Skip to main content
U.S. flag

An official website of the United States government

Helen F Malenda (Former Employee)

Science and Products

link
USGS

Elbert County Groundwater Network

Elbert County, Colorado relies heavily on nonrenewable groundwater from the Denver Basin aquifers for water supply. Population growth in the county has placed increasing demands on groundwater resources, and future groundwater withdrawals are expected to increase as the population continues to grow. A detailed program to monitor groundwater levels in the Denver Basin aquifers throughout the county...
By
Colorado Water Science Center
link

Elbert County Groundwater Network

Elbert County, Colorado relies heavily on nonrenewable groundwater from the Denver Basin aquifers for water supply. Population growth in the county has placed increasing demands on groundwater resources, and future groundwater withdrawals are expected to increase as the population continues to grow. A detailed program to monitor groundwater levels in the Denver Basin aquifers throughout the county...
Learn More
link
Douglas county Colorado groundwater well 391654104464501

Rural Douglas County Groundwater Network

More than 70 percent of the municipal water supply in the south Denver metropolitan area is provided by groundwater, and homeowners in rural areas depend solely on self-supplied groundwater for water supply. Increased groundwater withdrawal to meet the demand of the rapidly growing population is causing water levels to decline. The U.S. Geological Survey, in cooperation with the Rural Water...
By
Colorado Water Science Center
link

Rural Douglas County Groundwater Network

More than 70 percent of the municipal water supply in the south Denver metropolitan area is provided by groundwater, and homeowners in rural areas depend solely on self-supplied groundwater for water supply. Increased groundwater withdrawal to meet the demand of the rapidly growing population is causing water levels to decline. The U.S. Geological Survey, in cooperation with the Rural Water...
Learn More

Near-surface geophysical data collected along French Gulch near Breckenridge, Colorado, USA, September 2020

Near-surface geophysical surveys were completed in September 2020 in a mine-affected drainage near Breckenridge, Colorado, known as French Gulch. The study area was along a 0.3 mile (0.5 kilometer [km]) reach of French Gulch, approximately 2 river miles upstream from its confluence with the Blue River. This data release presents data from three geophysical surveys that used fiber-optic distributed
By
Colorado Water Science Center

Geologic map of the Ferncliff and Louisa quadrangles, Louisa, Fluvanna, and Goochland Counties, Virginia

The area encompassed by the geologic map of the Ferncliff and Louisa, Va., 7.5-minute quadrangles includes the hypothetical surface projection of the Quail fault, which is the subsurface fault that was responsible for the 2011 magnitude 5.8 (M5.8) Mineral, Va., earthquake. The mapping shows that the Quail fault appears to have reactivated the Harris Creek fault, a Paleozoic fault that has been map
By
Florence Bascom Geoscience Center

The applicability of time-integrated unit stream power for estimating bridge pier scour using noncontact methods in a gravel-bed river

In near-field remote sensing, noncontact methods (radars) that measure stage and surface water velocity have the potential to supplement traditional bridge scour monitoring tools because they are safer to access and are less likely to be damaged compared with in-stream sensors. The objective of this study was to evaluate the use of radars for monitoring the hydraulic conditions that contribute to
Authors
Laura A. Hempel, Helen F. Malenda, John Fulton, Mark F. Henneberg, Jay Cederberg, Tommaso Moramarco
By
Water Resources Mission Area, Arizona Water Science Center, Colorado Water Science Center

River terrace evidence of tectonic processes in the eastern North American plate interior, South Anna River, Virginia

We show that long-recognized seismicity in the central Virginia seismic zone of the eastern North American intraplate setting arises primarily from tectonic processes predicted by new, fully coupled plate tectonic geodynamic models. The study leverages much new geophysical and geologic data following the 2011 Mineral, Virginia, earthquake that ruptured a steeply dipping, northwest-verging reverse
Authors
Frank J. Pazzaglia, Helen F. Malenda, Matthew L. McGavick, Cody Raup, Mark W. Carter, Claudio Berti, Shannon A. Mahan, Michelle S. Nelson, Tammy M. Rittenour, Ron Counts, Jane K Willenbring, Dru Germanoski, Stephen C. Peters, William D. Holt
By
Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center, Geosciences and Environmental Change Science Center, Florence Bascom Geoscience Center

Groundwater levels in the Denver Basin bedrock aquifers of Douglas County, Colorado, 2011–19

