs
Major Roads
Management Area
October 2007
Hemet / San Jacinto Water Management Plan
Early 20th Century Groundwater Flow Direction
Figure 4.8
01 0.5
Miles
±
*Source: Riverside County
Generalized Groundwater Flow Direction
based on Techlink, 2002 & EMWD, 2005
14.B.
!
!
San Jacinto River
Diamond Valley Lake
Claremont Fault
Casa Loma Fault
Park Hill Fault
Bautista Creek Fault
Lake Skinner
Hemet
San Jacinto
·|}þ79
·243 |}þ
·|}þ74
·|}þ79
Legend
Faults*
! Cities
Major Watercourses
Lakes and Reservoirs
Major Roads
Management Area
October 2007
Hemet / San Jacinto Water Management Plan
Current Groundwater Flow Direction
Figure 4.9
01 0.5
Miles
±
*Source: Riverside County
Generalized Groundwater Flow Direction
based on Techlink, 2002 & EMWD, 2005
14.B.
State of the Management Area
Figure 4.10 shows Spring 2004 groundwater levels. The groundwater level contours show pumping depressions in the northeastern part of the Hemet South Management Zone and in the northwestern part of the Upper Pressure Management Zone. These pumping depressions are due to concentrated pumping in those areas in excess of the local recharge capacity.
Historical groundwater levels are affected by both climatic conditions, which impact the amount of recharge, and pumping. Historical conditions in the four Management Zones can be studied in relation to their unique setting by analyzing observed water levels at representative wells with long periods of record. Hydrographs for four selected wells are presented in the following sections. The locations of the wells can be found on Figure 4.11.
4.6.2.1 Canyon Management Zone
The Canyon Management Zone benefits from significant surface water recharge from the San Jacinto River and its tributaries. This additional recharge reduces the impact of the pumping occurring in the Canyon Management Zone. Figure 4.12 shows groundwater levels from 1948 to 2005 for EMWD’s #6 Cienega well. This figure shows the impact of hydrologic variability and pumping in the area. One drought period in the late 1980s resulted in groundwater levels dropping by over 100 feet. Such declines in groundwater levels are likely due to a combination of reduced precipitation, reduced recharge from streamflow, and the effects of pumping. Most of this decline was recovered in the wet period that followed from 1991 to 1993.
Changes are also seen seasonally, with groundwater levels changing by as much as 100 feet from late fall to late spring. These seasonal changes in water levels are also due to a combination of reduced precipitation, reduced recharge from streamflow, and the effects of pumping.
4.6.2.2 Upper Pressure Management Zone
The Upper Pressure Management Zone benefits from surface water recharge from the San Jacinto River and its tributaries and supplies most of the groundwater for the Management Area. However, even with significant recharge from surface water as well as other inflows, wells in the Upper Pressure Management Zone have shown a decline in water levels over time.
Figure 4.13 presents water level elevations for EMWD’s #9 Hewitt and Evans well, showing a consistent decline through the dry period of the 1950s, 1960s, and 1970s with a drop of more than 200 feet over the 30-year period. The hydrologically wet and normal periods during 1978 to 1986 resulted in a recovery of about half the decline from the previous three decades. Since 1986, groundwater levels have dropped approximately 200 feet. The changes seen in the well 59 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
!
!
San Jacinto River
Diamond Valley Lake
Lake Skinner
Hemet
San Jacinto
·|}þ79
·243 |}þ
·|}þ74
·|}þ79
1340
1360
1420
1380
1540
1300
1400
1520
1660
1260
1220
1500
1280
1200
1640
1560
1180
1380
1420
1240
1200
1340
1280
1220
1160
1180
1320
1360
1420
1640
1500
1300
1800
1440
1260
1840
1700
1760
1340
1320
1280
1280
1240
Legend
Faults*
Groundwater Level Contours (ft)**
! Cities
Major Watercourses
Lakes and Reservoirs
Major Roads
Management Area
October 2007
Hemet / San Jacinto Water Management Plan
Spring 2004 Groundwater Elevation
Figure 4.10
01 0.5
Miles
±
*Source: Riverside County
**Source: EMWD, 2005
*Groundwater Contours Intervals are not consistent due to steep gradients in mountainous areas and shallow gradients in valley areas and/or limited data.
14.B.
!
!
>
>
>
>
San Jacinto River
Diamond Valley Lake
Lake Skinner
EMWD 22 Sneed
EMWD 06 Cienega
EMWD 21 Old Dairyland
EMWD 09
Hewitt & Evans
Hemet
San Jacinto
·|}þ79
·243 |}þ
·|}þ74
·|}þ79
Legend
> Wells Featured in Hydrographs*
! Cities
Major Watercourses
Lakes and Reservoirs
Major Roads
Management Area
October 2007
Hemet / San Jacinto Water Management Plan
Location of Representative Well Hydrographs
Figure 4.11
01 0.5
Miles
±
*Source: EMWD
14.B.
Figure
4.12 Groundwater Elevation
Canyon Management Zone, EMWD #6 Cienega
130013501400145015001550160016501700
1948
1950
1952
1954
1956
1958
1960
1962
1964
1966
1968
1970
1972
1974
1976
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
2000
2002
2004
Date
Groundwater Elevation (ft amsl)
14.B.
