John A Engott
John A Engott - California Water Science Center
Science and Products
Regional Groundwater Availability Study of the California Coastal Basins
This study seeks to quantify water availability in the California Coastal Basins (CCBs). The CCBs vary greatly in their geologic, hydrologic, and climatic conditions; predominant water uses (agricultural, urban, or environmental); and how water availability changes in response to natural and anthropogenic stresses. Considering the complex dynamics of the CCBs and the history of managing water...
Model application data for co-developed surface watershed and groundwater hydrologic models for the Upper Colorado River Basin Model application data for co-developed surface watershed and groundwater hydrologic models for the Upper Colorado River Basin
Co-developed surface and subsurface hydrologic models for the Upper Colorado River Basin and the Colorado Plateaus principal aquifer system were used to investigate the drivers of change in hydrologic water budget components during contrasting recent wet (1982–1999) and drought (2000–2022) time periods in select headwater subregions of the Upper Colorado River Basin. The hydrologic...
GSFLOW model to extend the San Antonio Creek Integrated Model and simulate future water availability scenarios, San Antonio Creek Valley watershed, Santa Barbara County, California GSFLOW model to extend the San Antonio Creek Integrated Model and simulate future water availability scenarios, San Antonio Creek Valley watershed, Santa Barbara County, California
In the San Antonio Creek Valley Watershed (SACVW) of Santa Barbara County, California, climatic conditions, surface-water diversions, and groundwater withdrawals potentially affect water availability, magnitude of streamflow in San Antonio Creek, and the extent and quality of protected species habitat in the Barka Slough wetland. Future climate in central California may have warmer and...
Russian River Integrated Hydrologic Model (RRIHM): Watershed Data Russian River Integrated Hydrologic Model (RRIHM): Watershed Data
The Russian River Watershed (RRW) covers about 1,300 square miles (without Santa Rosa Plain) of urban, agricultural, and forested lands in northern Sonoma County and southern Mendocino County, California. Communities in the RRW depend on a combination of Russian River water and groundwater to meet their water-supply demands. Water is used primarily for agricultural irrigation, municipal...
Russian River Integrated Hydrologic Model (RRIHM): Climate Data for 1990-2015 Russian River Integrated Hydrologic Model (RRIHM): Climate Data for 1990-2015
The Russian River Watershed (RRW) covers about 1,300 square miles (without Santa Rosa Plain) of urban, agricultural, and forested lands in northern Sonoma County and southern Mendocino County, California. Communities in the RRW depend on a combination of Russian River water and groundwater to meet their water-supply demands. Water is used primarily for agricultural irrigation, municipal...
Russian River Integrated Hydrologic Model (RRIHM): Groundwater & Streamflow Observations Russian River Integrated Hydrologic Model (RRIHM): Groundwater & Streamflow Observations
The Russian River Watershed (RRW) covers about 1300 square miles (without Santa Rosa Plain) of urban, agricultural, and forested lands in northern Sonoma County and southern Mendocino County, California. Communities in the RRW depend on a combination of Russian River water and groundwater to meet their water-supply demands. Water is used primarily for agricultural irrigation, municipal...
Mean annual water-budget components for the Island of Oahu, Hawaii, for current conditions, 2001-10 rainfall and 2001-10 land cover (version 2.0) Mean annual water-budget components for the Island of Oahu, Hawaii, for current conditions, 2001-10 rainfall and 2001-10 land cover (version 2.0)
The shapefile associated with this metadata file represents the spatial distribution of mean annual water-budget components, in inches, for the Island of Oahu, Hawaii. The water-budget components in the shapefile were computed by a water-budget model for a scenario representative of current conditions (2001-10 rainfall and 2001-10 land cover), as described in USGS Scientific...
Mean annual water-budget components for the Island of Oahu, Hawaii, for predevelopment conditions, 1978-2007 rainfall and 1870 land cover (version 2.0) Mean annual water-budget components for the Island of Oahu, Hawaii, for predevelopment conditions, 1978-2007 rainfall and 1870 land cover (version 2.0)
The shapefile associated with this metadata file represents the spatial distribution of mean annual water-budget components, in inches, for the Island of Oahu, Hawaii. The water-budget components in the shapefile were computed by a water-budget model for a scenario representative of predevelopment conditions (1978-2007 rainfall and 1870 land cover), as described in USGS Scientific...
