GSP Annual Report
5-021.66 SOLANO
2025 (OCT. 2024 - SEP. 2025)
Single Annual Report
GSP Annual Report Information Comments
04/01/2026 4:55 PM
2025 (OCT. 2024 - SEP. 2025)
Single Annual Report
A Groundwater Extraction
Total Groundwater Extractions (AF)
198,270
Water Use Sectors
27,190
0
171,080
0
0
0
0
B Groundwater Extraction Methods
Meters
9,180
Direct
90-100 %
SID, City of Rio Vista, City of Dixon and City of Vacaville all are agencies that have metered groundwater wells
Meter model type and calibration accuracy can vary an estimate of 0-5% is considered satisfactory
Electrical Records
0
Land Use
0
Groundwater Model
173,840
Estimate
20-30 %
The Solano Integrated Hydrologic Model (Solano IHM), a gridded numerical groundwater model that characterizes surface water and groundwater
Typical uncertainty associated with water demand estimates using land use, climate, surface water supply and irrigation efficiency data
Other
0
C Surface Water Supply
Total Surface Water Supply (AF)
514,330
Methods Used to Determine
The historical Solano IHM application and inputs used in GSP development were updated and expanded for this Annual Report using available data and information about water supplies and uses since the GSP water budget perriod. Surface Water Use was estimated from the Solano IHM and from the following Data Sources, Solano Project Diversions Reports (diversions into SID distribution system and direct deliveries from Putah South Canal), TruePoint delivery records (deliveries from SID distribution system) and compiled eWRIMS data for water rights users where available; estimated from historical data when data not yet available
Water Source Types
0
2,890
0
504,540
0
6,900
0
0
D Total Water Use
Total Water Use (AF)
712,600
Methods Used to Determine
Total water use was calculated from model estimates and direct meter readings
Water Source Types
198,270
514,330
0
6,900
0
Water Use Sectors
38,910
0
575,130
88,000
0
10,560
0
E Change in Storage
Method used to calculate change in storage
Groundwater storage change was calculated based on the change in groundwater levels between the 2023 and 2024 seasonal high groundwater elevation contours. Seasonal high measurements made in the Winter/Spring provide a more reliable method to calculate change in groundwater storage than measurements made from seasonal low measurements that may be influenced by residual groundwater pumping. The change in groundwater elevation between each seasonal high in consecutive years was multiplied by the specific yield for the Shallow zone and the storativity value for the Deep zone both aquifer storage coefficients were extracted from the model.
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 |
|---|---|---|---|---|
| 5-021.66_PMA_1 | Municipal & Industrial Water Use Efficiency Outreach & Implementation | Solano Subbasin GSA | Ongoing | 1 |
| 5-021.66_PMA_2 | City of Vacaville Recycled Water | City of Vacaville GSA | Planning | 1 |
| 5-021.66_PMA_3 | Westside Streams Stormwater Capture Project | Solano Subbasin GSA | Ongoing | 1 |
| 5-021.66_PMA_4 | Rainfall Managed Aquifer Recharge Demonstration Project | Solano Subbasin GSA | Ongoing | 1 |
| 5-021.66_PMA_5 | Other Groundwater Recharge Opportunities | Solano Subbasin GSA | Ongoing | 1 |
| 5-021.66_PMA_6 | Grower Education Related to On-Farm Practices for Sustainable Groundwater Management | Solano Subbasin GSA | Ongoing | 1 |
| 5-021.66_PMA_7 | Demand Management | Solano Subbasin GSA | Conceptual | 1 |
| 5-021.66_PMA_8 | Groundwater Trading Institution | Solano Subbasin GSA | Conceptual | 1 |
| 5-021.66_PMA_9 | Education and Collaboration | Solano Subbasin GSA | Ongoing | 1 |
| 5-021.66_PMA_10 | Well Owner Outreach and Education | Solano Subbasin GSA | Ongoing | 1 |
| 5-021.66_PMA_11 | Participation in Other Water Resources Management Programs | Solano Subbasin GSA | Ongoing | 1 |