Figure
4.13 Groundwater Elevation
Upper Pressure Management Zone, EMWD #9 Hewitt and Evans 115012001250130013501400145015001550
1948
1950
1952
1954
1956
1958
1960
1962
1964
1966
1968
1970
1972
1974
1976
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
2000
2002
2004
Date
Groundwater Elevation (ft amsl)
14.B.
State of the Management Area
are likely due to a combination of reduced precipitation, reduced recharge from streamflow, and effects of pumping.
4.6.2.3 Hemet North Portion of the Lakeview/Hemet North Management Zone Groundwater levels in Hemet North portion of the Lakeview/Hemet North Management Zone have shown a steady decline followed by recent stabilization. These declines occur even though significantly less water was pumped from the Hemet North portion than from other Management Zones. The Hemet North portion does not receive as much surface water recharge as Upper Pressure and Canyon Management Zones, thus impacts of pumping are more pronounced than they might be in those Management Zones. Figure 4.14 shows groundwater levels at EMWD’s #21 Old Dairyland well. Since the beginning of the record in 1966, groundwater levels have steadily declined, with little variability. After dropping more than 100 feet from the mid-1960s to the mid-1990s, groundwater levels have stabilized at an average of 1,250 feet above mean sea level.
4.6.2.4 Hemet South Management Zone
Groundwater levels in the Hemet South Management Zone have shown a steady decline, although the recent rate of decline has slowed. Figure 4.15 shows groundwater levels at EMWD’s #22 Sneed well since the beginning of the record in 1952. While data is limited for the 1952 to 1990 period, groundwater levels declined through the 1952-1990 period, and the increased data available from 1990 to 2005 shows little variability. Groundwater level declines have slowed but have still dropped approximately 20 feet in the past 10 years.
4.6.3 GROUNDWATER BUDGET
The changes in groundwater levels and flow directions are the result of changes in the balance of inflows and outflows from the Management Area. A groundwater budget can identify potential causes of an imbalance. The groundwater budget presented in Table 4.3 shows average annual values for the components of total inflow and total outflow. The values are based on a water balance spreadsheet tool developed for use by the TC. This Excel-based tool allowed the TC members to investigate the impact of inclusion and exclusion of specific water budget components, such as artificial recharge, imported water, and others, as well as the implications of different data sources, such as the calibrated groundwater model and the database or reported values with underflow estimates. This allowed for a more thorough understanding of the potential impacts of definitions of water budget components on the calculated yield and overdraft. The values presented in Table 4.3, as agreed upon by the TC, are the results of the calibrated groundwater model except for groundwater extraction, which is 64 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Figure
4.14 Groundwater Elevation
Hemet North Management Zone, EMWD #21 Old Dairyland
100010501100115012001250130013501400
1948
1950
1952
1954
1956
1958
1960
1962
1964
1966
1968
1970
1972
1974
1976
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
2000
2002
2004
Date
Groundwater Elevation (ft amsl)
14.B.
Figure
4.15 Groundwater Elevation
Hemet South Management Zone, EMWD #22 Sneed
110011501200125013001350140014501500
1948
1950
1952
1954
1956
1958
1960
1962
1964
1966
1968
1970
1972
1974
1976
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
2000
2002
2004
Date
Groundwater Elevation (ft amsl)
14.B.
State of the Management Area
obtained from the data tabulated in Assessment of Historical and Projected Land and Water Use Data (WRIME, 2003a).
Table 4.3 Groundwater Budget for the Management Area
(Average Annual Volume for Water Years 1984-2004*)
Inflow Component Volume
(AFY) Outflow Component Volume (AFY)
Recharge from Rainfall 8,900 Groundwater Production 57,800 San Jacinto River and Bautista
Creek Recharge 9,900 Subsurface Outflow from Hemet South to Perris South 300 Recharge from Public Agency
Sales 2,900 Subsurface Outflow from
Hemet North to Lakeview 1,500
Recharge from Irrigation 9,600
Conjunctive Use Recharge 800
Reclaimed Water Recharge 1,500
Subsurface Inflow from
Mountain Fronts 8,000
Subsurface Inflow from Lower
Pressure to Upper Pressure 1,700
Total 43,300 Total 59,600
* Values for Groundwater Production represent 1984-2004 averages, an update from the 1984-2003 values presented in WRIME, 2003a. All other data is taken from the 1984-1999 modeling results (TechLink, 2002a).
The total average annual inflow is 43,300 AFY and the total average annual outflow is 59,600 AFY, resulting in an average annual deficit of 16,300 AFY for the 20-year hydrologic period of 1984 to 2004. Nearly all (97%) outflow is from groundwater extraction while inflow is primarily natural recharge, representing 66% of inflow and the remainder a direct result of recharge from applied water or other human activities. The 1984-2004 hydrologic period presented in Table 4.3 represents the period during which the most consistent and continuous data for the Management Area is available. It should be noted, however, that this period does not necessarily represent the long-term groundwater basin conditions, and as described in Section 4.9 of this document, long-term overdraft is estimated based on longer periods, as well as other methods and criteria.
