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Elizabeth Ahearn (Former Employee)

Science and Products

Mill River at Northampton, Massachusetts

Regional Regression Equations for Estimating Selected Low-flow Statistics at Ungaged Stream Sites in Massachusetts

The U.S. Geological Survey, in cooperation with the Massachusetts Department of Recreation and Conservation, Office of Water Resources, began a study in 2019 to update the regional regression equations for estimating selected low-flow statistics at ungaged sites in Massachusetts.
By
New England Water Science Center
Regional Regression Equations for Estimating Selected Low-flow Statistics at Ungaged Stream Sites in Massachusetts

Regional Regression Equations for Estimating Selected Low-flow Statistics at Ungaged Stream Sites in Massachusetts

The U.S. Geological Survey, in cooperation with the Massachusetts Department of Recreation and Conservation, Office of Water Resources, began a study in 2019 to update the regional regression equations for estimating selected low-flow statistics at ungaged sites in Massachusetts.
Learn More
Installing real-time equipment onto a groundwater well

Developing Synthetic Historical Record at Groundwater Wells Using Record Extension Techniques

The Groundwater Index in the Massachusetts Drought Management Plan provides a general overview of groundwater levels relative to long-term groundwater levels in Massachusetts. The methods used to compute the Groundwater Index were revised for the 2019 version of the Drought Management Plan. The 2019 plan aligns the drought categories and specifies the drought status from select percentile ranges...
By
New England Water Science Center
Developing Synthetic Historical Record at Groundwater Wells Using Record Extension Techniques

Developing Synthetic Historical Record at Groundwater Wells Using Record Extension Techniques

The Groundwater Index in the Massachusetts Drought Management Plan provides a general overview of groundwater levels relative to long-term groundwater levels in Massachusetts. The methods used to compute the Groundwater Index were revised for the 2019 version of the Drought Management Plan. The 2019 plan aligns the drought categories and specifies the drought status from select percentile ranges...
Learn More
Screenshot of the Flood Insurance Map

Development of Flood Insurance Maps in New England

FEMA has requested USGS expertise in hydraulics, hydrology, and mapping to generate flood insurance maps for New England.
By
New England Water Science Center
Development of Flood Insurance Maps in New England

Development of Flood Insurance Maps in New England

FEMA has requested USGS expertise in hydraulics, hydrology, and mapping to generate flood insurance maps for New England.
Learn More
Flooding in Soldier Pond, Maine

Development of Regional Regression Equations in Connecticut

Knowledge of the magnitude and frequency of floods is needed for the effective and safe design of bridges, culverts, and other structures. This information is also important for flood-plain planning and management. Periodic examination of flood-frequency characteristics is essential to ensure the best estimates of flood magnitudes for a given annual exceedance probabilities (AEP).
By
New England Water Science Center
Development of Regional Regression Equations in Connecticut

Development of Regional Regression Equations in Connecticut

Knowledge of the magnitude and frequency of floods is needed for the effective and safe design of bridges, culverts, and other structures. This information is also important for flood-plain planning and management. Periodic examination of flood-frequency characteristics is essential to ensure the best estimates of flood magnitudes for a given annual exceedance probabilities (AEP).
Learn More

Data and R Code to Derive Estimates of Groundwater Levels Using MOVE.1 Regression and Compute Monthly Percentiles for Select Wells in Massachusetts Data and R Code to Derive Estimates of Groundwater Levels Using MOVE.1 Regression and Compute Monthly Percentiles for Select Wells in Massachusetts

This data release contains extended estimates of daily groundwater levels and monthly percentiles at 27 short-term monitoring wells in Massachusetts. The Maintenance of Variance Extension Type 1 (MOVE.1) regression method was used to extend short-term groundwater levels at wells with less than 10 years of continuous data. This method uses groundwater level data from a correlated long...
By
New England Water Science Center
Filter Total Items: 19

Methods for estimating selected low-flow statistics at gaged and ungaged stream sites in Massachusetts Methods for estimating selected low-flow statistics at gaged and ungaged stream sites in Massachusetts

