GSP Annual Report
1-003 BUTTE VALLEY
2021 (OCT. 2020 - SEP. 2021)
Single Annual Report
GSP Annual Report Information Comments
03/30/2022 1:33 PM
2021 (OCT. 2020 - SEP. 2021)
Single Annual Report
A Groundwater Extraction
Total Groundwater Extractions (AF)
88,000
Water Use Sectors
400
0
87,600
0
0
0
0
B Groundwater Extraction Methods
Meters
0
Electrical Records
0
Land Use
0
Groundwater Model
87,600
Estimate
60-70 %
Butte Valley Integrated Hydrologic Model
Model results are estimated to have medium accuracy due to documented data gaps.
Other
400
Estimate
80-90 %
Population data from DWR (https://gis.water.ca.gov/app/bp-dashboard/final/) to estimate urban water demand.
Data source 2010 US Census for basin population. Estimate an average annual water use of 1 acre-foot per 3.5 persons.
C Surface Water Supply
Total Surface Water Supply (AF)
0
Methods Used to Determine
None. All streams entering the groundwater basin had no stream gages in WY 2021 and thus surface water supply cannot be estimated.
Water Source Types
0
0
0
0
0
0
0
0
D Total Water Use
Total Water Use (AF)
88,000
Methods Used to Determine
Methods for groundwater use is the Butte Valley Integrated Hydrologic Model and an estimate based on the Census population in the groundwater basin. Applied surface water is a data gap in WY 2021 and an estimate cannot be determined. Applied water for managed wetland and native vegetation water use sectors is a data gap.
Water Source Types
88,000
0
0
0
0
Water Use Sectors
400
0
87,600
0
0
0
0
E Change in Storage
Method used to calculate change in storage
The change in groundwater storage for the Basin is calculated based on the change in groundwater levels between fall of the report water year and previous water year. The groundwater contours are cropped to the extent of the groundwater level monitoring points to avoid low accuracy contours, thus the groundwater storage change is only calculated for the portion of the Basin where there is sufficient groundwater level data. Additionally, groundwater level stations are only used if they exist in both the current and previous year to avoid discrepancies in groundwater contour due to a lack of historic data. As more groundwater level monitoring stations are installed during plan implementation the groundwater contours will cover more of the Basin producing more accurate change in groundwater storage estimates.