Municipal and domestic water users in Douglas County, Colorado, rely on groundwater from the bedrock aquifers in the Denver Basin aquifer system as part of their water supply. The four principal Denver Basin bedrock aquifers are, from shallowest to deepest, the Dawson aquifer (divided administratively into “upper” and “lower” Dawson aquifers in Douglas County), the Denver aquifer, the Arapahoe aqu
Authors
Helen F. Malenda, Colin A. Penn
By
Water Resources Mission Area, Colorado Water Science Center

Arsenic concentrations after drinking water well installation: Time-varying effects on arsenic mobilization

Chronic exposure to geogenic arsenic via drinking water is a worldwide health concern. However, effects of well installation and operation on arsenic concentrations and mobilization are not well understood. This knowledge gap impacts both reliable detection of arsenic in drinking water and effective public health recommendations to reduce exposure to arsenic. This study examines changes in arsenic
Authors
Melinda L. Erickson, Helen F. Malenda, Emily C. Berquist, Joseph D. Ayotte
By
Upper Midwest Water Science Center

How or when samples are collected affects measured arsenic concentration in new drinking water wells

Naturally occurring arsenic can adversely affect water quality in geologically diverse aquifers throughout the world. Chronic exposure to arsenic via drinking water is a human health concern due to risks for certain cancers, skin abnormalities, peripheral neuropathy, and other negative health effects. Statewide in Minnesota, USA, 11% of samples from new drinking water wells have arsenic concentrat
Authors
Melinda L. Erickson, Helen F. Malenda, Emily C. Berquist
By
Upper Midwest Water Science Center

Geomorphology, active tectonics, and landscape evolution in the Mid-Atlantic region

In 2014, the geomorphology community marked the 125th birthday of one of its most influential papers, “The Rivers and Valleys of Pennsylvania” by William Morris Davis. Inspired by Davis’s work, the Appalachian landscape rapidly became fertile ground for the development and testing of several grand landscape evolution paradigms, culminating with John Hack’s dynamic equilibrium in 1960. As part of t
Authors
Frank J. Pazzaglia, Mark W. Carter, Claudio Berti, Ronald C. Counts, Gregory S. Hancock, David Harbor, Richard W. Harrison, Matthew J. Heller, Shannon A. Mahan, Helen Malenda, Ryan McKeon, Michelle S. Nelson, Phillip Prince, Tammy M. Rittenour, James Spotilla, G. Richard Whittecar
By
Florence Bascom Geoscience Center, Geosciences and Environmental Change Science Center