The U.S. Geological Survey, in cooperation with the Massachusetts Department of Conservation and Recreation, Office of Water Resources, computed selected at-site streamflow statistics at U.S. Geological Survey streamgages in and near Massachusetts and developed regional regression equations for estimating selected streamflows at ungaged stream sites in Massachusetts. Two sets of regional...
Authors
Gardner C. Bent, Elizabeth Ahearn, Jennifer Fair
By
New England Water Science Center

Development of regression equations to estimate flow durations, low-flow frequencies, and mean flows at ungaged stream sites in Connecticut using data through water year 2022 Development of regression equations to estimate flow durations, low-flow frequencies, and mean flows at ungaged stream sites in Connecticut using data through water year 2022

To aid Federal and State regulatory agencies in the effective management of water resources, the U.S. Geological Survey, in cooperation with the Connecticut Department of Energy and Environmental Protection and the Connecticut Department of Transportation, updated flow statistics for 118 streamgages and developed 47 regression equations to estimate selected flow duration, low flow, and...
Authors
Elizabeth Ahearn, Gardner C. Bent
By
New England Water Science Center

Flood of July 2023 in Vermont Flood of July 2023 in Vermont

A major storm caused catastrophic flooding in many parts of Vermont on July 9–12, 2023, resulting in millions of dollars in damages. The high amount of rainfall caused several rivers to peak at record levels, in some cases exceeding records set during Tropical Storm Irene in 2011. The U.S. Geological Survey, in cooperation with the Federal Emergency Management Agency, collected and...
Authors
Travis Smith, Scott A. Olson, James LeNoir, Rena Kalmon, Elizabeth Ahearn
By
New England Water Science Center

Estimating groundwater level records using MOVE.1 and computing monthly percentiles from estimated groundwater records in Massachusetts Estimating groundwater level records using MOVE.1 and computing monthly percentiles from estimated groundwater records in Massachusetts

The U.S. Geological Survey, in cooperation with the Massachusetts Department of Environmental Protection, performed record extensions on groundwater levels at select wells using the Maintenance of Variance Extension type 1 (MOVE.1) method. The groundwater levels estimated from these record extensions were used to compute monthly percentiles to improve future determinations of a...
Authors
Elizabeth Ahearn, Dee-Ann Crozier
By
Water Resources Mission Area, New England Water Science Center

Estimating flood magnitude and frequency on streams and rivers in Connecticut, based on data through water year 2015 Estimating flood magnitude and frequency on streams and rivers in Connecticut, based on data through water year 2015

The U.S. Geological Survey, in cooperation with the Connecticut Department of Transportation, updated flood-frequency estimates with 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities (2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year recurrence intervals, respectively) for 141 streamgages in Connecticut and 11 streamgages in adjacent States using annual peak...
Authors
Elizabeth Ahearn, Glenn Hodgkins
By
Water Resources Mission Area, New England Water Science Center, StreamStats

Methods for estimating regional coefficient of skewness for unregulated streams in New England, based on data through water year 2011 Methods for estimating regional coefficient of skewness for unregulated streams in New England, based on data through water year 2011

The magnitude of annual exceedance probability floods is greatly affected by the coefficient of skewness (skew) of the annual peak flows at a streamgage. Standard flood frequency methods recommend weighting the station skew with a regional skew to better represent regional and stable conditions. This study presents an updated analysis of a regional skew for New England developed using a...
Authors
Andrea Veilleux, Phillip Zarriello, Glenn Hodgkins, Elizabeth Ahearn, Scott A. Olson, Timothy Cohn
By
Water Resources Mission Area

Flood inundation maps and water-surface profiles for tropical storm Irene and selected annual exceedance probability floods for Flint Brook and the Third Branch White River in Roxbury, Vermont Flood inundation maps and water-surface profiles for tropical storm Irene and selected annual exceedance probability floods for Flint Brook and the Third Branch White River in Roxbury, Vermont

