GSP Annual Report
5-021.52 COLUSA
2024 (OCT. 2023 - SEP. 2024)
Single Annual Report
GSP Annual Report Information
Correspondences
Comments
04/01/2025 3:15 PM
2024 (OCT. 2023 - SEP. 2024)
Single Annual Report
A Groundwater Extraction
Total Groundwater Extractions (AF)
562,100
Water Use Sectors
11,000
0
535,000
16,100
0
0
0
B Groundwater Extraction Methods
Meters
8,180
Direct
5-10 %
Flowmeter records of groundwater extraction for urban use from cities and for agricultural use from the Colusa Well Monitoring Pilot Program.
Estimated based on the typical field accuracy of meters, and the typical combined accuracy of volumes in urban distribution systems (accounting for metered groundwater, metered deliveries, unmetered deliveries, and apparent losses)
Electrical Records
0
Land Use
547,200
Estimate
20-30 %
Estimated from a water use analysis based on land use, ET, available surface water supplies, and ponding water use requirements (where applicable).
Typical uncertainty of a water use analysis approach, considering the combined uncertainty of other flow paths following the procedure described by Clemmens and Burt (1997). The uncertainties of other flow paths are quantified based on measurement device accuracy, technical literature, or professional judgment.
Groundwater Model
0
Other
6,720
Estimate
20-30 %
Estimated in urban and rural areas where flowmeter records were unavailable based on annual population data, monthly per capita water use requirements, and outdoor use information. Total rounded to match rounded total groundwater extraction (Part A).
Typical uncertainty when calculated from population, per capita water use, and outdoor use assumptions, considering the combined uncertainty of those data sources.
C Surface Water Supply
Total Surface Water Supply (AF)
1,543,500
Methods Used to Determine
CVP supply and local supply (Orland Project) surface water deliveries were summarized from USBR CVO reports and Tehama Colusa Canal Authority delivery reports (where applicable). CVP supplies available to managed wetlands were summarized from CVPIA Refuge Water Supply Program contract quantities and reported annual allocations to National Wildlife Refuges in the Colusa Subbasin.
Water Source Types
1,502,100
0
0
41,400
0
0
0
0
D Total Water Use
Total Water Use (AF)
2,105,600
Methods Used to Determine
Groundwater is determined following the methods described in Part B. Surface water is determined following the methods described in Part C. Totals are rounded.
Water Source Types
562,100
1,543,500
0
0
0
Water Use Sectors
11,000
0
1,953,100
108,500
33,000
0
0
E Change in Storage
Method used to calculate change in storage
Annual change in groundwater storage was calculated based on change in measured spring-to-spring groundwater elevations multiplied by the area of the Thiessen polygon associated with each groundwater level RMS well and a refined storage coefficient of approximately 0.063 (revised in the WY 2023 Annual Report to align the average change in groundwater storage from the 1990-2015 period to the average results from the C2VSimFG-Colusa model used in the GSP; earlier values have changed following the inclusion of this updated storage coefficient). Change in groundwater storage in WY 2024 represents the Spring 2023-Spring 2024 annual change in groundwater storage.
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 |
|---|---|---|---|---|
| 5-021.52_PMA_1 | Colusa County Water District (CCWD) In-Lieu Groundwater Recharge | Colusa Groundwater Authority GSA - Colusa | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_2 | Colusa Drain MWC (CDMWC) In-Lieu Groundwater Recharge | Colusa Groundwater Authority GSA - Colusa | Planning (Status Unchanged) | 1 |
| 5-021.52_PMA_3 | Subbasin Multi-Benefit Groundwater Recharge | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | Completed - Benefits Fully Realized (Status Unchanged) | 1 |
| 5-021.52_PMA_5 | Sycamore Slough Groundwater Recharge Pilot Project | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_6 | Demand Management Program | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_7 | Domestic Well Mitigation Program | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_8 | Reclamation District 108 (RD108) and Colusa County Water District (CCWD) Agreement for Five-Year In-Lieu Groundwater Recharge Project | Colusa Groundwater Authority GSA - Colusa | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_9 | Glenn-Colusa Irrigation District (GCID) Strategic Winter Water Use for Groundwater Recharge and Multiple Benefits | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_10 | Sycamore Marsh Farm Direct Recharge Project | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_11 | Glenn-Colusa Irrigation District Expansion of In-Basin Program for In-lieu Groundwater Recharge | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_13 | Tehama-Colusa Canal Trickle Flow to Ephemeral Streams | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_15 | Urban Water Conservation in Willows | Colusa Groundwater Authority GSA - Colusa | Completed - Accruing Benefits (Status Unchanged) | 1 |
| 5-021.52_PMA_16 | Glenn-Colusa Irrigation District In-lieu Groundwater Recharge | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_17 | Westside Streams Diversion for Direct or In-lieu Groundwater Recharge | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_18 | Sites Reservoir | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_19 | Delevan Pipeline Colusa Drain Intertie | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_22 | Sycamore Slough Colusa Basin Drain Multi-Benefit Recharge Project | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_23 | Enhanced Infiltration of Precipitation on Agricultural Lands | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_24 | Colusa Subbasin Flood-MAR | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_25 | Reclamation District 108 "Boards In" Program | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_26 | Spring Valley Recharge Project ? Phase 1 | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_27 | Sycamore Slough Reconnection and Recharge | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_28 | Glenn-Colusa Irrigation District Recharge Basin | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_29 | Colusa County Public Water System Water Treatment Plant | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_30 | Glenn-Colusa Irrigation District Water Transfers to TCCA CVP Contractors | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_31 | Colusa Subbasin In-Lieu Recharge & Banking Program | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_32 | Sycamore Marsh Farm In-Lieu Recharge Project | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_33 | Westside Off-stream Reservoir and In-Lieu Groundwater Recharge | Colusa Groundwater Authority GSA - Colusa, Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_34 | Drought Contingency Planning for Urban Areas | Glenn Groundwater Authority GSA, Colusa Groundwater Authority GSA - Colusa | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_35 | Well Abandonment Outreach and Funding Program | Glenn Groundwater Authority GSA, Colusa Groundwater Authority GSA - Colusa | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_36 | Preservation of Lands Favorable for Recharge | Glenn Groundwater Authority GSA, Colusa Groundwater Authority GSA - Colusa | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_37 | Review of County Well Permitting Ordinances | Glenn Groundwater Authority GSA, Colusa Groundwater Authority GSA - Colusa | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_38 | Reduce Non-beneficial Evapotranspiration | Glenn Groundwater Authority GSA, Colusa Groundwater Authority GSA - Colusa | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_39 | Development of a Dedicated Network of Shallow Monitoring Wells for GDE Monitoring | Glenn Groundwater Authority GSA, Colusa Groundwater Authority GSA - Colusa | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_4 | Orland-Artois Water District (OAWD) Land Annexation and In-Lieu Groundwater Recharge | Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_12 | Orland Unit Water Users Association (OUWUA) Irrigation Modernization for Increased Surface Water Delivery and Reduced Groundwater Pumping | Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_14 | Glenn Groundwater Authority Recharge Project | Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
| 5-021.52_PMA_20 | Orland Unit Water Users Association Flood Water Conveyance | Glenn Groundwater Authority GSA | No Update (Status Unchanged) | 1 |
| 5-021.52_PMA_21 | Orland-Artois Water District Direct Groundwater Recharge | Glenn Groundwater Authority GSA | Ongoing (Status Unchanged) | 1 |
