CC 2019-09-10_11a 2018 NCMA Annual Report_PresentationNCMA 2018 Annual Report
Ag Representatives Meeting
Paul Sorensen and Nate Page
GSI Water Solutions, Inc.
August 9, 2019
GSI Water Solutions, Inc.
Presentation Overview
•2018 Hydrology (Precipitation and
Evapotranspiration)
•2018 Water Demand
•Groundwater Basin Conditions
•Key Findings
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Santa Maria
Groundwater
Basin
•Three management
areas (NCMA,
NMMA, SMVMA)
•Mandated
monitoring program
and Annual Report
Northern Cities
Management
Area
•City of Arroyo Grande
•City of Pismo Beach
•City of Grover Beach
•Oceano Community Services District
•Private Users
GSI Water Solutions, Inc.
Hydrology
•Average annual rainfall –
15.6 inches
•Rainfall in 2018 –11.2
inches
•Below average rainfall in
11 of 12 months
•ET exceeded rainfall in 8
of 12 months
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Annual Precipitation 1950-2018
NCMA Agricultural Land 2018
GSI Water Solutions, Inc.
Estimated Ag Pumpage -2018
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Monthly Applied Water (AF)Annual
Total
(AF)Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Rotational Crops
(AF)--1 130 335 280 522 363 358 261 226 -2,477
Strawberry (AF)-----16 25 40 33 24 --138
Avocados (AF)-----2 6 6 5 4 3 -25
Flowering and
Nursery (AF)1 -----1 3 3 2 1 -11
Total 1 -1 130 335 296 548 411 399 291 230 -2,651
GSI Water Solutions, Inc.
NCMA Pumpage from SMGB -2018
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Agency 2018 Groundwater Use
(AF)
Percent Pumped of
Groundwater Allotment
City of Arroyo Grande 49 4%
City of Grover Beach 416 30%
City of Pismo Beach 53 8%
Oceano CSD 246 27%
Total Urban Groundwater Use 764 18%
Agricultural Water Supply Requirement 2,651 53%
Nonpotable Irrigation by Arroyo Grande 62 --
Rural Water Users 81 --
Total NCMA Groundwater Use 3,558 37%
GSI Water Solutions, Inc.
NCMA Total Use -2018
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Urban Area Lopez Lake State Water
Project
SMGB
Groundwater
Other
Supplies Total
Arroyo Grande 2,163 0 49 0 2,212
Grover Beach 804 0 416 0 1,221
Pismo Beach 1,426 242 53 0 1,720
Oceano CSD 480 0 246 0 725
Urban Water Use Total 4,873 242 764 0 5,878
Agricultural Water
Supply Requirement 0 0 2,651 0 2,651
Rural Water Users 0 0 81 0 81
Applied Irrigation by
Arroyo Grande 0 0 62 0 62
Total 4,873 242 3,558 0 8,672
Historical NCMA Production/Delivery
Locations of
Monitoring
Wells
•5 coastal well
clusters
•16 wells total
GSI Water Solutions, Inc.
Groundwater
Levels
Spring 2018
13
GSI Water Solutions, Inc.
Groundwater
Levels
Fall 2018
14
GSI Water Solutions, Inc.
Historical April Deep Well Index
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GSI Water Solutions, Inc.
Key Findings
•Total 2018 NCMA Water Use –8,672 AF (8,519
AF in 2017)
•Lopez Lake –4,873 AF (4,553 AF in 2017)
•State Water Project –242 AF (451 AF in 2017)
•Groundwater –3,558 AF (3,456 AF in 2017)
•Other Groundwater –0 AF (59 AF in 2017)
•Groundwater pumping is 37% of 9,500 AFY safe
yield
•Estimated decrease of 600 AF of groundwater in
storage (expected to be less given rainfall year)
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GSI Water Solutions, Inc.
Why Aren’t Water Levels Higher?
•Continued effects of drought, unequal
distribution of rainfall events
•Reduction of recharge from east due
to overdraft on Mesa
•Not because of overpumping in NCMA
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GSI Water Solutions, Inc.
Threats
•Continued overdraft on Mesa
(currently 7,000 to 8,000 AFY)
•Sea water intrusion
•Potential increased groundwater
demand in NCMA
•Threat to Lopez Lake supply
•Threat to SWP deliveries
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Questions?