4.6.4 LAND SUBSIDENCE
In additional to water quantity and quality concerns, there is the potential for further land subsidence in the Management Area, although not at rates to cause significant damage. 67 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
Widespread land subsidence has been observed in the San Jacinto basin as the area and its groundwater resources have been developed. Three forms of subsidence have been reported by the U.S. Environmental Protection Agency (Boen, et al., 1971): local or regional tectonic adjustments along the faults in the area; groundwater withdrawals and subsequent artesian head decline; and soil collapse or compaction due to causes other than tectonic or artesian head decline. In the graben, tectonic subsidence has averaged 0.2 in/yr (4.5 mm/year) over the past 40,000 years and subsidence due to groundwater withdrawal and aquifer compaction is 1 - 1.2 in/yr (2.5 - 3 cm/yr) (Morton, 1995). Lofgren (1975, 1976) reported in studies that, through the years, the periods of subsidence tend to correspond to the periods of groundwater production; land surface elevation at the well tends to be lower each year; and subsidence has been greater within the graben than on either side.
4.7 LAND USE
Land use in the Management Area has experienced changes over the past half-century. The conversion from agricultural or undeveloped lands to urban uses has an impact on basin hydrogeology as well as on water demand. Figure 4.16 and Table 4.4 show land uses in 1998 for most of the project area.
Table 4.4 Land Use Distribution Based on the 1998 Survey Land Use Canyon Upper
Pressure
Hemet
South
Hemet
North Total
Total Area (acres) 4,400 21,200 25,300 5,600 56,500
% Urban and Suburban 24% 24% 36% 11% 28%
% Irrigated Crops and Recreational 12% 49% 15% 47% 31%
% Non-Irrigated Crops and Native
Vegetation 16% 24% 45% 42% 35%
% Unmapped 48% 3% 4% 0% 7%
Much of the urban uses in the area are recent. This is shown by the significant population growth in the area, as highlighted Figure 4.17, which displays population data from the decennial US Census reports and a 2004 US Census estimate for the incorporated areas of Hemet and San Jacinto.
68 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
!
!
San Jacinto River
Diamond Valley Lake
Hemet
San Jacinto
·|}þ79
·243 |}þ
·|}þ74
·|}þ79
Legend
Land Use*
Urban
Irrigated Agriculture
Native Vegitation
Water
! Cities
Major Roads
Management Area
October 2007
Hemet / San Jacinto Water Management Plan
1998 Land Use
Figure 4.16
01 0.5
Miles
±
*Urban includes: Commercial, Residential, Industrial,
Homes/Trailer Parks, Public Infrastructure, and Public Institutions.
Irrigated Agriculture includes: Dairy/Livestock,
Irrigated Cropland, Orchards & Vineyards, and Recreation.
Native Vegetation includes: Non-irrigated Cropland,
Open Space, Other Agriculture/Ranches, and Vacant
Source: EMWD
14.B.
State of the Management Area
0 10,000
20,000
30,000
40,000
50,000
60,000
70,000
19101920193019401950196019701980199020002004
Year
Population
Hemet San Jacinto
Figure 4.17 Population Growth in Incorporated Hemet and San Jacinto From 1950 to 2004, the population in Hemet increased twenty-fold and the population in San Jacinto increased sixteen-fold. Such urbanization results in changes in both water demand and hydrologic processes. For newly urbanized areas that were previously non-irrigated, water demands obviously increase significantly. Areas that change from irrigated agricultural uses to urban uses do not typically see major changes in the total annual water demand. However, water demand from urban users is typically less elastic than water demand from agricultural users, making drought contingencies more important. The requirements for water quality are also typically more stringent for urban users. From a hydrologic perspective, urbanization results in an increase in the impervious land area, e.g., more pavement and buildings, with the resulting increased runoff and decreased infiltration. Additionally, the water used indoors by urban users is sent to treatment plants, shifting the potential for recharge of this water from the area of use to the treatment plant area.
The urbanization trend is not unique to the Management Area, but has been pervasive throughout the fringes of urbanized Southern California. While the rate of urbanization may change in the future, the trend of urbanization is likely to continue and to play a significant role in land use and water demand. Further discussion of future land use changes may be found in Section 5.
70 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
4.8 CURRENT WATER SUPPLIES
There are four Public Agencies primarily responsible for water supply in the Management Area:
EMWD, LHMWD, and Cities of Hemet and San Jacinto. In addition, Private Water Producers produce groundwater and purchase water from the Public Agencies, and the Soboba Tribe pumps groundwater for its respective uses. Each entity pumps groundwater, and some entities also utilize a mix of some of the following sources: surface water diversions, surface water and/or groundwater purchases, surface water imports, and recycled water. The water supply conditions in the Management Area and the interrelationships among the various agencies is a primary factor for future water management in the area. Figure 4.18 shows these interrelationships in a diagram form.
Figure 4.19 shows the makeup of the water supply and how this mix has changed from 1985 to 2004 for the Management Area. Groundwater is the predominant source of water supplies for the Management Area. The remaining sources are smaller, but still important, sources of water.
Supplies listed by entity are provided in Appendix F. Note that items such as sales to other agencies are not subtracted in these supply values, resulting in a supply that represents both wholesale and retail supplies. As a result of this definition, supplies will not equal the historical demand. Historical demand for the individual entities is shown in Figures 4.20 – 4.25.