Filter Total Items: 15
Hydrologic response of groundwater and streamflow to natural and anthropogenic drivers of change in headwaters of the upper Colorado River basin during recent wet (1982–1999) and drought (2000–2022) conditions Hydrologic response of groundwater and streamflow to natural and anthropogenic drivers of change in headwaters of the upper Colorado River basin during recent wet (1982–1999) and drought (2000–2022) conditions
Study region: Headwaters of the upper Colorado River basin (UCOL), USA Study focus: Surface-water and groundwater numerical models incorporating water-use information were used to investigate changes in climate, water use, and simulated hydrologic responses of snow processes, evapotranspiration, groundwater, and streamflow during recent wet (1982–1999) and drought (2000–2022) periods in...
Authors
Fred Tillman, Melissa Masbruch, Jacob E. Knight, John Engott, Samuel Lopez, Casey Jones, Jesse Dickinson, Matthew P. Miller
Yucaipa valley integrated hydrological model Yucaipa valley integrated hydrological model
Introduction The hydrologic system in the Yucaipa Valley watershed (YVW) was simulated using the coupled Groundwater and Surface-water FLOW model (GSFLOW; Markstrom and others, 2008). This study uses version 2.0 of GSFLOW, which is a combination of the Precipitation-Runoff Modeling System (PRMS; Markstrom and others, 2015), and the Newton-Raphson formulation of the Modular Groundwater...
Authors
Ayman Alzraiee, John Engott, Geoffrey Cromwell, Linda Woolfenden
Hydrogeologic characterization of the Yucaipa groundwater subbasin Hydrogeologic characterization of the Yucaipa groundwater subbasin
Introduction Water management in the Santa Ana River watershed in San Bernardino and Riverside Counties in southern California (fig. A1) is complex with various water purveyors navigating geographic, geologic, hydrologic, and political challenges to provide a reliable water supply to stakeholders. As the population has increased throughout southern California, so has the demand for water...
Authors
Geoffrey Cromwell, John Engott, Ayman Alzraiee, Christina Stamos-Pfeiffer, Gregory Mendez, Meghan Dick, Sandra Bond
Simulation of groundwater and surface-water resources of the San Antonio Creek Valley watershed, Santa Barbara County, California Simulation of groundwater and surface-water resources of the San Antonio Creek Valley watershed, Santa Barbara County, California
In the San Antonio Creek Valley watershed (SACVW), western Santa Barbara County, California, groundwater is the primary source of water for agricultural irrigation, the town of Los Alamos, and supplemental water to Vandenberg Space Force Base (VSFB). Groundwater pumpage has increased since the 1970s as non-irrigated agricultural land has been converted to irrigated land and as local...
Authors
Linda Woolfenden, John Engott, Joshua Larsen, Geoffrey Cromwell
Hydrogeologic characterization of the San Antonio Creek Valley watershed, Santa Barbara County, California Hydrogeologic characterization of the San Antonio Creek Valley watershed, Santa Barbara County, California
The San Antonio Creek Valley watershed (SACVW) is located in western Santa Barbara County, about 15 miles south of Santa Maria and 55 miles north of Santa Barbara, California. The SACVW is about 135 square miles and encompasses the San Antonio Creek Valley groundwater basin; the SACVW is separated from adjacent groundwater basins by the Casmalia and Solomon Hills to the north, and the...
Authors
Geoffrey Cromwell, Donald Sweetkind, Jill Densmore, John Engott, Whitney Seymour, Joshua Larsen, Christopher P. Ely, Christina Stamos, Claudia C. Faunt
Numerical simulation of groundwater availability in central Moloka‘i, Hawai‘i Numerical simulation of groundwater availability in central Moloka‘i, Hawai‘i
Since the 1990s, increased chloride concentrations of water pumped from wells (much of which is used for drinking water) and the effects of withdrawals on groundwater-dependent ecosystems have led to concerns over groundwater availability on the island of Molokaʻi, Hawaiʻi. An improved understanding of the hydrologic effects of proposed groundwater withdrawals is needed to ensure...