Non-USGS Publications**

Melinda L. Erickson, Helen F. Malenda, Emily C. Berquist, Joseph D. Ayotte, Arsenic concentrations after drinking water well installation: Time-varying effects on arsenic mobilization, Science of The Total Environment, Volume 678, 2019, Pages 681-691, ISSN 0048-9697, https://doi.org/10.1016/j.scitotenv.2019.04.362.
Malenda, H. F., Sutfin, N. A., Guryan, G., Stauffer, S., Rowland, J. C., Williams, K. H., and Singha, K. ( 2019) From Grain to Floodplain: Evaluating heterogeneity of floodplain hydrostatigraphy using sedimentology, geophysics, and remote sensing. Earth Surf. Process. Landforms, 44: 1799– 1815. https://doi.org/10.1002/esp.4613.
Erickson, M.L., Malenda, H.F. and Berquist, E.C. (2018), How or When Samples Are Collected Affects Measured Arsenic Concentration in New Drinking Water Wells. Groundwater, 56: 921-933. doi:10.1111/gwat.12643
Pai, H., Malenda, H. F., Briggs, M. A., Singha, K., González‐Pinzón, R., Gooseff, M. N., … the AirCTEMPS Team ( 2017). Potential for small unmanned aircraft systems applications for identifying groundwater‐surface water exchange in a meandering river reach. Geophysical Research Letters, 44, 11,868– 11,877. https://doi.org/10.1002/2017GL075836
Malenda, Helen Fitzgerald, "New Quaternary geochronometric constraints on river incision in the Virginia Piedmont: Relative contributions of climate, base-level fall, knickpoint retreat, and active tectonics" (2015). Theses and Dissertations. 2709.
https://preserve.lehigh.edu/etd/2709
Elizabeth A. Heness, Edward L. Simpson, Adam J. Bumby, Patrick G. Eriksson, Kenneth A. Eriksson, Hannah L. Hilbert-Wolf, O.J. Okafor, Sarah Linnevelt, H. Fitzgerald Malenda, Tshepiso Modungwa, Evidence for climate shifts in the ~2.0Ga upper Makgabeng Formation erg, South Africa, Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 409, 2014, Pages 265-279, ISSN 0031-0182, https://doi.org/10.1016/j.palaeo.2014.05.016.
Edward L. Simpson, Elizabeth Heness, Adam Bumby, Patrick G. Eriksson, Kenneth A. Eriksson, Hannah L. Hilbert-Wolf, Sarah Linnevelt, H. Fitzgerald Malenda, Tshepiso Modungwa, O.J. Okafor, Evidence for 2.0Ga continental microbial mats in a paleodesert setting, Precambrian Research, Volume 237, 2013, Pages 36-50, ISSN 0301-9268, https://doi.org/10.1016/j.precamres.2013.08.001.
H. Fitzgerald Malenda, Edward L. Simpson, Michael J. Szajna, David L. Fillmore, Brian W. Hartline, Elizabeth A. Heness, Erin R. Kraal, Jewels L. Wilk,
Taphonomy of lacustrine shoreline fish-part conglomerates in the Late Triassic age Lockatong Formation (Collegeville, Pennsylvania, USA): Toward the recognition of catastrophic fish kills in the rock record, Palaeogeography, Palaeoclimatology, Palaeoecology, Volumes 313–314, 2012, Pages 234-245, ISSN 0031-0182, https://doi.org/10.1016/j.palaeo.2011.11.022.
K. Moran, H.L. Hilbert-Wolf, K. Golder, H.F. Malenda, C.J. Smith, L.P. Storm, E.L. Simpson, M.C. Wizevich, S.E. Tindall, Attributes of the wood-boring trace fossil Asthenopodichnium in the Late Cretaceous Wahweap Formation, Utah, USA, Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 297, Issues 3–4, 2010, Pages 662-669, ISSN 0031-0182, https://doi.org/10.1016/j.palaeo.2010.09.015.
W.S. Simpson, E.L. Simpson, M.C. Wizevich, H.F. Malenda, H.L. Hilbert-Wolf, S.E. Tindall, A preserved Late Cretaceous biological soil crust in the capping sandstone member, Wahweap Formation, Grand Staircase-Escalante National Monument, Utah: Paleoclimatic implications, Sedimentary Geology, Volume 230, Issues 3–4, 2010, Pages 139-145, ISSN 0037-0738, https://doi.org/10.1016/j.sedgeo.2010.07.004.

**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.

Science and Products

link
USGS

Elbert County Groundwater Network

Elbert County, Colorado relies heavily on nonrenewable groundwater from the Denver Basin aquifers for water supply. Population growth in the county has placed increasing demands on groundwater resources, and future groundwater withdrawals are expected to increase as the population continues to grow. A detailed program to monitor groundwater levels in the Denver Basin aquifers throughout the county...
By
Colorado Water Science Center
link

Elbert County Groundwater Network

Elbert County, Colorado relies heavily on nonrenewable groundwater from the Denver Basin aquifers for water supply. Population growth in the county has placed increasing demands on groundwater resources, and future groundwater withdrawals are expected to increase as the population continues to grow. A detailed program to monitor groundwater levels in the Denver Basin aquifers throughout the county...
Learn More
link
Douglas county Colorado groundwater well 391654104464501

Rural Douglas County Groundwater Network

More than 70 percent of the municipal water supply in the south Denver metropolitan area is provided by groundwater, and homeowners in rural areas depend solely on self-supplied groundwater for water supply. Increased groundwater withdrawal to meet the demand of the rapidly growing population is causing water levels to decline. The U.S. Geological Survey, in cooperation with the Rural Water...
By
Colorado Water Science Center
link

Rural Douglas County Groundwater Network

More than 70 percent of the municipal water supply in the south Denver metropolitan area is provided by groundwater, and homeowners in rural areas depend solely on self-supplied groundwater for water supply. Increased groundwater withdrawal to meet the demand of the rapidly growing population is causing water levels to decline. The U.S. Geological Survey, in cooperation with the Rural Water...
Learn More

Near-surface geophysical data collected along French Gulch near Breckenridge, Colorado, USA, September 2020

Near-surface geophysical surveys were completed in September 2020 in a mine-affected drainage near Breckenridge, Colorado, known as French Gulch. The study area was along a 0.3 mile (0.5 kilometer [km]) reach of French Gulch, approximately 2 river miles upstream from its confluence with the Blue River. This data release presents data from three geophysical surveys that used fiber-optic distributed
By
Colorado Water Science Center

Geologic map of the Ferncliff and Louisa quadrangles, Louisa, Fluvanna, and Goochland Counties, Virginia