4.8.1 GROUNDWATER
All entities pump groundwater for all or a portion of their water supply. The quantity of groundwater extraction for each Management Zone is shown in Figures 4.26a, 26b, and 4.27. 71 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
NATURAL SYSTEM SURFACE WATER DIVERSION AND GROUNDWATER PRODUCTION SYSTEM Water Balance OutflowsWater Balance Inflows
Figure 4.18 Components of Hemet/San Jacinto Groundwater Balance Irrigation Demand
M&I Demand
Outdoor Use Indoor Use
Wastewater
Treatment Plant
Groundwater
Production
Groundwater
Production
Precipitation
San Jacinto
River and
Bautista Creek
Recharge
Recharge from
Irrigation
Recharge from
Agency Sales
Hemet/San Jacinto Groundwater Basin
Surface Water Imports
Outfall
Recharge from
Rainfall
Out of Basin Flows
San Jacinto River
and Tributary
Streams
SubsurfaceOutflow Subsurface
Inflow
Out of
Basin
Use
Conjunctive
Use
Recharge
Surface Water
Diversions
Recycled Water Use
Reclaimed
Water
Recharge
Recharge
from
Artificial
Recharge
Agency Sales
Ag Use M&I Use
Artifical
Recharge
Recycled Water
Storage
Artifical
Recharge
14.B.
State of the Management Area
0 10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
19841986198819901992199419961998200020022004
Year
Demand (AFY)
Groundwater Surface Water Recycled Imports
Figure 4.19 Annual Management Area Water Supplies
0 2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
20,000
19841986198819901992199419961998200020022004
Year
Demand (AFY)
Figure 4.20 EMWD Historical Annual Demand
73 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
0 2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
20,000
19841986198819901992199419961998200020022004
Year
Demand (AFY)
insufficient data
Figure 4.21 LHMWD Historical Annual Demand
0 1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
19841986198819901992199419961998200020022004
Year
Demand (AFY)
Figure 4.22 City of Hemet Water Service Area Historical Annual Demand 74 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
0 1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
19841986198819901992199419961998200020022004
Year
Demand (AFY)
Figure 4.23 City of San Jacinto Water Service Area Historical Annual Demand 0 5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
19841986198819901992199419961998200020022004
Year
Demand (AFY)
Figure 4.24 Private Water Producers Historical Annual Demand 75 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
0 1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
19841986198819901992199419961998200020022004
Year
Demand (AFY)
Figure 4.25 Soboba Historical Annual Demand
0 10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
19841986198819901992199419961998200020022004
Year
Production (AFY)
Canyon Hemet North Hemet South Upper Pressure
Figure 4.26a Annual Groundwater Production, by Management Zone 76 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
0 10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
19841986198819901992199419961998200020022004
Year
Production (AFY)
EMWD LHMWD Hemet San Jacinto Private Water Producers Soboba Tribe Figure 4.26b Annual Groundwater Production, by Entity
0 5,000
10,000
15,000
20,000
25,000
30,000
EMWD LHMWD Hemet San Jacinto Private
Pumpers
Soboba
Tribe
Entity
Average Production (AFY)
Canyon Hemet North Hemet South Upper Pressure
Figure 4.27 Average Annual Entity Groundwater Production, by Management Zone, 1984-2004
Since 1984, each entity except for the City of San Jacinto has pumped groundwater from multiple Management Zones. San Jacinto’s pumping during that time period has always been from the Upper Pressure Management Zones. The percentage of the water supply from groundwater for each remaining entity, compared to other components of the water supply, is shown in Figures 4.28a-e as a pie chart breaking down the entity’s 2004 groundwater supply by 77 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
Management Zone. Additionally, Figure 4.29a-e presents stacked area charts showing the historical annual percentage of groundwater supply from each Management Zone. 13%
70%
17% Canyon
Hemet North
Hemet South
Upper Pressure
Figure 4.28a EMWD 2004 Groundwater
Production, Percentage by Supply Source
17%
83%
Canyon
Hemet North
Hemet South
Upper Pressure
Figure 4.28c City of Hemet Water Service Area
2004 Groundwater Production, Percentage by
Supply Source
61%
33%
6%
Canyon
Hemet North
Hemet South
Upper Pressure
Figure 4.28b LHMWD 2004 Groundwater
Production, Percentage by Supply Source
100%
Canyon
Hemet North
Hemet South
Upper Pressure
Figure 4.28d Soboba 2004 Groundwater
Production, Percentage by Supply Source
3%
61% 20%
16% Canyon
Hemet North
Hemet South
Upper Pressure
Figure 4.28e Private Water Producers 2004
Groundwater Production, Percentage by Supply
Source
78 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
0%
20%
40%
60%
80%
100%
19841985
198619871988
1989
199019911992
199319941995
199619971998
1999
200020012002
20032004
Canyon Hemet North Hemet South Upper Pressure
Figure 4.29a EMWD Historical Groundwater Production, Percentage by Supply Source
0%
20%
40%
60%
80%
100%
19841985
19861987
19881989199019911992
19931994
1995
1996
1997
1998
1999
2000
20012002
2003
2004
Canyon Hemet North Hemet South Upper Pressure
Figure 4.29b LHMWD Historical Groundwater Production, Percentage by Supply Source
0%
20%
40%
60%
80%
100%
19841985
1986
1987
198819891990
1991
1992
199319941995
1996
1997
1998
19992000
20012002
20032004
Canyon Hemet North Hemet South Upper Pressure
Figure 4.29c City of Hemet Water Service Area Historical Groundwater Production, Percentage by Supply Source
79 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
0%
20%
40%
60%
80%
100%
19841985
19861987
198819891990
1991
1992
19931994
1995
19961997
1998
19992000
20012002
2003
2004
Canyon Hemet North Hemet South Upper Pressure
Figure 4.29d Soboba Historical Groundwater Production, Percentage by Supply Source
0%
20%
40%
60%
80%
100%
19841985
19861987
1988
1989
1990
1991
1992
199319941995
1996
1997
1998
19992000
20012002
20032004
Canyon Hemet North Hemet South Upper Pressure
Figure 4.29e Private Water Producers Historical Groundwater Production, Percentage by Supply Source
The pie charts show that in 2004 the Upper Pressure Management Zone provided the majority of groundwater for four of the six entities. The Hemet South Management Zone provided the majority of water to the City of Hemet Water Services Area and The Canyon Management Zone provided all groundwater for the Soboba Tribe.