Flint Brook, a tributary to the Third Branch White River in Roxbury, Vermont, has a history of flooding the Vermont Fish and Wildlife Department’s Roxbury Fish Culture Station (the hatchery) and surrounding infrastructure. Flooding resulting from tropical storm Irene on August 28–29, 2011, caused widespread destruction in the region, including extensive and costly damages to the State...
Authors
Elizabeth Ahearn, Pamela J. Lombard
By
New England Water Science Center

Nutrient concentrations and loads in the northeastern United States - Status and trends, 1975-2003 Nutrient concentrations and loads in the northeastern United States - Status and trends, 1975-2003

The U.S. Geological Survey (USGS) National Water-Quality Assessment Program (NAWQA) began regional studies in 2003 to synthesize information on nutrient concentrations, trends, stream loads, and sources. In the northeastern United States, a study area that extends from Maine to central Virginia, nutrient data were evaluated for 130 USGS water-quality monitoring stations. Nutrient data...
Authors
Elaine Trench, Richard Moore, Elizabeth Ahearn, John Mullaney, R. Hickman, Gregory E. Schwarz
By
New England Water Science Center, USGS Science in Long Island Sound and its Watershed

Magnitude of flood flows for selected annual exceedance probabilities in Rhode Island through 2010 Magnitude of flood flows for selected annual exceedance probabilities in Rhode Island through 2010

Heavy persistent rains from late February through March 2010 caused severe widespread flooding in Rhode Island that set or nearly set record flows and water levels at many long-term streamgages in the State. In response, the U.S. Geological Survey, in partnership with the Federal Emergency Management Agency, conducted a study to update estimates of flood magnitudes at streamgages and...
Authors
Phillip Zarriello, Elizabeth Ahearn, Sara Levin
By
New England Water Science Center, StreamStats

USGS library for S-PLUS for Windows -- Release 4.0 USGS library for S-PLUS for Windows -- Release 4.0

Release 4.0 of the U.S. Geological Survey S-PLUS library supercedes release 2.1. It comprises functions, dialogs, and datasets used in the U.S. Geological Survey for the analysis of water-resources data. This version does not contain ESTREND, which was in version 2.1. See Release 2.1 for information and access to that version. This library requires Release 8.1 or later of S-PLUS for...
Authors
David Lorenz, Elizabeth Ahearn, Janet Carter, Timothy A. Cohn, Wendy Danchuk, Jeffrey Frey, Dennis R. Helsel, Kathy Lee, David Leeth, Jeffrey Martin, Virginia McGuire, Kathleen Neitzert, Dale Robertson, James Slack, J. Jeffrey Starn, Aldo Vecchia, Donald Wilkison, Joyce E. Williamson
By
Water Resources Mission Area, Upper Midwest Environmental Sciences Center, Upper Midwest Water Science Center

Connecticut Highlands technical report— Documentation of the regional rainfall-runoff model Connecticut Highlands technical report— Documentation of the regional rainfall-runoff model

This report provides the supporting data and describes the data sources, methodologies, and assumptions used in the assessment of existing and potential water resources of the Highlands of Connecticut and Pennsylvania (referred to herein as the “Highlands”). Included in this report are Highlands groundwater and surface-water use data and the methods of data compilation. Annual mean...
Authors
Elizabeth Ahearn, David Bjerklie
By
New England Water Science Center

Regional Regression Equations to Estimate Flow-Duration Statistics at Ungaged Stream Sites in Connecticut Regional Regression Equations to Estimate Flow-Duration Statistics at Ungaged Stream Sites in Connecticut

Multiple linear regression equations for determining flow-duration statistics were developed to estimate select flow exceedances ranging from 25- to 99-percent for six 'bioperiods'-Salmonid Spawning (November), Overwinter (December-February), Habitat Forming (March-April), Clupeid Spawning (May), Resident Spawning (June), and Rearing and Growth (July-October)-in Connecticut. Regression...
Authors
Elizabeth Ahearn
By
New England Water Science Center

