The Influence of Well Construction on Groundwater Flow in ... · The Influence of Well Construction...
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The Influence of Well Construction on Groundwater Flow in Columbia River Basalt – Examples from Mosier, Oregon
by
Kenneth E. Lite Jr. Oregon Water Resources Department
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Purpose
• Demonstrate why the geologic framework matters in the Mosier groundwater flow system.
• Show examples of commingling wells.
• Show how commingling wells have affected the Mosier groundwater flow system.
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Geology of the
Columbia River Basalt Group
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Mosier Area
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Surface Geology
B
B’
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Dalles Formation Pomona Selah interbed Priest Rapids Frenchman Springs Grande Ronde
Columbia River Basalt Group
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Dalles Formation
Pomona Basalt
Rosalia Flow: Priest Rapids Basalt
Roza Basalt
Frenchman Springs Basalt
Lolo Flow: Priest Rapids Basalt
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Dalles Formation
Pomona Basalt
Rosalia Flow: Priest Rapids Basalt
Roza Basalt
Frenchman Springs Basalt
Lolo Flow: Priest Rapids Basalt
sandstone lava
lava
claystone lava claystone
claystone
lava
claystone
Potential Aquifers
Potential Aquifers
Potential Aquifer
Potential Aquifers
Hypothetical Well
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Dalles Formation
Pomona Basalt
Rosalia Flow: Priest Rapids Basalt
Roza Basalt
Frenchman Springs Basalt
Lolo Flow: Priest Rapids Basalt
sandstone lava
lava
claystone lava claystone
claystone
lava
claystone
Potential Aquifers
Potential Aquifers
Potential Aquifer
Potential Aquifers
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Rosalia Flow
Quincy – Squaw Creek Interbed
“Lignite”
A. Base of the Priest Rapids Member in a roadcut along I-84, just east of the Memaloose Rest Area.
B. “Lignite” beneath Rosalia (Priest Rapids Member) in Wasc 2075 (441-feet depth).
Example of a “Claystone” Interbed
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Geology and
Commingling Wells
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Water entering the well from a fracture in the rock (Pomona Basalt)
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Water cascading down the borehole wall (near the base of the Priest Rapids Basalt).
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Water moving up the space between the casing and the borehole wall.
Well Casing
Claystone
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Effects of
Commingling Wells
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Composite time series water level data from the Mosier area (from Burns and others, 2012)
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Water Level Trends in the “Priest Rapids” aquifer W
ater
Lev
el E
leva
tion
(met
ers)
Not all wells are affected by commingling
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Wat
er L
evel
Ele
vatio
n (m
eter
s)
Water Level Trends in the “Pomona” aquifer
Not all decline is caused by commingling
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However, commingling does cause:
• Water level decline in many wells • Decreased streamflow in interconnected streams
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Water Level Trends in the Pomona, Priest Rapids, and Frenchman Springs aquifers
Wat
er L
evel
Ele
vatio
n (m
eter
s)
Potential Equilibrium Elevations
New equilibrium elevations at interconnected streams
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Summary • Knowledge of the geologic framework in the Mosier area is
key to identifying potential commingling wells.
• Some commingling wells do exist in the Mosier area.
• Commingling wells are responsible for some of the water-level declines in the Mosier area.
• Stream / Aquifer boundaries have some control on hydraulic head in the Mosier area.
• Commingling wells have contributed to decreases in stream flow.
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Questions??????
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