The only significant trend seen in the 1984 - 2004 historical annual charts is LHMWD’s shift in groundwater sources from majority Canyon Management Zone water in the mid-1980s to mostly Upper Pressure Management Zone water recently. These charts also emphasis the importance of the Upper Pressure Management Zone, as it was a component of the groundwater supply for all entities over the 1984 – 2004 time period.
4.8.2 IMPORTED WATER
EMWD is a member agency of the MWD, and, as such, is able to import water from Northern California via the State Water Project and from the Colorado River Aqueduct. Imported water is used for supply as well as for groundwater recharge; this section only discusses imported 80 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
water for supply, imported water for recharge is discussed in Section 4.6.1. District-wide, imported water comprises 80% of EMWD’s total potable water supply. However, imported water is a small portion of EMWD’s water supply in the Management Area due to the availability of high quality groundwater, which is less common in the rest of the EMWD service area. Over the 1984-2004 period, imported water represented 13% of EMWD’s supply and 2% of the total Management Area supply (WRIME, 2003a). In 2004, imported water represented 41% of EMWD’s supply and 9% of the total supply for the Management Area (EMWD, 2005a,b).
The usage of imported water for direct use has been variable over the past decades, as shown in Figure 4.30. The volume of water imported was reduced in 1991 as the importation of unfiltered Colorado River water to the Management Area was curtailed to meet the requirements of the Surface Water Treatment Rule, part of the Safe Drinking Water Act.
Imported water usage in recent years has increased, which in turn reduced the stress on groundwater resources in the Management Area.
0 1,000
2,000
3,000
4,000
5,000
6,000
7,000
19841986198819901992199419961998200020022004
Year
Imported Water (AFY)
Figure 4.30 Annual Imported Water Supply
4.8.3 RECYCLED WATER
Recycled water is treated at EMWD’s San Jacinto Valley Regional Water Reclamation Facility and is currently used primarily for irrigation in the public municipal areas, industrial uses, and agricultural irrigation purposes in the Management Area and for habitat creation at the California Fish and Game San Jacinto Wildlife Area outside the Management Area. Recycled water is a highly reliable source of supply and will increase in availability as the population of the Management Area increases. Most of the recycled water is sold by EMWD to private land owners for agricultural irrigation. Recycled water usage in the Management Area has been fairly stable over the past decades, with approximately 5,000 AF supplied in 2004. Annual amounts of recycled water use are presented in Figure 4.31. 81 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
0 1,000
2,000
3,000
4,000
5,000
6,000
7,000
19841986198819901992199419961998200020022004
Year
Recycled Water (AFY)
Figure 4.31 Annual Recycled Water Supply
4.8.4 SURFACE WATER
LHMWD has pre-1914 rights for the diversion and storage of surface water from the San Jacinto River and its tributaries. These rights date back to the late 1800s, and the diversion amounts are filed each year with the Division of Water Rights, State Water Resources Control Board on Annual Notices of Groundwater Extraction or Diversion, numbers G330016, G330017, and G330018.
When available, LHMWD diverts surface water for direct use. It should be noted that the San Jacinto River is an ephemeral river. The river may not flow every year and, therefore, there may be occasional years where diversion is not possible. Annual surface water diversions for 1985-2004 are shown in Figure 4.32. Details of the surface water rights are discussed in Section 7.1.
0 1,000
2,000
3,000
4,000
5,000
6,000
7,000
19851986198719881989199019911992199319941995199619971998199920002001200220032004 Year
Surface Water (AFY)
Figure 4.32 Annual Surface Water Supply
82 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
EMWD’s surface water diversions are not utilized for direct use and are therefore not considered part of the water supply. More information on EMWD’s surface water diversions is included in Section 7, Surface Water Rights.
4.8.5 PURCHASES FROM EMWD
LHMWD, City of Hemet, and City of San Jacinto purchase water from EMWD to supplement their water supplies. The annual volume of water sold to the other agencies by EMWD is shown in Figure 4.33. In addition to these sales, EMWD sells recycled water to private land owners for agricultural irrigation.
0 3,000
6,000
9,000
19841986198819901992199419961998200020022004
Year
EMWD Sales to Other Agencies
(AFY)
Figure 4.33 Annual Sales by EMWD to Other Agencies within Management Area
4.9 ESTIMATES OF SAFE YIELD AND OVERDRAFT
4.9.1 SAFE YIELD
The Safe Yield of the Management Area is defined in the Stipulated Judgment as the long term, average quantity of water supply in the Management Area that can be pumped without causing undesirable results, including the gradual reduction of natural groundwater in storage over long-term hydrologic cycles.