Authors
Delwyn Oki, John Engott, Kolja Rotzoll
SWB Version 2.0—A soil-water-balance code for estimating net infiltration and other water-budget components SWB Version 2.0—A soil-water-balance code for estimating net infiltration and other water-budget components
The U.S. Geological Survey’s Soil-Water-Balance (SWB) code was developed as a tool to estimate distribution and timing of net infiltration out of the root zone by means of an approach that uses readily available data and minimizes user effort required to begin a SWB application. SWB calculates other components of the water balance, including soil moisture, reference and actual...
Authors
Stephen Westenbroek, John Engott, Victor Kelson, Randall Hunt
Volcanic aquifers of Hawai‘i—Hydrogeology, water budgets, and conceptual models Volcanic aquifers of Hawai‘i—Hydrogeology, water budgets, and conceptual models
Hawai‘i’s aquifers have limited capacity to store fresh groundwater because each island is small and surrounded by saltwater. Saltwater also underlies much of the fresh groundwater. Fresh groundwater resources are, therefore, particularly vulnerable to human activity, short-term climate cycles, and long-term climate change. Availability of fresh groundwater for human use is constrained...
Authors
Scot Izuka, John Engott, Kolja Rotzoll, Maoya Bassiouni, Adam Johnson, Lisa Miller, Alan Mair
Spatially distributed groundwater recharge estimated using a water-budget model for the Island of Maui, Hawai`i, 1978–2007 Spatially distributed groundwater recharge estimated using a water-budget model for the Island of Maui, Hawai`i, 1978–2007
Demand for freshwater on the Island of Maui is expected to grow. To evaluate the availability of fresh groundwater, estimates of groundwater recharge are needed. A water-budget model with a daily computation interval was developed and used to estimate the spatial distribution of recharge on Maui for average climate conditions (1978–2007 rainfall and 2010 land cover) and for drought...
Authors
Adam Johnson, John Engott, Maoya Bassiouni, Kolja Rotzoll
Geothermal implications of a refined composition-age geologic map for the volcanic terrains of southeast Oregon, northeast California, and southwest Idaho, USA Geothermal implications of a refined composition-age geologic map for the volcanic terrains of southeast Oregon, northeast California, and southwest Idaho, USA
Sufficient temperatures to generate steam likely exist under most of the dominantly volcanic terrains of southeast Oregon, northeast California, and southeast Idaho, USA, but finding sufficient permeability to allow efficient advective heat exchange is an outstanding challenge. A new thematic interpretation of existing state-level geologic maps provides an updated and refined...
Authors
Erick Burns, Marshall Gannett, David Sherrod, Mackenzie Keith, Jennifer Curtis, James Bartolino, John Engott, Benjamin Scandella, Michelle Stern, Alan Flint
Spatially distributed groundwater recharge for 2010 land cover estimated using a water-budget model for the Island of O‘ahu, Hawai‘i Spatially distributed groundwater recharge for 2010 land cover estimated using a water-budget model for the Island of O‘ahu, Hawai‘i
Owing mainly to projected population growth, demand for freshwater on the Island of Oʻahu is expected to increase by about 26 percent between 2010 and 2030, according to the City and County of Honolulu. Estimates of groundwater recharge are needed to evaluate the availability of fresh groundwater. For this study, a water-budget model with a daily computation interval was developed and...
Authors
John Engott, Adam Johnson, Maoya Bassiouni, Scot Izuka, Kolja Rotzoll
Groundwater availability in the Lahaina District, west Maui, Hawai'i Groundwater availability in the Lahaina District, west Maui, Hawai'i
Most of the public water supply in the Lahaina District, west Maui, Hawai'i, is pumped from a freshwater lens in volcanic rocks. Because of population growth, groundwater withdrawals from wells in this area are expected to increase from about 5.8 million gallons per day in 2007 to more than 11 million gallons per day by 2030. Currently (2011), the salinity of water pumped from some of...
