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NOTICE REGARDING (COVID-19)
Before we begin, the record will reflect that pursuant to the provisions
of Executive Order N-29-20 issued by Governor Gavin Newsom on
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Call to Order
Board of Directors Workshop - Resources
Thursday, February 4, 2021
Chairperson – Director Hayes
Vice-Chair – Director Harrison
Introductions
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Public Comment
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Summary of Previous Meeting
(Pg. 3)
Discussion Item 4.1
(Pg. 7)Consider Geoscience Proposal to Calculate the Total Volume
in Storage for the Yucaipa Basin and Subbasins
Matt Howard, MS
– Water Resources Senior Project Manager
Staff Recommendation
Staff recommends the Board direct staff to place this item on a future Board of Directors regular meeting agenda for consideration.
Task 1: Perform the Total Volume in Storage Calculation on all of the nine (9) Subbasins of the Yucaipa Basin
The Upper Santa Ana River Integrated
Model (Integrated SAR Model) will be used for this Study
Two groundwater base elevations will
be evaluated:
1. 1,700 ft bgs which represents the deepest production well in the Yucaipa Basin
2. The top of bedrock representing total groundwater storage
Task 2: Draft and Final Technical Memorandum
The Technical Memorandum that
summarizes the study methodology and estimated groundwater storage for the Yucaipa Basin and each Subbasin
Task 3: Preparation and attend one meeting to present the results of the Study
Total Cost for Study: $14,158 Schedule: 4 weeks to complete
Total Volume in Groundwater Storage Study
Reference: Moreland, 1970,
Director Comments and Discussion
Staff Recommendation
Staff recommends the Board direct staff to place this item on a future Board of Directors regular meeting agenda for consideration.
T. Milford Harrison Treasurer Susan Longville Director June Hayes
Vice President BotelloGil J. Director Paul
Kielhold President
Discussion Item 4.2
(Pg. 14)Presentation on Water Supply Conditions
Adekunle Ojo, MPA –
Manager of Water Resources
Bob Tincher, PE, MS –
Chief Water Resources Officer/Deputy GM
Staff Recommendation
AGENDA
I. Setting the Context: Water Supply Portfolio and California’s Hydrology
II. State Water Project Conditions
III. Local Water Supply Conditions
Water Supply
Portfolio
Reliable Water Supply
• 72% Local Supply
• Storage
• Stormwater Capture • Demand Reduction
• 5% Recycled Water
= 77% of local water supply
• 23% Imported Water Recycled Water 5% Local Supply – Groundwater and Surface 72% SBBA 85% Rialto-Colton 6% Yucaipa 5% Riverside North 4%
California’s
Hydrology
-Feast or
Famine
- Mediterranean Climate
- Generally warm, dry summers and mild, wet winters
- Climate vary depending on geographic region
- Climate Variability
- Can swing from wet years to dry years and back again
- Precipitation is greater in the northern half; population is greater in the southern half
- Water Year (Oct. 1 – Sep. 30)
- November – March: 75% of
annual precipitation (rain, snow and hail) during these months
- December – February:
Bulk of the precipitation during these 3 months
- Atmospheric Rivers
- E.g. Pineapple Express, Level 3 Storm (Jan 26 -31, 2021)
Atmospheric rivers (a small number of large winter storms) in December, January, and February are responsible for the bulk of precipitation
A handful of atmospheric rivers – or lack thereof – during the winter season can determine if the year is wet or dry
Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep
