John P Hoffmann (Former Employee)
Science and Products
Estimated infiltration, percolation, and recharge rates at the Rillito Creek focused recharge investigation site, Pima County, Arizona Estimated infiltration, percolation, and recharge rates at the Rillito Creek focused recharge investigation site, Pima County, Arizona
A large fraction of ground water stored in the alluvial aquifers in the Southwest is recharged by water that percolates through ephemeral stream-channel deposits. The amount of water currently recharging many of these aquifers is insufficient to meet current and future demands. Improving the understanding of streambed infiltration and the subsequent redistribution of water within the...
Authors
John P. Hoffmann, Kyle W. Blasch, Don R. Pool, Matthew A. Bailey, James B. Callegary
Ground-water recharge in the arid and semiarid southwestern United States Ground-water recharge in the arid and semiarid southwestern United States
Ground-water recharge in the arid and semiarid southwestern United States results from the complex interplay of climate, geology, and vegetation across widely ranging spatial and temporal scales. Present-day recharge tends to be narrowly focused in time and space. Widespread water-table declines accompanied agricultural development during the twentieth century, demonstrating that...
Hydrogeology of the upper and middle Verde River watersheds, central Arizona Hydrogeology of the upper and middle Verde River watersheds, central Arizona
The upper and middle Verde River watersheds in central Arizona are primarily in Yavapai County, which in 1999 was determined to be the fastest growing rural county in the United States; by 2050 the population is projected to more than double its current size (132,000 in 2000). This study combines climatic, surface-water, ground-water, water-chemistry, and geologic data to describe the
Authors
Kyle W. Blasch, John P. Hoffmann, Leslie F. Graser, Jeannie R. Bryson, Alan L. Flint
Simulated water-level responses, ground-water fluxes, and storage changes for recharge scenarios along Rillito Creek, Tucson, Arizona Simulated water-level responses, ground-water fluxes, and storage changes for recharge scenarios along Rillito Creek, Tucson, Arizona
A local ground-water flow model is used to simulate four recharge scenarios along Rillito Creek in northern Tucson to evaluate mitigating effects on ground-water deficits and water-level declines in Tucson's Central Well Field. The local model, which derives boundary conditions from a basin-scale model, spans the 12-mile reach of Rillito Creek and extends 9 miles south into the Central...
Authors
John P. Hoffmann, Stanley A. Leake
Geologic, hydrologic, and chemical data from the C aquifer near Leupp, Arizona Geologic, hydrologic, and chemical data from the C aquifer near Leupp, Arizona
No abstract available.
Authors
J.P. Hoffmann, D. J. Bills, J. V. Phillips, K. J. Halford
Numerical ground-water change model of the C aquifer and effects of ground-water withdrawals on stream depletion in selected reaches of Clear Creek, Chevelon Creek, and the Little Colorado River, northeastern Arizona Numerical ground-water change model of the C aquifer and effects of ground-water withdrawals on stream depletion in selected reaches of Clear Creek, Chevelon Creek, and the Little Colorado River, northeastern Arizona
No abstract available.
Authors
S. A. Leake, J.P. Hoffmann, Jesse E. Dickinson
Science and Products
Estimated infiltration, percolation, and recharge rates at the Rillito Creek focused recharge investigation site, Pima County, Arizona Estimated infiltration, percolation, and recharge rates at the Rillito Creek focused recharge investigation site, Pima County, Arizona
A large fraction of ground water stored in the alluvial aquifers in the Southwest is recharged by water that percolates through ephemeral stream-channel deposits. The amount of water currently recharging many of these aquifers is insufficient to meet current and future demands. Improving the understanding of streambed infiltration and the subsequent redistribution of water within the...
Authors
John P. Hoffmann, Kyle W. Blasch, Don R. Pool, Matthew A. Bailey, James B. Callegary
Ground-water recharge in the arid and semiarid southwestern United States Ground-water recharge in the arid and semiarid southwestern United States
Ground-water recharge in the arid and semiarid southwestern United States results from the complex interplay of climate, geology, and vegetation across widely ranging spatial and temporal scales. Present-day recharge tends to be narrowly focused in time and space. Widespread water-table declines accompanied agricultural development during the twentieth century, demonstrating that...
Hydrogeology of the upper and middle Verde River watersheds, central Arizona Hydrogeology of the upper and middle Verde River watersheds, central Arizona
The upper and middle Verde River watersheds in central Arizona are primarily in Yavapai County, which in 1999 was determined to be the fastest growing rural county in the United States; by 2050 the population is projected to more than double its current size (132,000 in 2000). This study combines climatic, surface-water, ground-water, water-chemistry, and geologic data to describe the
Authors
Kyle W. Blasch, John P. Hoffmann, Leslie F. Graser, Jeannie R. Bryson, Alan L. Flint
Simulated water-level responses, ground-water fluxes, and storage changes for recharge scenarios along Rillito Creek, Tucson, Arizona Simulated water-level responses, ground-water fluxes, and storage changes for recharge scenarios along Rillito Creek, Tucson, Arizona
A local ground-water flow model is used to simulate four recharge scenarios along Rillito Creek in northern Tucson to evaluate mitigating effects on ground-water deficits and water-level declines in Tucson's Central Well Field. The local model, which derives boundary conditions from a basin-scale model, spans the 12-mile reach of Rillito Creek and extends 9 miles south into the Central...
Authors
John P. Hoffmann, Stanley A. Leake
Geologic, hydrologic, and chemical data from the C aquifer near Leupp, Arizona Geologic, hydrologic, and chemical data from the C aquifer near Leupp, Arizona
No abstract available.
Authors
J.P. Hoffmann, D. J. Bills, J. V. Phillips, K. J. Halford
Numerical ground-water change model of the C aquifer and effects of ground-water withdrawals on stream depletion in selected reaches of Clear Creek, Chevelon Creek, and the Little Colorado River, northeastern Arizona Numerical ground-water change model of the C aquifer and effects of ground-water withdrawals on stream depletion in selected reaches of Clear Creek, Chevelon Creek, and the Little Colorado River, northeastern Arizona
No abstract available.
Authors
S. A. Leake, J.P. Hoffmann, Jesse E. Dickinson