Authors
Stephen Gingerich, John Engott
Science and Products
Regional Groundwater Availability Study of the California Coastal Basins
This study seeks to quantify water availability in the California Coastal Basins (CCBs). The CCBs vary greatly in their geologic, hydrologic, and climatic conditions; predominant water uses (agricultural, urban, or environmental); and how water availability changes in response to natural and anthropogenic stresses. Considering the complex dynamics of the CCBs and the history of managing water...
Model application data for co-developed surface watershed and groundwater hydrologic models for the Upper Colorado River Basin Model application data for co-developed surface watershed and groundwater hydrologic models for the Upper Colorado River Basin
Co-developed surface and subsurface hydrologic models for the Upper Colorado River Basin and the Colorado Plateaus principal aquifer system were used to investigate the drivers of change in hydrologic water budget components during contrasting recent wet (1982–1999) and drought (2000–2022) time periods in select headwater subregions of the Upper Colorado River Basin. The hydrologic...
GSFLOW model to extend the San Antonio Creek Integrated Model and simulate future water availability scenarios, San Antonio Creek Valley watershed, Santa Barbara County, California GSFLOW model to extend the San Antonio Creek Integrated Model and simulate future water availability scenarios, San Antonio Creek Valley watershed, Santa Barbara County, California
In the San Antonio Creek Valley Watershed (SACVW) of Santa Barbara County, California, climatic conditions, surface-water diversions, and groundwater withdrawals potentially affect water availability, magnitude of streamflow in San Antonio Creek, and the extent and quality of protected species habitat in the Barka Slough wetland. Future climate in central California may have warmer and...
Russian River Integrated Hydrologic Model (RRIHM): Watershed Data Russian River Integrated Hydrologic Model (RRIHM): Watershed Data
The Russian River Watershed (RRW) covers about 1,300 square miles (without Santa Rosa Plain) of urban, agricultural, and forested lands in northern Sonoma County and southern Mendocino County, California. Communities in the RRW depend on a combination of Russian River water and groundwater to meet their water-supply demands. Water is used primarily for agricultural irrigation, municipal...
Russian River Integrated Hydrologic Model (RRIHM): Climate Data for 1990-2015 Russian River Integrated Hydrologic Model (RRIHM): Climate Data for 1990-2015
The Russian River Watershed (RRW) covers about 1,300 square miles (without Santa Rosa Plain) of urban, agricultural, and forested lands in northern Sonoma County and southern Mendocino County, California. Communities in the RRW depend on a combination of Russian River water and groundwater to meet their water-supply demands. Water is used primarily for agricultural irrigation, municipal...
Russian River Integrated Hydrologic Model (RRIHM): Groundwater & Streamflow Observations Russian River Integrated Hydrologic Model (RRIHM): Groundwater & Streamflow Observations
The Russian River Watershed (RRW) covers about 1300 square miles (without Santa Rosa Plain) of urban, agricultural, and forested lands in northern Sonoma County and southern Mendocino County, California. Communities in the RRW depend on a combination of Russian River water and groundwater to meet their water-supply demands. Water is used primarily for agricultural irrigation, municipal...
Mean annual water-budget components for the Island of Oahu, Hawaii, for current conditions, 2001-10 rainfall and 2001-10 land cover (version 2.0) Mean annual water-budget components for the Island of Oahu, Hawaii, for current conditions, 2001-10 rainfall and 2001-10 land cover (version 2.0)
The shapefile associated with this metadata file represents the spatial distribution of mean annual water-budget components, in inches, for the Island of Oahu, Hawaii. The water-budget components in the shapefile were computed by a water-budget model for a scenario representative of current conditions (2001-10 rainfall and 2001-10 land cover), as described in USGS Scientific...
Mean annual water-budget components for the Island of Oahu, Hawaii, for predevelopment conditions, 1978-2007 rainfall and 1870 land cover (version 2.0) Mean annual water-budget components for the Island of Oahu, Hawaii, for predevelopment conditions, 1978-2007 rainfall and 1870 land cover (version 2.0)
The shapefile associated with this metadata file represents the spatial distribution of mean annual water-budget components, in inches, for the Island of Oahu, Hawaii. The water-budget components in the shapefile were computed by a water-budget model for a scenario representative of predevelopment conditions (1978-2007 rainfall and 1870 land cover), as described in USGS Scientific...
