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GroMoPo Metadata for Quincy Basin USGS model

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Created: Feb 07, 2023 at 7:12 p.m.
Last updated: Feb 07, 2023 at 7:12 p.m.
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The Miocene Columbia River Basalt Group and younger sedimentary deposits of lacustrine, fluvial, eolian, and cataclysmic-flood origins compose the aquifer system of the Quincy Basin in eastern Washington. Irrigation return flow and canal leakage from the Columbia Basin Project have caused groundwater levels to rise substantially in some areas. Water resource managers are considering extraction of additional stored groundwater to supply increasing demand. To help address these concerns, the transient groundwater model of the Quincy Basin documented in this report was developed to quantify the changes in groundwater flow and storage. The model based on the U.S. Geological Survey modular three-dimensional finite-difference numerical code MODFLOW uses a 1-kilometer finite-difference grid and is constrained by logs from 698 wells in the study area. Five model layers represent two sedimentary hydrogeologic units and underlying basalt formations. Head-dependent flux boundaries represent the Columbia River and other streams, lakes and reservoirs, underflow to and (or) from adjacent areas, and discharge to agricultural drains and springs. Specified flux boundaries represent recharge from precipitation and anthropogenic sources, including irrigation return flow and leakage from water-distribution canals and discharge through groundwater withdrawal wells. Transient conditions were simulated from 1920 to 2013 using annual stress periods. The model was calibrated with the parameter-estimation code PEST to a total of 4,064 water levels measured in 710 wells. Increased recharge since predevelopment resulted in an 11.5 million acre-feet increase in storage in the Quincy Groundwater Management Subarea of the Quincy Basin. Four groundwater-management scenarios were formulated with input from project stakeholders and were simulated using the calibrated model to provide representative examples of how the model could be used to evaluate the effect on groundwater levels as a result of potential changes in recharge, groundwater withdrawals, or increased flow in Crab Creek. Decreased recharge and increased groundwater withdrawals both resulted in declines in groundwater levels over 2013 conditions, whereas increasing the flow in Crab Creek resulted in increased groundwater levels over 2013 conditions.

Subject Keywords



Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
United States
North Latitude
East Longitude
South Latitude
West Longitude


Additional Metadata

Name Value
DOI 10.3133/sir20185162
Scale 101 - 1 000 km²
Layers 2-5 layers
Purpose Groundwater resources
GroMoPo_ID 95
IsVerified True
Model Code MODFLOW
Model Link
Model Time 1920-2013
Model Year 2018
Model Authors L. Frans
Model Country United States
Data Available Input and output publicly available
Developer Email
Dominant Geology Unconsolidated sediments
Developer Country USA
Publication Title Simulation of Groundwater Storage Changes in the Quincy Basin, Washington
Original Developer No
Additional Information This model was developed to examine groundwater storage changes in the Quincy Basin, Washington from 1920 to 2013
Integration or Coupling None of the above
Evaluation or Calibration Static water levels
Geologic Data Availability

How to Cite

GroMoPo, T. L. Watson (2023). GroMoPo Metadata for Quincy Basin USGS model, HydroShare,

This resource is shared under the Creative Commons Attribution CC BY.


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