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CC 2024-08-27_11a NCMA Annual Rpt_PPNCMA 2023 Annual Report Ag Representatives Meeting GSI Water Solutions, Inc. August 19, 2024 1 Presentation Overview Introduction Goal: Coordination with Ag Reps 2023 Hydrology (Precipitation and Evapotranspiration) 2023 Water Demand Groundwater Basin Conditions Key Findings 2 2 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) 3 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). 3 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 4 4 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 5 5 NCMA Agricultural Land in 2023 6 6 7 Estimated Ag Pumpage in 2023 7 NCMA Pumpage from SMGB in 2023 8 8 NCMA Total Water Use in 2023 9 9 Historical NCMA Production/Delivery 10 10 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) 11 11 Groundwater Levels Spring 2023 12 Yellow Contours: Alluvial Aquifer (Cienega Valley) Blue Contours: Deep Aquifer System 12 Groundwater Levels Fall 2023 13 Yellow Contours: Alluvial Aquifer (Cienega Valley) Blue Contours: Deep Aquifer System 13 Historical Deep Well Index 14 14 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!) 15 15 Questions? 16