CC 2024-08-27_11a NCMA Annual Rpt_PPNCMA 2023 Annual Report
Ag Representatives Meeting
GSI Water Solutions, Inc.
August 19, 2024
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Presentation Overview
Introduction
Goal: Coordination with Ag Reps
2023 Hydrology (Precipitation and Evapotranspiration)
2023 Water Demand
Groundwater Basin Conditions
Key Findings
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Santa Maria Groundwater Basin (SMGB)
Three management areas:
Northern Cities Management Area
(NCMA)
Nipomo Mesa Management Area
(NMMA)
Santa Maria Valley Management Area (SMVMA)
Court ordered monitoring program and Annual Report (Santa Maria Groundwater Basin Adjudication)
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prepared pursuant to the requirements of the 2005 Stipulation for the Santa Maria Groundwater Basin Adjudication (2005 Stipulation) and the January 25, 2008 Judgment After Trial (2008
Judgment).
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Northern Cities Management Area
City of Arroyo Grande
City of Pismo Beach
City of Grover Beach
Oceano Community Services District
Private Users
Agricultural Irrigation
Rural Use
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2023 Hydrology
Average annual rainfall –
15.6 inches
Rainfall in 2023: 23.75 inches
Above average rainfall in
7 of 12 months
ETo1 exceeded rainfall in 8 of 12 months
1 – Reference Evapotranspiration (ETo) recorded at Nipomo CIMIS Station
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NCMA Agricultural Land in 2023
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Estimated Ag Pumpage in 2023
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NCMA Pumpage from SMGB in 2023
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NCMA Total Water Use in 2023
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Historical NCMA Production/Delivery
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Locations of Monitoring Wells
5 coastal well clusters
15 wells total
Deep Well Index:
Average of water levels in 3 coastal wells:
(24B03, 30F03, and 30N02)
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Groundwater
Levels
Spring 2023
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Yellow Contours:
Alluvial Aquifer (Cienega Valley)
Blue Contours:
Deep Aquifer System
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Groundwater
Levels
Fall 2023
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Yellow Contours:
Alluvial Aquifer (Cienega Valley)
Blue Contours:
Deep Aquifer System
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Historical Deep Well Index
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Key Findings
Total 2023 NCMA Water Use – 7,403 AF
(8,165 AF in 2022)
Lopez Lake – 3,493 AF (2,936 AF in 2022)
State Water Project – 1,213 AF
(1,704 AF in 2022)
Groundwater – 2,697 AF (3,523 AF in 2022)
Other Groundwater – 0 AF
(2 AF in 2022)
Total Urban Water Use – 5,240 AF
(lowest in at least 25 years!)
Total Agricultural Irrigation – 2,045 AF
Groundwater pumping is 28% of 9,500 AFY safe yield
Estimated increase of 3,610 AF of groundwater in storage (April 2022 to April 2023)
(largest increase since tracking began in 2016!)
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Questions?
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