SLIDE 1
Michael Burke, C.Hg. Pueblo Water Resources, Inc.
CARPINTERIA GROUNDWATER BASIN AB3030 GROUNDWATER MANAGEMENT PLAN ANNUAL REPORT WATER YEAR 2017 Michael Burke, C.Hg. Pueblo Water Resources, Inc.
SLIDE 2 AB 3030 Groundwater Management Plan
- AB 3030 Allowed Local Agencies to Develop GWMPs for
DWR Bulletin 118 GW Basins.
- CVWD Adopted Plan for CGB in 1999.
- Provides Mechanism for Systematic Data Collection and
Analysis.
- Monitor Hydrogeologic Conditions with the Carpinteria
Groundwater Basin (CGB).
- Identify Important Trends in Water Levels and Water
Quality Throughout the Basin.
SLIDE 3 Components of CGB GWMP
- Precipitation Data
- Groundwater Pumpage
- Water Levels
- Groundwater Quality
- Surface Water Quality
- Hydrologic Budget
SLIDE 4 Monitoring Program
- Monitoring Well Network: 42 Wells throughout
the CGB (District and Private wells).
- Water Level data from Approx. 25 wells on a Bi‐
monthly basis.
- Water Quality samples collected from Approx. 25
wells on a Bi‐annual basis – Spring and Fall of each Water Year.
- Water Quality samples collected from 6 surface
water locations throughout the CGB during the Spring and Fall.
SLIDE 5
Monitoring Well Network
SLIDE 6 CGB Cross‐Section
2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 22000 24000 26000 28000 30000 Distance Along Section Line (ft.)
- 4000
- 3500
- 3000
- 2500
- 2000
- 1500
- 1000
- 500
500 1000 Elevation (ft. msl) 24G2 (White) 19L2 (Ocean Breeze) 29D8 (CVWD SY/HQ) 29Na (Shepard #1) 28F7 (CVWD TH #1) 28K3 (Kono) 27P5 (CVWD TH #3) 27Ha (Gobernador #1) 26F1 (Berberet)
SESPE FM (Ts) CASITAS FM (Qc)
A A'
? ? ? ? ? ? ? ?
Alluvium Aquifer A Aquifer B Aquifer C Aquifer D
SANTA BARBARA FM (TQsb)
Old Alluvium
420' 600' 950' 3983' 1456' 3310' 510' 983' 505'
SLIDE 7 Precipitation Data
- Data from SB County Carpinteria Fire Station
Gauge.
- Average over WY 1985 – 2017 Period = 18.4
inches.
- Cumulative Departure Curve Shows Wet and
Dry Periods.
- WY 2017 Total = 21.8 in., 121 % of Average.
- WY 2018 Total = 8.96 in.
SLIDE 8
Precipitation Data
SLIDE 9 Groundwater Production Data
- Pumpage from District Wells is Metered.
- Pumpage from Private Wells Estimated by District
Using Land Use Surveys and Water Delivery Information.
- 33 Year Average of 3,917 acre feet per year (afy).
- WY 2017 Total of 4,556 af, 16% Higher than Ave.
- WY 2017 District Pumpage = 1,235 af.
- WY 2017 Private Pumpage = 3,321 af.
SLIDE 10
Groundwater Production Data
SLIDE 11 Water Level Data
- Water Levels Measured Every Other Month
- Hydrographs for Individual Wells in Storage Units 1
and 2 (mostly SU1)
- Basin Wide Water Level Contours for the Spring and
Fall of Each Water Year (Storage Unit 1 Only)
SLIDE 12
Hydrographs
SLIDE 13
Key Hydrographs – Well 4N/25W‐19F4
(Storage Unit 1)
SLIDE 14
Key Hydrographs – Well 4N/25W‐35E1
(storage unit 2)
SLIDE 15 Water Level Contours
- Basin Wide Evaluation of Water Level
Conditions.
- Identify General Patterns of Groundwater
Flow.
- Reveal Recharge Areas and Pumping Troughs.
- Project of Water Level Conditions at Margins
- f the Basin (i.e. along the coast in western
portion of SU1).
SLIDE 16
Water Level Contours
(Spring WY 2017)
SLIDE 17
Water Level Contours
(Fall WY 2017)
SLIDE 18 Water Quality Data
- Samples Collected in Spring and Fall.
- Irrigation Suitability Analysis includes Analysis for Minerals,
TDS, and Nitrates.
- Chemical Hydrographs Allow for Tracking CGB Water
Quality.
- CGB Contains Relatively High Quality Groundwater.
- TDS ranging between 600 and 900 mg/L.
- Chlorides ranging between 40 and 80 mg/L.
- Some Localized Areas with Elevated Nitrates.
- No Evidence of Seawater Intrusion.
SLIDE 19
Chemical Hydrographs
SLIDE 20
Chemical Hydrographs
SLIDE 21 Hydrologic Budget
- HB is an Accounting of All the Components of CGB GW
Inflow and Outflow.
- Allows for Quantification of CGB Recharge and Storage
Changes.
- Updated for WY 1985 through WY 2008 for CGB
Hydrogeologic Update and Model Project (PWR 2012).
- Annual Updates Included in Annual AB3030 Reports.
SLIDE 22 Hydrologic Budget Components
Inflows
- Subsurface Inflow (from mountain bedrock)
- Stream Percolation
- Percolation of Rainfall
- Irrigation Return Flows
Outflows
- Subsurface Outflow (to ocean)
- Groundwater Pumpage
- Evapotranspiration
SLIDE 23
Hydrologic Budget
SLIDE 24
Hydrologic Budget
SLIDE 25 Hydrologic Budget WY 2017
- + 834 af Storage Accretion in WY 2017
- First Accumulation of Aquifer Storage Since
WY 2011
SLIDE 26 Groundwater Sustainability Plan (GSP) Scoping Analysis
- Sustainable Groundwater Management Act
Requires Development of GSPs for Priority Basins.
- Comparative Analysis of GSP vs. AB 3030 GWMP
for Carpinteria Groundwater Basin.
- Monitoring Well Network Key to Both Programs
to Monitor, Track, and Measure Sustainability Components.
- Technical Memorandum Prepared by Bondy
Groundwater Consulting Inc.
SLIDE 27 Groundwater Sustainability Plan (GSP) Requirements for GSP Monitoring Network
- Known Well Construction Details
- Non‐Pumping Wells
- Aquifer (Zone) Specific Monitoring
- Key Locations to Monitor Conditions in Basin
Management Areas
SLIDE 28 WY 2017 Conclusions
- Above Average Rainfall in WY 2017.
- Water Levels Recovery at Most Wells.
- Water Levels Below Sea Level in Central Portion
- f SU1 and Along Coast.
- Water Quality Stable, No Significant Trends.
- CGB GW Storage Accretion in WY 2017.
SLIDE 29 Recommendations
- Continue GWMP in Existing Form.
- Install Sentry Wells at Coast in Western Portion
- f Storage Unit 1 and include Sentry Wells in
CGB GWMP.
- Gradually Transition AB 3030 Program to be
SGMA/GSP Compliant.
SLIDE 30
Discussion