The area encompassed by the geologic map of the Ferncliff and Louisa, Va., 7.5-minute quadrangles includes the hypothetical surface projection of the Quail fault, which is the subsurface fault that was responsible for the 2011 magnitude 5.8 (M5.8) Mineral, Va., earthquake. The mapping shows that the Quail fault appears to have reactivated the Harris Creek fault, a Paleozoic fault that has been map
By
Florence Bascom Geoscience Center

The applicability of time-integrated unit stream power for estimating bridge pier scour using noncontact methods in a gravel-bed river

In near-field remote sensing, noncontact methods (radars) that measure stage and surface water velocity have the potential to supplement traditional bridge scour monitoring tools because they are safer to access and are less likely to be damaged compared with in-stream sensors. The objective of this study was to evaluate the use of radars for monitoring the hydraulic conditions that contribute to
Authors
Laura A. Hempel, Helen F. Malenda, John Fulton, Mark F. Henneberg, Jay Cederberg, Tommaso Moramarco
By
Water Resources Mission Area, Arizona Water Science Center, Colorado Water Science Center

River terrace evidence of tectonic processes in the eastern North American plate interior, South Anna River, Virginia

We show that long-recognized seismicity in the central Virginia seismic zone of the eastern North American intraplate setting arises primarily from tectonic processes predicted by new, fully coupled plate tectonic geodynamic models. The study leverages much new geophysical and geologic data following the 2011 Mineral, Virginia, earthquake that ruptured a steeply dipping, northwest-verging reverse
Authors
Frank J. Pazzaglia, Helen F. Malenda, Matthew L. McGavick, Cody Raup, Mark W. Carter, Claudio Berti, Shannon A. Mahan, Michelle S. Nelson, Tammy M. Rittenour, Ron Counts, Jane K Willenbring, Dru Germanoski, Stephen C. Peters, William D. Holt
By
Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center, Geosciences and Environmental Change Science Center, Florence Bascom Geoscience Center

Groundwater levels in the Denver Basin bedrock aquifers of Douglas County, Colorado, 2011–19

Municipal and domestic water users in Douglas County, Colorado, rely on groundwater from the bedrock aquifers in the Denver Basin aquifer system as part of their water supply. The four principal Denver Basin bedrock aquifers are, from shallowest to deepest, the Dawson aquifer (divided administratively into “upper” and “lower” Dawson aquifers in Douglas County), the Denver aquifer, the Arapahoe aqu
Authors
Helen F. Malenda, Colin A. Penn
By
Water Resources Mission Area, Colorado Water Science Center

Arsenic concentrations after drinking water well installation: Time-varying effects on arsenic mobilization

Chronic exposure to geogenic arsenic via drinking water is a worldwide health concern. However, effects of well installation and operation on arsenic concentrations and mobilization are not well understood. This knowledge gap impacts both reliable detection of arsenic in drinking water and effective public health recommendations to reduce exposure to arsenic. This study examines changes in arsenic
Authors
Melinda L. Erickson, Helen F. Malenda, Emily C. Berquist, Joseph D. Ayotte
By
Upper Midwest Water Science Center

How or when samples are collected affects measured arsenic concentration in new drinking water wells

Naturally occurring arsenic can adversely affect water quality in geologically diverse aquifers throughout the world. Chronic exposure to arsenic via drinking water is a human health concern due to risks for certain cancers, skin abnormalities, peripheral neuropathy, and other negative health effects. Statewide in Minnesota, USA, 11% of samples from new drinking water wells have arsenic concentrat
Authors
Melinda L. Erickson, Helen F. Malenda, Emily C. Berquist
By
Upper Midwest Water Science Center

Geomorphology, active tectonics, and landscape evolution in the Mid-Atlantic region

In 2014, the geomorphology community marked the 125th birthday of one of its most influential papers, “The Rivers and Valleys of Pennsylvania” by William Morris Davis. Inspired by Davis’s work, the Appalachian landscape rapidly became fertile ground for the development and testing of several grand landscape evolution paradigms, culminating with John Hack’s dynamic equilibrium in 1960. As part of t
Authors
Frank J. Pazzaglia, Mark W. Carter, Claudio Berti, Ronald C. Counts, Gregory S. Hancock, David Harbor, Richard W. Harrison, Matthew J. Heller, Shannon A. Mahan, Helen Malenda, Ryan McKeon, Michelle S. Nelson, Phillip Prince, Tammy M. Rittenour, James Spotilla, G. Richard Whittecar
By
Florence Bascom Geoscience Center, Geosciences and Environmental Change Science Center