Filter Total Items: 15
Hydrologic response of groundwater and streamflow to natural and anthropogenic drivers of change in headwaters of the upper Colorado River basin during recent wet (1982–1999) and drought (2000–2022) conditions Hydrologic response of groundwater and streamflow to natural and anthropogenic drivers of change in headwaters of the upper Colorado River basin during recent wet (1982–1999) and drought (2000–2022) conditions
Study region: Headwaters of the upper Colorado River basin (UCOL), USA Study focus: Surface-water and groundwater numerical models incorporating water-use information were used to investigate changes in climate, water use, and simulated hydrologic responses of snow processes, evapotranspiration, groundwater, and streamflow during recent wet (1982–1999) and drought (2000–2022) periods in...
Authors
Fred Tillman, Melissa Masbruch, Jacob E. Knight, John Engott, Samuel Lopez, Casey Jones, Jesse Dickinson, Matthew P. Miller
Yucaipa valley integrated hydrological model Yucaipa valley integrated hydrological model
Introduction The hydrologic system in the Yucaipa Valley watershed (YVW) was simulated using the coupled Groundwater and Surface-water FLOW model (GSFLOW; Markstrom and others, 2008). This study uses version 2.0 of GSFLOW, which is a combination of the Precipitation-Runoff Modeling System (PRMS; Markstrom and others, 2015), and the Newton-Raphson formulation of the Modular Groundwater...
Authors
Ayman Alzraiee, John Engott, Geoffrey Cromwell, Linda Woolfenden
Hydrogeologic characterization of the Yucaipa groundwater subbasin Hydrogeologic characterization of the Yucaipa groundwater subbasin
Introduction Water management in the Santa Ana River watershed in San Bernardino and Riverside Counties in southern California (fig. A1) is complex with various water purveyors navigating geographic, geologic, hydrologic, and political challenges to provide a reliable water supply to stakeholders. As the population has increased throughout southern California, so has the demand for water...
Authors
Geoffrey Cromwell, John Engott, Ayman Alzraiee, Christina Stamos-Pfeiffer, Gregory Mendez, Meghan Dick, Sandra Bond
Simulation of groundwater and surface-water resources of the San Antonio Creek Valley watershed, Santa Barbara County, California Simulation of groundwater and surface-water resources of the San Antonio Creek Valley watershed, Santa Barbara County, California
In the San Antonio Creek Valley watershed (SACVW), western Santa Barbara County, California, groundwater is the primary source of water for agricultural irrigation, the town of Los Alamos, and supplemental water to Vandenberg Space Force Base (VSFB). Groundwater pumpage has increased since the 1970s as non-irrigated agricultural land has been converted to irrigated land and as local...
Authors
Linda Woolfenden, John Engott, Joshua Larsen, Geoffrey Cromwell
Hydrogeologic characterization of the San Antonio Creek Valley watershed, Santa Barbara County, California Hydrogeologic characterization of the San Antonio Creek Valley watershed, Santa Barbara County, California
The San Antonio Creek Valley watershed (SACVW) is located in western Santa Barbara County, about 15 miles south of Santa Maria and 55 miles north of Santa Barbara, California. The SACVW is about 135 square miles and encompasses the San Antonio Creek Valley groundwater basin; the SACVW is separated from adjacent groundwater basins by the Casmalia and Solomon Hills to the north, and the...
Authors
Geoffrey Cromwell, Donald Sweetkind, Jill Densmore, John Engott, Whitney Seymour, Joshua Larsen, Christopher P. Ely, Christina Stamos, Claudia C. Faunt
Numerical simulation of groundwater availability in central Moloka‘i, Hawai‘i Numerical simulation of groundwater availability in central Moloka‘i, Hawai‘i
Since the 1990s, increased chloride concentrations of water pumped from wells (much of which is used for drinking water) and the effects of withdrawals on groundwater-dependent ecosystems have led to concerns over groundwater availability on the island of Molokaʻi, Hawaiʻi. An improved understanding of the hydrologic effects of proposed groundwater withdrawals is needed to ensure...
