possible effects of groundwater pumping and artificial ... · groundwater use in recent decades...
TRANSCRIPT
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Possible Effects of Groundwater Pumping and Artificial Recharge on the Verde River and
Tributaries
Stan LeakeU.S. Geological Survey
Tucson, Arizona
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Study Area
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Background The Verde Valley in north-central Arizona has
experienced rapid population growth and increased groundwater use in recent decades
Managers need better information on timing of effects of groundwater pumping and artificial recharge on surface water and evapotranspiration
A new regional model is the best tool available for understanding these effects in the study area
A big-picture understanding of timing of effects could be done by mapping streamflow decrease or increase as a function of well or recharge location, as was done for the San Pedro Basin
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EXAMPLE MAP SHOWING EFFECTS OF PUMPING OR ARTIFICIAL RECHARGE ON SURFACE WATER
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How Groundwater Pumping Can Affect Surface Water
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How Groundwater Pumping Can Affect Surface Water
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Water table
How Groundwater Pumping Can Affect Surface Water
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Water table
How Groundwater Pumping Can Affect Surface Water
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Water table
How Groundwater Pumping Can Affect Surface Water
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How Groundwater Pumping Can Affect Surface Water
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How Groundwater Pumping Can Affect Surface Water
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Sources of Water to a Pumped Well
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Sources of Water to a Pumped Well
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Sources of Water to a Pumped Well
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Sources of Water to a Pumped Well
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Fate of Artificial Recharge
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The timing of effects of pumping depends on •Aquifer properties•Distance to connected SW features
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Change in groundwater storage(falling water table)
Total effect on stream and vegetation, possibly including:- increased inflow from stream- decreased outflow to stream- decreased evapotranspiration
Sources of Water to a Pumped Well
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The timing of effects of recharge depends on •Aquifer properties•Distance to connected SW features
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Change in groundwater storage(rising water table)
Total effect on stream and vegetation, possibly including:- decreased inflow from stream- increased outflow to stream- increased evapotranspiration
Fate of Recharged Water
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1. Hypothetical streamflow not affected by artificial recharge or groundwater pumping
Effects of Artificial Recharge and Groundwater Pumping on a Stream Hydrograph
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2. A nearby artificial recharge project of 3 CFS starts at time = 1 year
Rechargeprojectstarts
Streamflow eventually is increased by 3 CFS
Effects of Artificial Recharge and Groundwater Pumping on a Stream Hydrograph
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3. A nearby groundwater pumping project of 1 CFS starts at time = 4 years
Pumpingprojectstarts
Streamflow eventually is decreased by 1 CFS
Effects of Artificial Recharge and Groundwater Pumping on a Stream Hydrograph
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4. Artificial recharge of 3 CFS begins at time = 1 year and groundwater pumping of 1 CFS begins attime = 4 years
Rechargeprojectstarts
Pumpingprojectstarts
Net streamflow increase is 2 CFS
Effects of Artificial Recharge and Groundwater Pumping on a Stream Hydrograph
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Possible Factors for Mitigation of Streamflow Depletion
1. Artificial recharge of external water or water from within basin that would not have otherwise recharged the aquifer.
2. Capture of previously rejected recharge.
3. Return flow of some of the pumped groundwater.
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How can we compute the timing of depletion from groundwater pumping?
1. Analytical solution• used for regulatory purposes in Colorado and elsewhere• assumes the stream or river is straight• assumes the stream of river fully penetrates the aquifer• does not consider properties of different aquifer layers
2. Groundwater-flow model• used for regulatory purposes in Nebraska and elsewhere• can consider complex river and aquifer geometry• We have the newly developed Northern Arizona Regional
Groundwater Flow Model that includes the Verde Valley sub-basin
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Northern Arizona Regional Groundwater Flow Model
600 rows and 400 columns with 1-km grid spacing
Three model layers representing different aquifer units
Has no artificial boundaries
Model report is “in press” and should be released soon
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HYDROGEOLOGIC UNITS MODEL LAYERS
Flow Model in Study Area—hydrogeologic units
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Flow Model in Study Area—active areas
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Main Products of Study• Report with select results including maps of total
depletion for pumping locations in layers 1 and 2 for pumping times of 10 and 50 years
• A USGS fact sheet that shows main maps with explanations for less technical readers
• “Response functions” that can be used to make other maps or to compute effects of more complicated pumping and recharge scenarios
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What is a response function?
Each transient response function for total depletion consists of depletion percentages for years 1-100. A separate response function exists for each pumping location.
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Application for Verde Watershed—response at 10 years, layer 1
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Application for Verde Watershed—response at 50 years, layer 1
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Application for Verde Watershed—response at 10 years, layer 2
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Application for Verde Watershed—response at 50 years, layer 2
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Application for Verde Watershed—depletion at 50 years, layer 2
Areas where aquifer hydraulic conductivity in the model is the highest
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What is a response function?
Each transient response function for total decrease or increase in streamflow consists of percentages of pumping or recharge rate for years 1-100. A separate response function exists for each location.
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Possible uses of response functionsCalculations of streamflow decrease or increase• for times and locations (i.e. layer 3) not shown in
report
• in select stream segments (transient or steady-state)
• from a well pumping at a variable rate, including intermittent pumping
• from multiple wells pumping at different locations and rates (an alternative to running the model for pumping scenarios)
Note: these applications assume reasonably linear behavior
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Technical Report—
On the internet only athttp://pubs.usgs.gov/sir/2010/5147/
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Fact Sheet—
To be posted on the internet athttp://pubs.usgs.gov/fs/2010/3108/
—will be printed in early 2011