The following clarifying notes are presented to better define the Safe Yield definition:
Period of Record: Safe Yield is a function of annual variability of the hydrology, but should reflect long-term average conditions, including wet and dry replenishment conditions. Identification of “long term, average” is important, but difficult to determine, as precipitation is highly variable from year to year and subject to long-term climatic changes. As hydrologic data will continue to be 83 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
collected and a greater understanding of the hydrology will be gained, the period of record for determining the Safe Yield will be subject to change over time. Water Supply Components: The following components of water supply are considered in the definition of Safe Yield:
a. Natural recharge from infiltration of precipitation, b. Recharge from infiltration of streamflow and other surface water runoff, c. Recharge from infiltration of irrigation applied water on agricultural lands,
d. Recharge from infiltration of outdoor irrigation in the urbanized areas, e. Artificial recharge, such as replenishment programs, historically operated, using imported, recycled, and surface water diversions, f. Subsurface groundwater inflows, such as from the Lower Pressure Management Zone and the boundaries of the basin, and
g. Subsurface groundwater outflows, such as to the Lakeview portion of the Lakeview/Hemet North Management Zone.
Study Area: Safe Yield is calculated for the Management Area as one unit, and not by the smaller units of Management Zones.
Undesirable Effects: The definition of Safe Yield emphasizes protection of groundwater in storage. It is assumed that potential undesirable effects on water quality are indirectly addressed, and therefore are not included in the analysis.
The Safe Yield of the Management Area has been estimated in a number of studies in the past.
A summary of methods, hydrologic periods, and results from each study is presented in Table 4.5.
Two major methodologies have traditionally been used to estimate the Safe Yield: (1) Water Balance methodology, and (2) Change in storage methodology. These methods are briefly described below.
84 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
Table 4.5 Published Estimates of Safe Yield for the Management Area Yield Study Method Time
Period
Safe Yield
(AFY)
Pumping
(AFY)
Overdraft
(AFY)
Fritz and Rosell*, 1947 Water Balance
(Conventional)
1920-1945 27,400
(35,100 w/o
trees/brush)
32,400 4,800
Schwartz*, 1967 Water Balance
(Conventional)
1923-1960 26,100 n/a 12,100
EMWD White Paper,
2000
Water Level Recovery
Analysis
Variable 50,000 60,600 10,600
GIS Recharge Estimates Change in Storage (GIS) 1998-2003 39,700 n/a n/a WRIME, 2003d Water Balance
(Conventional)
1984-2001 44,700 59,000 14,300
Based on TechLink,
2002a
Water Balance (Modelbased) 1984-1999 41,300 58,000 16,700 * Fritz and Rosell (1947) and Schwartz (1967) both used a larger geographic area that roughly included what is today called the San Jacinto-Lower Pressure Management Zone. This additional area is the area northwest of Bridge Street to Redlands Boulevard in Moreno Valley.
4.9.1.1 Method 1 - Water Balance Method
The water balance method utilizes inflows and outflows from the basin to estimate change in storage and the Safe Yield of the basin. The amount of pumping that can be sustained with little or no long-term change in storage is the Safe Yield of the basin. The Safe Yield estimate may be calculated by
Safe Yield = Change in Groundwater Storage + Groundwater Production, where Change in Groundwater Storage is Inflows less Outflows. The estimate must be over a long-term base period which reflects a number of wet, normal, and dry periods. Groundwater production values are based on historical data as reported by the Public Agencies and estimated for the Private Water Producers. The TC has reviewed and agreed to the data for use in the Water Balance Method. The following inflow and outflow components are used to calculate Change in Groundwater Storage for the Management Area:
Inflows
Recharge from Retail Water Sales,
Recharge from Irrigation Return Flow,
Recharge from Precipitation,
85 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
Grant Avenue Ponds Diversion Recharge,
Reclaimed Ponds Recharge,
Recharge from Recycled Water Sales,
Subsurface Inflow from Other Management Zones,
Bautista Creek Recharge,
San Jacinto River Recharge, and
Boundary Inflow.
Outflows
Subsurface Outflow to Other Management Zones,
Boundary Outflow, and
Groundwater Production.
4.9.1.2 Method 2 - Change in Storage Methodology
This method uses a GIS database to develop surfaces of groundwater elevations based on observed groundwater levels at multiple control points (i.e., wells) throughout the Management Area for two different time periods. The product of change in volume between the two surfaces at two different times and the specific yield of the aquifer determines the change in storage between those two time points. The Safe Yield is then calculated as the sum of the calculated change in storage and the groundwater production during the same time period. Variations of this method are used based on the spatial distribution, including vertical distribution, of the specific yield in the aquifer system.
4.9.1.3 Summary of Previous Yield Estimates
Calculation of Safe Yield is a function of the hydrologic period used in the analysis. Figure 4.34 presents the long-term hydrologic conditions as precipitation at San Jacinto gaging station (RCFC&WCD Site #186), along with estimates of the Safe Yield. As indicated in the figure, the Safe Yield estimates range from 26,400 to 44,700 AFY. Since the two estimates made by Fritz & Rosell (1947) and Schwartz (1967) are based on much older data sets and short-term hydrologic records, and the geographic area may not be consistent with some of the more recent estimates, the TC decided in its August 25, 2005 meeting not to use these estimates. Instead, the TC concluded that the Safe Yield of the Management Area ranges from approximately 40,000 to 45,000 AFY based on the most recent analyses.
