GSP Annual Report
5-021.69 WYANDOTTE CREEK
2022 (OCT. 2021 - SEP. 2022)
Single Annual Report
GSP Annual Report Information Comments
A Groundwater Extraction
Total Groundwater Extractions (AF)
82,000
Water Use Sectors
700
0
43,500
0
0
36,300
1,500
Rural Residential
B Groundwater Extraction Methods
Meters
700
Direct
5-10 %
Metered Municipal Wells
Metered connection maintained by California Water Service and Thermalito Water and Sewer District.
Electrical Records
0
Land Use
79,800
Estimate
20-30 %
Land use estimates were derived from crop mapping and LandIQ survey results
Typical uncertainty for water balance calculation
Groundwater Model
0
Other
1,500
Estimate
10-20 %
Rural residential groundwater extraction is estimated based on California Water Service Company's 2020 Urban Water Management Plan 2020 usage of an average per capita water use of 184 gallons per capital per day. Population data from the 2020 census was coupled with parcel data to identifu total population not serviced by municipal supplies.
Uncertainties are from population estimates and gpcd estimates
C Surface Water Supply
Total Surface Water Supply (AF)
16,200
Methods Used to Determine
Diversions for local supplies are estimated based on historic State Water Resource Control Board eWRIMS (Electronic Water Rights Information Management System) data for total diversions. Surface water delivery estimates are based on historic deliveries in the area that have occurred in dry and critical years.
Water Source Types
0
0
0
16,200
0
0
0
0
D Total Water Use
Total Water Use (AF)
98,200
Methods Used to Determine
Where available, groundwater extraction and surface water supplies were quantified directly from measured and reported groundwater pumping, surface water diversions, and deliveries data. However, groundwater extraction data has historically been limited, particularly for privately-owned wells. Thus, a water budget approach has been used to estimate the remaining, unmeasured volume of groundwater extraction that has occurred to meet demand in the Subbasin. water budget approach used in this Annual Report utilizes available geospatial data and information to quantify crop water demand, precipitation, and other parameters with pixel-scale resolution (30-meter (m) x 30 m), corresponding to the spatial resolution of satellite imagery used in developing these inputs. In addition to geospatial data, available surface water supply and groundwater extraction data is incorporated into the water budget by distributing that water out to specific regions where that water is used (e.g., surface water supplier service areas). Surface water supplies are reported directly from water supplier records or collected from publicly available sources (water rights diversion records, etc.) where available.
Water Source Types
82,000
16,200
0
0
0
Water Use Sectors
4,700
0
54,400
0
0
37,600
1,500
Rural Residential
E Change in Storage
Method used to calculate change in storage
Change in groundwater storage was estimated based on change in measured spring-to-spring groundwater levels at each RMS well, multiplied by the area of a Thiessen polygon surrounding that RMS well (defining a representative area for each RMS well) and a representative storage coefficient of 0.1 for the principal aquifer.