1 2 3 4 5 6 7 8 9 10 11 12
State Water Project
Conditions
Summary of
SWP Water
Conditions –
as of Feb. 1, 2021• Initial Table A Allocation
(Nov. – Dec.) = 10%
• Allocation revised in April
or May = median final allocation (2010 – 2020) is 50%
• Oroville at 54% of
historical average; San Luis at 66%
• On the following pages:
• Northern Sierra
Precipitation: 51% of average for this date
• Average Snow Water
Equivalents: 11.8”, 68% of average for this date
Local Water Supply
Conditions
-225 -200 -175 -150 -125 -100 -75 -50 -25 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 0 10 20 30 40 50 60 70 80 19 30 -31 19 32 -33 19 34 -3 5 19 36 -37 19 38 -39 19 40 -4 1 19 42 -4 3 19 44 -4 5 19 46 -4 7 19 48 -4 9 19 50 -51 19 52 -53 19 54 -55 19 56 -57 19 58 -59 1960 -61 1962 -63 1964 -6 5 1966 -67 1968 -69 1970 -71 1972 -73 1974 -75 1976 -77 1978 -79 19 80 -81 19 82 -83 19 84 -85 19 86 -87 19 88-89 1990 -91 1992 -93 1994 -9 5 1996 -97 1998 -99 200 0-01 20 02 -03 20 04 -05 200 6-07 20 08 -09 201 0-11 201 2-13 20 14 -15 201 6-17 20 18 -19 20 20 -21 Cu m ul at iv e D ep ar tu re f ro m S af e Y iel d P er io d A vg (i n. ) A ver ag e A nn ua l P reci pi ta ti on (i n. ) Water Year
Average of Lytle Creek / Big Bear (SAR) / Mill Creek - Precip Data Safe Yield Period Avg (1934-1960)
Historic Average (1931-Present) Cumulative Departure from Safe Yield Period Avg
30
0 10 20 30 40 50 60 70 80
October November December January February March April May June July August September
CU M U LA TI V E D A ILY /M O N TH LY P RE CI PI TA TI O N (I N CH ES )
WATER YEAR (OCTOBER - SEPTEMBER)
San Bernardino Basin Area Three Station Precipitation Index
Historic Average (1931-Present) Safe Yield Average(1934 - 1960) 2017-18 2018-19 2019-20 2020-21 1992-1993 (Wettest) 76.9% 2001-2002 (Driest) 7” 2017-18, 14.61” 2018-19 (Wet) 37.38” 2019-2020, 27.82” 2020-2021, 8.16”
4,867,998 2,275,438 1,528,121 722,000 56,000 822,002 520,562 782,879 419,000 39,000 1,000,000 2,000,000 3,000,000 4,000,000 5,000,000 6,000,000 7,000,000 San Bernardino
Basin Yucaipa Basin Rialto-ColtonBasin Riverside Basin Arlington Basin
Total Usable Groundwater Storage
Storage – a
regional
asset
200,000 400,000 600,000 800,000 1,000,000 1,200,000 0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 19 72 19 73 19 74 19 75 19 76 19 77 19 78 19 79 19 80 19 81 19 82 19 83 19 84 19 85 19 86 19 87 19 88 19 89 19 90 19 91 19 92 19 93 19 94 19 95 19 96 19 97 19 98 19 99 20 00 20 01 20 02 20 03 20 04 20 05 20 06 20 07 20 08 20 09 20 10 20 11 20 12 20 13 20 14 20 15 20 16 20 17 20 18 20 19 20 20 (ACR E -F EET )SWP Deliveries into Valley District Service Area,
1972-current
Current Cumulative Total: 971,897 Acre-Feet
0 1,000,000 2,000,000 3,000,000 4,000,000 5,000,000 6,000,000 19 35 19 38 19 41 19 44 19 47 19 50 19 53 19 56 19 59 19 62 19 65 19 68 19 71 19 74 19 77 19 80 19 83 19 86 19 89 19 92 19 95 19 98 20 01 20 04 20 07 20 10 20 13 20 16 20 19
San Bernardino Basin Usable Storage (in acre-feet)
Usable Storage: 5,690,000 acre-feet (constrained by liquefaction potential)
2021 Water Supply
Planning –
Options and
Opportunities
5% 25% 60% 30% 5% 10% 10% 20% 15% 10% 10% 10% 50% 80% 65% 35% 5% 20% 60% 85% 35% 75% 20% 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
SWP TABLE ALLOCATION HISTORY 2010 - 2020
INITIAL MEDIAN - 10%
FINAL MEDIAN - 50%
SWP Table A Allocations Initial SWP Table A Allocations Final
Director Comments and Discussion
Staff Recommendation
Receive and file.
T. Milford Harrison Treasurer Susan Longville Director June Hayes
Vice President BotelloGil J. Director Paul
Kielhold President