The TC also concluded that the following guidelines for estimation of Safe Yield of the Management Area be considered by the Watermaster when calculating Safe Yield in the future:
86 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
Figure 4.34 Safe Yield Estimates
-80-60-40-20
0 2040
1910
1915
1920
1925
1930
1935
1940
1945
1950
1955
1960
1965
1970
1975
1980
1985
1990
1995
2000
Year
San Jacinto Precipitation (Inches)
2000025000300003500040000450005000055000600006500070000 Yield (AFY)
Fritz and Rossel Water Balance- clear river channel35,100 AFYFritz and Rossel Water Balance 27,400 AFY Schwartz Water Balance 26,100 AFY
2003 OY Water Balance - 41,300 AFY
2003 OY Water Balance
69,000 AFY 2003 OY Water Balance
63,600 AFY
GIS
39,700 AFY
GW Model 41,400 AFY
2003 OY Water Balance29,300 AFY
2003 OY Water Balance 43,700 AFY
2003 OY Water Balance - 26,500 AFY
EMWD, 2000 White Paper 50,000 AFY
Cumulative Departure from Mean Annual Precipitation
Annual Precipitation Mean Annual Precipitation
Safe Yield = 40,000 - 45,000 AFY
* OY = Operational Yield Report
14.B.
State of the Management Area
Review and modify Safe Yield, if necessary, upon the recommendation of the TC or as the Watermaster may determine.
Use latest available data with consideration for proper spatial, temporal, and vertical characteristics of the aquifer system.
Consider a long period of record that includes above average, below average, and normal conditions.
Consider latest methodologies that can provide more flexibility based on the available data and information, as necessary.
Consider using the San Jacinto Watershed Groundwater Model, with appropriate updates and calibration, for re-estimation of groundwater conditions, as needed.
4.9.2 OVERDRAFT
Overdraft is defined in the Stipulated Judgment as the condition whereby groundwater production in the Management Area exceeds the Safe Yield, creating undesirable conditions in the basin. The amount of overdraft is calculated as the difference between long-term average annual groundwater production in the Management Area and Safe Yield. Figure 4.35 shows the estimated annual groundwater production in the Management Area, along with the range of Safe Yield. Based on this figure, the overdraft in the Management Area is estimated to be 10,000 to 15,000 AFY. For planning purposes and to evaluate options to reduce the overdraft, this Plan assumes that the overdraft is at least 10,000 AFY.
4.10 WATER QUALITY CONDITIONS
This section presents a summary of the groundwater quality conditions in the Management Area. This description will assist in establishing a baseline condition for future water management efforts to maintain or improve groundwater quality in the Management Area. The TC has decided that the water quality conditions in the Management Area would be evaluated based on TDS and nitrate levels. This is consistent with the TIN/TDS studies (Wildermuth, 2000) and the emphasis on TDS and nitrate in the Basin Plan as amended (RWQCB, 2004).
The Management Area lies within the jurisdiction of the RWQCB, Santa Ana Region 8. The RWQCB implements state and federal laws through adoption of Water Quality Control Plans or Basin Plans (RWQCB, 1995). The Basin Plan establishes both the legal beneficial use designations and sets the standards to protect these uses. The Basin Plan was recently amended (RWQCB, 2004) to incorporate an updated TDS and Nitrogen Management Plan for the Santa Ana Region, including revised groundwater Management Zones (combining Hemet North and Lakeview into one Management Zone; Hemet North remains treated separately from Lakeview 88 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
30,000
35,00040,00045,00050,00055,00060,00065,00070,00075,000
1958
1968
1978
1988
1998
Year
Annual Pumping and Safe Yield (AFY)
Annual Groundwater Production (AFY)
Figure 4.3
5 Groundwater Production and Range of Safe Yield Estimates Safe Yield: 40,000 – 45,000 AFY
Average Production: 54,800 AFY
14.B.
State of the Management Area
in this Plan), TDS and nitrate quality objectives for groundwater, TDS and Nitrogen waste load allocations, and stream reach designations.
Within the Santa Ana Watershed, which includes the Management Area, a statistical method has been developed to use nitrate (as N) and TDS to evaluate the status of water quality; to compare sub-basin concentrations; and to trigger management actions (RWQCB, 2004; Wildermuth, 2000, 2005). Point statistics were used to show (i) historical ambient water quality conditions as represented by the 1954-1973 time period, (ii) 1997 Current ambient water quality conditions as represented by the 1978-1997 time period, and (iii) 2003 Current ambient water quality conditions as represented by the 1984-2003 time period. A summary of the data is shown in Table 4.6, revealing nitrate (as N) levels below the MCL of 10 mg/L for all cases. TDS exceeds the recommended secondary MCL of 500 mg/L in Hemet South (current and historical) and Hemet North (current and historical), and TDS exceeds the maximum secondary MCL of 1000 mg/L in the 1997 current levels in Hemet South.
