GSP Annual Report
5-022.13 TULE
2020 (OCT. 2019 - SEP. 2020)
Multiple Annual Reports
GSP Local ID: LTRID GSA
GSP Annual Report Information Comments
A Groundwater Extraction
Total Groundwater Extractions (AF)
240,900
Water Use Sectors
890
0
226,000
0
0
0
0
B Groundwater Extraction Methods
Meters
14,990
Direct
80-90 %
Woodville Public Utility District, Tipton Community Service District, Poplar Community Service District, and Boswell production well meters
Routinely maintained and calibrated by the Woodville Public Utility District, Tipton Community Service District, Poplar Community Service District, and Boswell
Electrical Records
0
Land Use
0
Groundwater Model
0
Other
226,000
Estimate
70-80 %
Back calculated from remotely sensed satellite ETc data and irrigation efficiency estimates base on CDWR land use maps or field surveys
ETc data been proven to have approximately 90% accurrate based on pilot studies performed within the LTRID. Irrigation efficiencies are subject to error being it is derived from outdated 2016 CDWR land use data and correlated to common irrigations methods for any given crop.
C Surface Water Supply
Total Surface Water Supply (AF)
152,900
Methods Used to Determine
Imported CVP - metered. Local Supplies- Flow meters at district diversion points. Precipitation - CIMIS weather stations and Groundwater Flow Model estimates on effective precipitation.
Water Source Types
71,200
0
0
0
25,200
0
0
56,500
Effective Preciptation
D Total Water Use
Total Water Use (AF)
393,790
Methods Used to Determine
Groundwater- ETc & Meters. Surfacewater - Meters. Urban - metered. Recharged- metered
Water Source Types
240,990
96,400
0
0
56,500
Effective Precipitation
Water Use Sectors
26,800
0
197,000
0
26,000
0
0
E Change in Storage
Method used to calculate change in storage
uses Geographic Information System (GIS) mapping to spatially quantify gross groundwater storage volume as a function of specific yield and based, in part, on comparison of spring 2019 and spring 2020 groundwater contour maps developed from different data sets. A more limited set of wells with groundwater elevation data was available for the Fall 2019 contour map relative to the Fall 2020 map. The magnitude of the estimate of storage change should be evaluated in the context of the uncertainty in these data sets. As consistent monitoring data will be available year to year in the future, it is anticipated that a more representative and, thus, more accurate storage change estimates will be available in future reports.