Science and Products

Mill River at Northampton, Massachusetts

Regional Regression Equations for Estimating Selected Low-flow Statistics at Ungaged Stream Sites in Massachusetts

The U.S. Geological Survey, in cooperation with the Massachusetts Department of Recreation and Conservation, Office of Water Resources, began a study in 2019 to update the regional regression equations for estimating selected low-flow statistics at ungaged sites in Massachusetts.
By
New England Water Science Center
Regional Regression Equations for Estimating Selected Low-flow Statistics at Ungaged Stream Sites in Massachusetts

Regional Regression Equations for Estimating Selected Low-flow Statistics at Ungaged Stream Sites in Massachusetts

The U.S. Geological Survey, in cooperation with the Massachusetts Department of Recreation and Conservation, Office of Water Resources, began a study in 2019 to update the regional regression equations for estimating selected low-flow statistics at ungaged sites in Massachusetts.
Learn More
Installing real-time equipment onto a groundwater well

Developing Synthetic Historical Record at Groundwater Wells Using Record Extension Techniques

The Groundwater Index in the Massachusetts Drought Management Plan provides a general overview of groundwater levels relative to long-term groundwater levels in Massachusetts. The methods used to compute the Groundwater Index were revised for the 2019 version of the Drought Management Plan. The 2019 plan aligns the drought categories and specifies the drought status from select percentile ranges...
By
New England Water Science Center
Developing Synthetic Historical Record at Groundwater Wells Using Record Extension Techniques

Developing Synthetic Historical Record at Groundwater Wells Using Record Extension Techniques

The Groundwater Index in the Massachusetts Drought Management Plan provides a general overview of groundwater levels relative to long-term groundwater levels in Massachusetts. The methods used to compute the Groundwater Index were revised for the 2019 version of the Drought Management Plan. The 2019 plan aligns the drought categories and specifies the drought status from select percentile ranges...
Learn More
Screenshot of the Flood Insurance Map

Development of Flood Insurance Maps in New England

FEMA has requested USGS expertise in hydraulics, hydrology, and mapping to generate flood insurance maps for New England.
By
New England Water Science Center
Development of Flood Insurance Maps in New England

Development of Flood Insurance Maps in New England

FEMA has requested USGS expertise in hydraulics, hydrology, and mapping to generate flood insurance maps for New England.
Learn More
Flooding in Soldier Pond, Maine

Development of Regional Regression Equations in Connecticut

Knowledge of the magnitude and frequency of floods is needed for the effective and safe design of bridges, culverts, and other structures. This information is also important for flood-plain planning and management. Periodic examination of flood-frequency characteristics is essential to ensure the best estimates of flood magnitudes for a given annual exceedance probabilities (AEP).
By
New England Water Science Center
Development of Regional Regression Equations in Connecticut

Development of Regional Regression Equations in Connecticut

Knowledge of the magnitude and frequency of floods is needed for the effective and safe design of bridges, culverts, and other structures. This information is also important for flood-plain planning and management. Periodic examination of flood-frequency characteristics is essential to ensure the best estimates of flood magnitudes for a given annual exceedance probabilities (AEP).
Learn More

Data and R Code to Derive Estimates of Groundwater Levels Using MOVE.1 Regression and Compute Monthly Percentiles for Select Wells in Massachusetts Data and R Code to Derive Estimates of Groundwater Levels Using MOVE.1 Regression and Compute Monthly Percentiles for Select Wells in Massachusetts

This data release contains extended estimates of daily groundwater levels and monthly percentiles at 27 short-term monitoring wells in Massachusetts. The Maintenance of Variance Extension Type 1 (MOVE.1) regression method was used to extend short-term groundwater levels at wells with less than 10 years of continuous data. This method uses groundwater level data from a correlated long...
By
New England Water Science Center
Filter Total Items: 19

Methods for estimating selected low-flow statistics at gaged and ungaged stream sites in Massachusetts Methods for estimating selected low-flow statistics at gaged and ungaged stream sites in Massachusetts

