WWDC Green River Basin Plan II, Groundwater Study (Level I) WSGS USGS WRDS October 23, 2008 Green River Basin (GRB) Basin Advisory Group

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WWDC Green River Basin Plan II, Groundwater Study (Level I) WSGS USGS WRDS 2007-20092009 October 23, 2008 Green River Basin (GRB) Basin Advisory Group (BAG)

1 WWDC Green River Basin Plan II, Groundwater Study (Level I) WSGS USGS WRDS October 23, 2008 Green River Basin (GRB) Basin Advisory Group (BAG) Western Wyoming Community College, Rock Springs, Wyoming Keith E. Clarey, P.G. Senior Geohydrologist Wyoming State Geological Survey (WSGS) Laramie, Wyoming

2 Introduction Green River Basin (GRB) Plan II, Groundwater Study (Level I) Commenced in June 2007 Draft Project Report October 2008 Final Project Report - December 1, 2008

3 Introduction (cont d) Cooperative Water Study Wyoming Water Development Commission (WWDC) Wyoming Water Development Office (WWDO) Wyoming State Geological Survey (WSGS) U.S. Geological Survey (USGS) Water Resources Data System (WRDS) Surface Water Consultant WWC Engineering, Laramie Other interested parties including GRB BAG

4 GRB Groundwater Study Team WWDO Project Manager Chace Tavelli WSGS Laramie Laramie Keith Clarey USGS Cheyenne Tim Bartos WRDS University of Wyoming Steve Gray

6 GRB Groundwater Study Identify & inventory the aquifers within the drainage basin area Determine 3-dimensional configuration of the aquifers (outcrop areas, geologic structures, & depths) Estimate aquifer recharge rates, storage quantities, & discharge rates

7 GRB Groundwater Study (cont d) Identify areas with interaction between groundwater & surface water Assess the quantity & quality of groundwater available in the aquifers Investigate the usage of groundwater in the basin

8 Geologic Setting of the GRB Complex structural lb basin with hf folds, faults, & uplifts Deepest depth in the basin exceeds 35,000 feet Central basin areas are like a layer cake of bedrock GRB formations from Precambrian to Quaternary in age (170 geologic units) Wyoming 105 GIS geologic units Colorado 40 GIS geologic units Utah 25 GIS geologic units

10 GRB - Stratigraphic Column from: WSGS CRS-2 (1973) and WSGS MS-41 (1993)

15 Percentages of GRB Map Area Cenozoic Aquifer System 83% WY 80% WY-CO CO-UT Mesozoic Aquifer System 12% WY 11% WY-CO CO-UT Paleozoic Aquifer System 1% WY 1% WY-CO CO-UT Precambrian Aquifer System 4% WY 7% WY-CO CO-UT

17 Wyoming GRB Wells and Springs There are 13,002 groundwater permits on file with the WSEO as of December 2007 and most of these permits are for wells in the Wyoming GRB There are 1,202 USGS mapped springs in the Wyoming GRB

36 Aquifer Recharge & Discharge Recharge to Aquifers Infiltration from precipitation & snowmelt Seepage from streams, ponds, lakes, reservoirs, & rivers Infiltration of irrigation water Discharge from Aquifers Evapotranspiration Discharge from springs Discharge to streams & rivers Subsurface leakage from an aquifer to adjacent aquifers Pumpage from water & coal bed natural gas (CBNG) wells Estimates of Recharge & Discharge Rates Rates range from less than 1 inch to 12 inches per year in the GRB.

37 Aquifer Storage Very little is known about water storage in the aquifers. Estimates of aquifer storage were made based on a set of assumptions about aquifer properties. Estimates of storage incorporate volume calculations based on areal extent and thickness of the aquifer.

39 Wasatch Aquifer Potentiometric Map

40 Wasatch Aquifer Total Dissolved Solids Map

41 Summary The WSGS-USGS USGS-WRDS team is completing the groundwater study for the updated Green River Basin Plan II (2009). Aquifers in the GRB have been inventoried and characterized for quantity and quality of groundwater and hydrogeologic properties.

42 Summary (cont d) The groundwater team is coordinating activities with the surface water team (WWC Engineering and others). The updated groundwater study for the GRB Plan II is currently a draft report. The final groundwater report is due out in December 2008.

43 Thank you, Questions? Keith E. Clarey (307) , x241

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