Non-USGS Publications**

Melinda L. Erickson, Helen F. Malenda, Emily C. Berquist, Joseph D. Ayotte, Arsenic concentrations after drinking water well installation: Time-varying effects on arsenic mobilization, Science of The Total Environment, Volume 678, 2019, Pages 681-691, ISSN 0048-9697, https://doi.org/10.1016/j.scitotenv.2019.04.362.
Malenda, H. F., Sutfin, N. A., Guryan, G., Stauffer, S., Rowland, J. C., Williams, K. H., and Singha, K. ( 2019) From Grain to Floodplain: Evaluating heterogeneity of floodplain hydrostatigraphy using sedimentology, geophysics, and remote sensing. Earth Surf. Process. Landforms, 44: 1799– 1815. https://doi.org/10.1002/esp.4613.
Erickson, M.L., Malenda, H.F. and Berquist, E.C. (2018), How or When Samples Are Collected Affects Measured Arsenic Concentration in New Drinking Water Wells. Groundwater, 56: 921-933. doi:10.1111/gwat.12643
Pai, H., Malenda, H. F., Briggs, M. A., Singha, K., González‐Pinzón, R., Gooseff, M. N., … the AirCTEMPS Team ( 2017). Potential for small unmanned aircraft systems applications for identifying groundwater‐surface water exchange in a meandering river reach. Geophysical Research Letters, 44, 11,868– 11,877. https://doi.org/10.1002/2017GL075836
Malenda, Helen Fitzgerald, "New Quaternary geochronometric constraints on river incision in the Virginia Piedmont: Relative contributions of climate, base-level fall, knickpoint retreat, and active tectonics" (2015). Theses and Dissertations. 2709.
https://preserve.lehigh.edu/etd/2709
Elizabeth A. Heness, Edward L. Simpson, Adam J. Bumby, Patrick G. Eriksson, Kenneth A. Eriksson, Hannah L. Hilbert-Wolf, O.J. Okafor, Sarah Linnevelt, H. Fitzgerald Malenda, Tshepiso Modungwa, Evidence for climate shifts in the ~2.0Ga upper Makgabeng Formation erg, South Africa, Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 409, 2014, Pages 265-279, ISSN 0031-0182, https://doi.org/10.1016/j.palaeo.2014.05.016.
Edward L. Simpson, Elizabeth Heness, Adam Bumby, Patrick G. Eriksson, Kenneth A. Eriksson, Hannah L. Hilbert-Wolf, Sarah Linnevelt, H. Fitzgerald Malenda, Tshepiso Modungwa, O.J. Okafor, Evidence for 2.0Ga continental microbial mats in a paleodesert setting, Precambrian Research, Volume 237, 2013, Pages 36-50, ISSN 0301-9268, https://doi.org/10.1016/j.precamres.2013.08.001.
H. Fitzgerald Malenda, Edward L. Simpson, Michael J. Szajna, David L. Fillmore, Brian W. Hartline, Elizabeth A. Heness, Erin R. Kraal, Jewels L. Wilk,
Taphonomy of lacustrine shoreline fish-part conglomerates in the Late Triassic age Lockatong Formation (Collegeville, Pennsylvania, USA): Toward the recognition of catastrophic fish kills in the rock record, Palaeogeography, Palaeoclimatology, Palaeoecology, Volumes 313–314, 2012, Pages 234-245, ISSN 0031-0182, https://doi.org/10.1016/j.palaeo.2011.11.022.
K. Moran, H.L. Hilbert-Wolf, K. Golder, H.F. Malenda, C.J. Smith, L.P. Storm, E.L. Simpson, M.C. Wizevich, S.E. Tindall, Attributes of the wood-boring trace fossil Asthenopodichnium in the Late Cretaceous Wahweap Formation, Utah, USA, Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 297, Issues 3–4, 2010, Pages 662-669, ISSN 0031-0182, https://doi.org/10.1016/j.palaeo.2010.09.015.
W.S. Simpson, E.L. Simpson, M.C. Wizevich, H.F. Malenda, H.L. Hilbert-Wolf, S.E. Tindall, A preserved Late Cretaceous biological soil crust in the capping sandstone member, Wahweap Formation, Grand Staircase-Escalante National Monument, Utah: Paleoclimatic implications, Sedimentary Geology, Volume 230, Issues 3–4, 2010, Pages 139-145, ISSN 0037-0738, https://doi.org/10.1016/j.sedgeo.2010.07.004.

**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.

Was this page helpful?