The U.S. Geological Survey, in cooperation with the Massachusetts Department of Conservation and Recreation, Office of Water Resources, computed selected at-site streamflow statistics at U.S. Geological Survey streamgages in and near Massachusetts and developed regional regression equations for estimating selected streamflows at ungaged stream sites in Massachusetts. Two sets of regional...
Authors
Gardner C. Bent, Elizabeth Ahearn, Jennifer Fair
By
New England Water Science Center

Development of regression equations to estimate flow durations, low-flow frequencies, and mean flows at ungaged stream sites in Connecticut using data through water year 2022 Development of regression equations to estimate flow durations, low-flow frequencies, and mean flows at ungaged stream sites in Connecticut using data through water year 2022

To aid Federal and State regulatory agencies in the effective management of water resources, the U.S. Geological Survey, in cooperation with the Connecticut Department of Energy and Environmental Protection and the Connecticut Department of Transportation, updated flow statistics for 118 streamgages and developed 47 regression equations to estimate selected flow duration, low flow, and...
Authors
Elizabeth Ahearn, Gardner C. Bent
By
New England Water Science Center

Flood of July 2023 in Vermont Flood of July 2023 in Vermont

A major storm caused catastrophic flooding in many parts of Vermont on July 9–12, 2023, resulting in millions of dollars in damages. The high amount of rainfall caused several rivers to peak at record levels, in some cases exceeding records set during Tropical Storm Irene in 2011. The U.S. Geological Survey, in cooperation with the Federal Emergency Management Agency, collected and...
Authors
Travis Smith, Scott A. Olson, James LeNoir, Rena Kalmon, Elizabeth Ahearn
By
New England Water Science Center

Estimating groundwater level records using MOVE.1 and computing monthly percentiles from estimated groundwater records in Massachusetts Estimating groundwater level records using MOVE.1 and computing monthly percentiles from estimated groundwater records in Massachusetts

The U.S. Geological Survey, in cooperation with the Massachusetts Department of Environmental Protection, performed record extensions on groundwater levels at select wells using the Maintenance of Variance Extension type 1 (MOVE.1) method. The groundwater levels estimated from these record extensions were used to compute monthly percentiles to improve future determinations of a...
Authors
Elizabeth Ahearn, Dee-Ann Crozier
By
Water Resources Mission Area, New England Water Science Center

Estimating flood magnitude and frequency on streams and rivers in Connecticut, based on data through water year 2015 Estimating flood magnitude and frequency on streams and rivers in Connecticut, based on data through water year 2015

The U.S. Geological Survey, in cooperation with the Connecticut Department of Transportation, updated flood-frequency estimates with 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities (2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year recurrence intervals, respectively) for 141 streamgages in Connecticut and 11 streamgages in adjacent States using annual peak...
Authors
Elizabeth Ahearn, Glenn Hodgkins
By
Water Resources Mission Area, New England Water Science Center, StreamStats

Methods for estimating regional coefficient of skewness for unregulated streams in New England, based on data through water year 2011 Methods for estimating regional coefficient of skewness for unregulated streams in New England, based on data through water year 2011

The magnitude of annual exceedance probability floods is greatly affected by the coefficient of skewness (skew) of the annual peak flows at a streamgage. Standard flood frequency methods recommend weighting the station skew with a regional skew to better represent regional and stable conditions. This study presents an updated analysis of a regional skew for New England developed using a...
Authors
Andrea Veilleux, Phillip Zarriello, Glenn Hodgkins, Elizabeth Ahearn, Scott A. Olson, Timothy Cohn
By
Water Resources Mission Area

Flood inundation maps and water-surface profiles for tropical storm Irene and selected annual exceedance probability floods for Flint Brook and the Third Branch White River in Roxbury, Vermont Flood inundation maps and water-surface profiles for tropical storm Irene and selected annual exceedance probability floods for Flint Brook and the Third Branch White River in Roxbury, Vermont

