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GSP Annual Report

5-021.57 VINA
2021 (OCT. 2020 - SEP. 2021)
Single Annual Report

GSP Annual Report Information Comments

03/30/2022 4:31 PM

2021 (OCT. 2020 - SEP. 2021)

Single Annual Report
5-021.57 VINA
Christina Buck (Butte County Department of Water and Resource Conservation)

A Groundwater Extraction

Total Groundwater Extractions (AF)

267,980

Water Use Sectors

23,280
0
242,400
0
0
0
2,300
Rural Residential

B Groundwater Extraction Methods

Meters

23,280
Direct
5-10 %
Metered Municipal Wells
Metered connections maintained by California Water Service and Durham Irrigation District

Electrical Records

0

        

        

Land Use

242,400
Estimate
20-30 %
Land use estimates were used with locally derived crop coefficients and irrigation efficiencies. Groundwater pumping estimated after precipitation and surface water deliveries were accounted for.
Typical accuracy for crop coefficient and reference ET methodology.

Groundwater Model

0

        

        

Other

2,300
Estimate
10-20 %
Rural residential groundwater extraction is estimated based on the California Water Service Company?s 2020 Urban Water Management Plan?s 2020 usage of an average per capita water use of 184 gallons per capita per day. Population data from the 2020 census was coupled with parcel data to identify total population not serviced by municipal supplies.  
Uncertainties arise from population estimates and gpcd estimates

C Surface Water Supply

Total Surface Water Supply (AF)

9,700

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
9,700
0
0
0
0

        

D Total Water Use

Total Water Use (AF)

277,680

Methods Used to Determine

Methods used are a combination of estimates based on land use and population/per capita water use, metered municipal/industrial water use, and estimates based on historic water rights data for dry and critical years.

Water Source Types

267,980
9,700
0
0
0

        

Water Use Sectors

23,280
0
252,100
0
0
0
2,300
Rural Residential (private domestic wells)

E Change in Storage


Method used to calculate change in storage

Estimated change in storage was based on groundwater level change from spring 2020 to spring 2021 at each RMS well, a representative storage coefficient of 0.1, with Thiessen polygons defining a representative area for each RMS well.  The representative storage coefficient was established by roughly calibrating estimated change in storage based on changes in observed water levels (i.e. calculated using water level data, representative area, and storage coefficient parameter) with estimated change in storage outputs from the Butte Basin Groundwater Model as reported in the GSP to aggregate characteristics across all zones of the principal aquifer system. A total of 20 pairs of concurrent annual storage changes from both of these methods (i.e., 1. groundwater level change method used in this report, and 2. modeled storage changes from the GSP) from 1999 through 2018 were used for calibration.

F Monitoring Network Module

SGMA Wells Elevation Readings Export (CSV)


General Sites Elevation Readings Export (CSV)