Table 4.6 Historical (1954-1973), 1997 Current (1978-1997), and 2003 Current (1984- 2003) Ambient Nitrate as N and TDS Concentrations (mg/L) Nitrate as N 1 TDS2
Subbasin Basin Plan
Objective3 Historical
1997
Current
2003
Current
Basin Plan
Objective4 Historical
1997
Current
2003
Current
Canyon 2.5 2.5 1.6 2.1 230 234 220 420
Upper
Pressure
1.4 1.4 1.9 1.7 320 321 370 370
Hemet
South
4.1 4.1 5.2 5.4 730 732 1030 850
Hemet
North
1.8 1.8 2.7 3.4 520 519 830 840
Source: Wildermuth, 2005. 2003 update 1984-2003)
1 Table 3-2
2 Table 3-1
3 Basin Plan Amendment, 2004 (Table 5-4)
4 Basin Plan Amendment, 2004 (Table 5-3)
The point statistics and water quality objectives were used by the RWQCB to develop estimates of assimilative capacity. Areas with assimilative capacity are able to accept waters with higher concentrations of a constituent than the concentration in the receiving waters because natural processes such as recharge and dilution will allow for the water quality objectives to continue to be met. The most recent computations indicate that Hemet South, Hemet North, Canyon, and Upper Pressure Management Zones do not currently have assimilative capacity for TDS. For nitrate, the Hemet South, Hemet North, and Upper Pressure Management Zones do not have 90 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
State of the Management Area
assimilative capacity remaining, and the Canyon area has only a very small amount of nitrate that it can assimilate (0.4 mg/l nitrate as N; Wildermuth, 2005).
Table 4.7 shows the changes seen over the 30-year time period between the historical and 2003 Current time periods. The Canyon Management Zone shows a decrease in nitrate as N concentrations while all other nitrate (as N) and TDS concentrations for all other Management Zones show increases in concentrations of between 0.3 and 1.6 mg/L nitrate (as N) and 49 to 321 mg/L TDS. It should be noted that changes seen between these time periods are a combination of true changes in ambient water quality and artificial changes due to limitations in monitoring data and the estimation technique (Wildermuth, 2005). In the future, as current monitoring programs assemble more data, a long-term record of analytical data at specific wells will be available to better show changes over time at specific locations.
Table 4.7 Change in Ambient Concentration (mg/L) of Nitrate as N and TDS, Between Historical (1954-1973) and 2003 Current (1984-2003) Time Periods Sub-basin
Change in
Nitrate as N
(mg/L)
Change in TDS
(mg/L)
Canyon -0.4 186
Upper Pressure 0.3 49
Hemet South 1.3 118
Hemet North 1.6 321
The most recent data from public and private wells, as complied by EMWD, were used to plot the 2004 nitrate (as N) and TDS conditions as shown in Figures 4.36 and 4.37. While these values are taken from wells screened at different depths, the plots show the general variability in concentrations across the Management Area.
91 Hemet/San Jacinto Groundwater Management Area
Water Management Plan
14.B.
!
!
!
!
!
!
!
!
!
!
!
!
! !
!
! !
!
!
!
!
!
!!
!
!
!! !
!
!
!
!
!
! !
!
!
!
!
!
!
!!
!
!
!
!
!
!
!
!
!
!
!!!
!!
!
!
!
!
!
!
!
!
!! !
!
!!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!! !
!
! ! !
!! ! !
!
!
! !
!
!
! !
!
!!
! !
!
!
! !!
!
!
!
!
!
! !
!
!
!
!
!
!
!
!
!
!
!
San Jacinto River
Diamond Valley Lake
Lake Skinner
Hemet
San Jacinto
·|}þ79
·243 |}þ
·|}þ74
·|}þ79
Legend
Nitrate as N (mg/L)*
! 0 - 2
! 3 - 5
! 6 - 10
! 11 - 15
! 16 - 30
! Over 30
! Cities
Major Watercourses
Lakes and Reservoirs
Major Roads
Management Area
October 2007
Hemet / San Jacinto Water Management Plan
2004 Nitrate as N Concentrations in Groundwater (mg/L)
Figure 4.36
01 0.5
Miles
±
*Source: EMWD Page 1284 of 1949
14.B.
!
!
!
!
!
!
!
!
!
!
!
!
! !
!
! !
!
!
!
!
!
!!
!
!
!! !
!
!
!
!
!
! !
!
!
!
!
!
!
!!
!
!
!
!
!
!
!
!
!
!
!!!
!!
!
!
!
!
!
!
!
!
!! !
!
!!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!! !
!
! ! !
!! ! !
!
!
! !
!
!
! !
!
!!
! !
!
!
! !!
!
!
!
!
!
! !
!
!
!
!
!
!
!
!
!
!
!
San Jacinto River
Diamond Valley Lake
Lake Skinner
Hemet
San Jacinto
·|}þ79
·243 |}þ
·|}þ74
·|}þ79
Legend
TDS (mg/L)*
! 0 - 500
! 501 - 750
! 751 - 1000
! 1001 - 1500
! 1501 - 3000
! Over 3000
! Cities
Major Watercourses
Lakes and Reservoirs
Major Roads
Management Area
October 2007
Hemet / San Jacinto Water Management Plan
2004 TDS Concentrations in Groundwater (mg/L)
Figure 4.37
01 0.5
Miles
±
*Source: EMWD Page 1285 of 1949
14.B.