Authors
Delwyn Oki, John Engott, Kolja Rotzoll
SWB Version 2.0—A soil-water-balance code for estimating net infiltration and other water-budget components SWB Version 2.0—A soil-water-balance code for estimating net infiltration and other water-budget components
The U.S. Geological Survey’s Soil-Water-Balance (SWB) code was developed as a tool to estimate distribution and timing of net infiltration out of the root zone by means of an approach that uses readily available data and minimizes user effort required to begin a SWB application. SWB calculates other components of the water balance, including soil moisture, reference and actual...
Authors
Stephen Westenbroek, John Engott, Victor Kelson, Randall Hunt
Volcanic aquifers of Hawai‘i—Hydrogeology, water budgets, and conceptual models Volcanic aquifers of Hawai‘i—Hydrogeology, water budgets, and conceptual models
Hawai‘i’s aquifers have limited capacity to store fresh groundwater because each island is small and surrounded by saltwater. Saltwater also underlies much of the fresh groundwater. Fresh groundwater resources are, therefore, particularly vulnerable to human activity, short-term climate cycles, and long-term climate change. Availability of fresh groundwater for human use is constrained...
Authors
Scot Izuka, John Engott, Kolja Rotzoll, Maoya Bassiouni, Adam Johnson, Lisa Miller, Alan Mair
Spatially distributed groundwater recharge estimated using a water-budget model for the Island of Maui, Hawai`i, 1978–2007 Spatially distributed groundwater recharge estimated using a water-budget model for the Island of Maui, Hawai`i, 1978–2007
Demand for freshwater on the Island of Maui is expected to grow. To evaluate the availability of fresh groundwater, estimates of groundwater recharge are needed. A water-budget model with a daily computation interval was developed and used to estimate the spatial distribution of recharge on Maui for average climate conditions (1978–2007 rainfall and 2010 land cover) and for drought...
Authors
Adam Johnson, John Engott, Maoya Bassiouni, Kolja Rotzoll
Geothermal implications of a refined composition-age geologic map for the volcanic terrains of southeast Oregon, northeast California, and southwest Idaho, USA Geothermal implications of a refined composition-age geologic map for the volcanic terrains of southeast Oregon, northeast California, and southwest Idaho, USA
Sufficient temperatures to generate steam likely exist under most of the dominantly volcanic terrains of southeast Oregon, northeast California, and southeast Idaho, USA, but finding sufficient permeability to allow efficient advective heat exchange is an outstanding challenge. A new thematic interpretation of existing state-level geologic maps provides an updated and refined...
Authors
Erick Burns, Marshall Gannett, David Sherrod, Mackenzie Keith, Jennifer Curtis, James Bartolino, John Engott, Benjamin Scandella, Michelle Stern, Alan Flint
Spatially distributed groundwater recharge for 2010 land cover estimated using a water-budget model for the Island of O‘ahu, Hawai‘i Spatially distributed groundwater recharge for 2010 land cover estimated using a water-budget model for the Island of O‘ahu, Hawai‘i
Owing mainly to projected population growth, demand for freshwater on the Island of Oʻahu is expected to increase by about 26 percent between 2010 and 2030, according to the City and County of Honolulu. Estimates of groundwater recharge are needed to evaluate the availability of fresh groundwater. For this study, a water-budget model with a daily computation interval was developed and...
Authors
John Engott, Adam Johnson, Maoya Bassiouni, Scot Izuka, Kolja Rotzoll
Groundwater availability in the Lahaina District, west Maui, Hawai'i Groundwater availability in the Lahaina District, west Maui, Hawai'i
Most of the public water supply in the Lahaina District, west Maui, Hawai'i, is pumped from a freshwater lens in volcanic rocks. Because of population growth, groundwater withdrawals from wells in this area are expected to increase from about 5.8 million gallons per day in 2007 to more than 11 million gallons per day by 2030. Currently (2011), the salinity of water pumped from some of...
Authors
Stephen Gingerich, John Engott