Flint Brook, a tributary to the Third Branch White River in Roxbury, Vermont, has a history of flooding the Vermont Fish and Wildlife Department’s Roxbury Fish Culture Station (the hatchery) and surrounding infrastructure. Flooding resulting from tropical storm Irene on August 28–29, 2011, caused widespread destruction in the region, including extensive and costly damages to the State...
Authors
Elizabeth Ahearn, Pamela J. Lombard
By
New England Water Science Center

Nutrient concentrations and loads in the northeastern United States - Status and trends, 1975-2003 Nutrient concentrations and loads in the northeastern United States - Status and trends, 1975-2003

The U.S. Geological Survey (USGS) National Water-Quality Assessment Program (NAWQA) began regional studies in 2003 to synthesize information on nutrient concentrations, trends, stream loads, and sources. In the northeastern United States, a study area that extends from Maine to central Virginia, nutrient data were evaluated for 130 USGS water-quality monitoring stations. Nutrient data...
Authors
Elaine Trench, Richard Moore, Elizabeth Ahearn, John Mullaney, R. Hickman, Gregory E. Schwarz
By
New England Water Science Center, USGS Science in Long Island Sound and its Watershed

Magnitude of flood flows for selected annual exceedance probabilities in Rhode Island through 2010 Magnitude of flood flows for selected annual exceedance probabilities in Rhode Island through 2010

Heavy persistent rains from late February through March 2010 caused severe widespread flooding in Rhode Island that set or nearly set record flows and water levels at many long-term streamgages in the State. In response, the U.S. Geological Survey, in partnership with the Federal Emergency Management Agency, conducted a study to update estimates of flood magnitudes at streamgages and...
Authors
Phillip Zarriello, Elizabeth Ahearn, Sara Levin
By
New England Water Science Center, StreamStats

USGS library for S-PLUS for Windows -- Release 4.0 USGS library for S-PLUS for Windows -- Release 4.0

Release 4.0 of the U.S. Geological Survey S-PLUS library supercedes release 2.1. It comprises functions, dialogs, and datasets used in the U.S. Geological Survey for the analysis of water-resources data. This version does not contain ESTREND, which was in version 2.1. See Release 2.1 for information and access to that version. This library requires Release 8.1 or later of S-PLUS for...
Authors
David Lorenz, Elizabeth Ahearn, Janet Carter, Timothy A. Cohn, Wendy Danchuk, Jeffrey Frey, Dennis R. Helsel, Kathy Lee, David Leeth, Jeffrey Martin, Virginia McGuire, Kathleen Neitzert, Dale Robertson, James Slack, J. Jeffrey Starn, Aldo Vecchia, Donald Wilkison, Joyce E. Williamson
By
Water Resources Mission Area, Upper Midwest Environmental Sciences Center, Upper Midwest Water Science Center

Connecticut Highlands technical report— Documentation of the regional rainfall-runoff model Connecticut Highlands technical report— Documentation of the regional rainfall-runoff model

This report provides the supporting data and describes the data sources, methodologies, and assumptions used in the assessment of existing and potential water resources of the Highlands of Connecticut and Pennsylvania (referred to herein as the “Highlands”). Included in this report are Highlands groundwater and surface-water use data and the methods of data compilation. Annual mean...
Authors
Elizabeth Ahearn, David Bjerklie
By
New England Water Science Center

Regional Regression Equations to Estimate Flow-Duration Statistics at Ungaged Stream Sites in Connecticut Regional Regression Equations to Estimate Flow-Duration Statistics at Ungaged Stream Sites in Connecticut

Multiple linear regression equations for determining flow-duration statistics were developed to estimate select flow exceedances ranging from 25- to 99-percent for six 'bioperiods'-Salmonid Spawning (November), Overwinter (December-February), Habitat Forming (March-April), Clupeid Spawning (May), Resident Spawning (June), and Rearing and Growth (July-October)-in Connecticut. Regression...
Authors
Elizabeth Ahearn
By
New England Water Science Center
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