GSP Annual Report
5-022.14 KERN COUNTY
2019 (OCT. 2018 - SEP. 2019)
Single Annual Report
GSP Annual Report Information Comments
04/01/2020 2:38 PM
2019 (OCT. 2018 - SEP. 2019)
Single Annual Report
A Groundwater Extraction
Total Groundwater Extractions (AF)
1,284,183
Water Use Sectors
150,892
0
1,096,779
0
0
0
36,512
Banking Recovery, exchanges and pumpins
B Groundwater Extraction Methods
Meters
169,591
Direct
0-5 %
Meters and comparable measuring devices operated by local water agencies, water purveyors and city water departments in compliance with AWWA and other relevant standards
These data were collected from well meters by experienced water agency staff following monitoring protocols for urban and agricultural water supply. Meters are considered to be well-maintained and tested; therefore, reported data meet high accuracy levels in compliance with AWWA and other relevant standards. In accordance with these standards for water supply, meter accuracy is assumed to range between 0% and 5%.
Electrical Records
0
Land Use
1,114,592
Estimate
10-20 %
IWFM Demand Calculator (IDC) in C2VSimFG-Kern
Estimated groundwater extractions is based on simulation results of the IDC tool within C2VSimFG-Kern model. The water balance accuracy of the groundwater model is considered to be medium, approximately ranging between 10% and 20%. Input data based on metered data is assumed to have an accuracy of 0% to 5%. The agricultural pumping, which is the largest component of groundwater extraction, are estimated using the ITRC-METRIC based ET Rates. ITRC (2020) lists the accuracy of the ET measurements as ranging from 7% to 10%. Land use is based on Kern County Agricultural Commissioner annual land use data including crop type. Soil properties are assumed are based on local soil survey data which have a higher level of uncertainty. Applying a weighted average of these inputs to the overall water budget produces a relative accuracy for the land use calculation for agricultural groundwater extractions ranging between 10% and 20%.
Groundwater Model
0
Other
0
C Surface Water Supply
Total Surface Water Supply (AF)
2,805,400
Methods Used to Determine
Reported data by local water agencies
Water Source Types
505,061
1,121,965
0
1,065,772
75,469
35,609
0
1,524
Tailwater reuse and stormwater recharge
D Total Water Use
Total Water Use (AF)
3,878,302
Methods Used to Determine
Meters, Land Use Calculations, Groundwater Model
Water Source Types
1,284,183
2,768,267
35,609
1,524
0
Water Use Sectors
199,977
0
2,445,679
23,074
1,173,060
0
36,512
Banking recovery, exchanges and pumpins
E Change in Storage
Method used to calculate change in storage
The Kern County Subbasin Coordination Agreement refers to the local groundwater-surface water model (C2VSimFG-Kern) as the agreed upon method for generating coordinated water budgets for the Kern County Subbasin. C2VSimFG-Kern uses comparable data sets and methodologies over the entire Subbasin that meets numerous technical requirements for basin-wide coordination in §357.4. C2VSimFG-Kern is based on the C2VSim Fine Grid Public Beta model (C2VSimFG-Beta) that was released by DWR for SGMA support in May 2018. C2VSimFG-Beta input files were revised to incorporate locally derived managed water supply and demand data to better represent the local water budgets for the Kern County Subbasin. Appendices 2 and 4 of the Kern County Subbasin Coordination Agreement documents the development and application of C2VSimFG-Kern for GSP purposes. For the 2019 Annual Report model update, new data for WYs 2016 through 2019 were requested and provided by the local agencies through their respective GSA. Monthly data for surface water, recharge operations, measured groundwater pumping, stream inflows and other locally important conditions were updated. In addition, regional data sets for precipitation and evapotranspiration were also updated to provide climatic data sets for the C2VSimFG-Kern update. These data were added to the existing C2VSimFG-Kern data structure and model input files following the same procedures used for model development presented in the Kern County Subbasin GSPs and Coordination Agreement. In addition, new recovery wells and recharge operations that became operational during the update period were added to the model input. The change is the sum of the total change in groundwater in storage for each element and model layer in the Kern County Subbasin for WY 2019.
F Monitoring Network Module
G PMA Module
PMA Implementation Updates Implementation Update Export (CSV) PMA Export (CSV)
PMA ID | PMA Name | Lead GSA | Status | # Updates during WY |
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