Adam Stonewall
Hydrologist in the Oregon Water Science Center. With Portland Field Office since 2001. B.S. in hydrology from the University of Arizona. M.S. in forest hydrology from the University of British Columbia. Thesis was “The Use of Monte-Carlo Simulations in the Detection of Nonstationarity in Peak-Annual Flood Time Series of British Columbia.”
Biography
My background is primarily in flood frequency analysis. I also have strong interest and/or experience in statistical testing for nonstationarity, climate change, monte-carlo simulations and nonparametric statistics.
Science and Products
Effects of Highway Runoff on Water Quality
"SELDM facilitates analysis by providing precipitation, pre-storm streamflow, and other variables by region or from hydrologically similar sites."
Johnson Creek Basin Hydrologic Monitoring Study
The USGS provides hydrologic data for the Johnson Creek Basin. Real-time surface-water, water-quality and groundwater data, as well as historic data and analyses, help to improve our understanding of the hydrology of the basin.
Development of regional skew coefficients for selected flood durations in the Columbia River Basin, northwestern United States and British Columbia, Canada
Flood-frequency (hereinafter frequency) estimates provide information used to design, operate, and maintain hydraulic structures such as bridges and dams. Failures of these structures could cause catastrophic loss of property, life, or both. In addition to frequency estimates that use annual peak streamflow, frequency estimates of flood durations...
Lind, Greg D.; Lamontagne, Jonathan R.; Stonewall, Adam J.
Evaluation of restoration alternatives using hydraulic models of lake outflow at Wapato Lake National Wildlife Refuge, northwestern Oregon
Wapato Lake National Wildlife Refuge near the city of Gaston in northwestern Oregon was established in 2013, and planning is underway to restore a more natural lake and wetland system after more than 100 years of agricultural activity on the lakebed. Several water-management and restoration alternatives are under consideration, one of which...
Rounds, Stewart A.; Pilson, Stephen L.; Sullivan, Annett B.; Stonewall, Adam J.
Assessing potential effects of highway and urban runoff on receiving streams in total maximum daily load watersheds in Oregon using the stochastic empirical loading and dilution model
The Stochastic Empirical Loading and Dilution Model (SELDM) was developed by the U.S. Geological Survey (USGS) in cooperation with the Federal Highway Administration to simulate stormwater quality. To assess the effects of runoff, SELDM uses a stochastic mass-balance approach to estimate combinations of pre-storm...
Stonewall, Adam J.; Granato, Gregory E.; Glover-Cutter, Kira M.
Assessing roadway contributions to stormwater flows, concentrations, and loads with the StreamStats application
The Oregon Department of Transportation (ODOT) and other state departments of transportation need quantitative information about the percentages of different land cover categories above any given stream crossing in the state to assess and address roadway contributions to water-quality impairments and resulting total maximum daily loads. The U.S....
Stonewall, Adam; Granato, Gregory E.; Haluska, Tana
Preliminary flood-duration frequency estimates using naturalized streamflow records for the Willamette River Basin, Oregon
In this study, “naturalized” daily streamflow records, created by the U.S. Army Corps of Engineers and the Bureau of Reclamation, were used to compute 1-, 3-, 7-, 10-, 15-, 30-, and 60-day annual maximum streamflow durations, which are running averages of daily streamflow for the number of days in each duration. Once the annual maximum durations...
Lind, Greg D.; Stonewall, Adam J.
Hydrogeologic framework and selected components of the groundwater budget for the upper Umatilla River Basin, Oregon
Executive SummaryThis report presents a summary of the hydrogeology of the upper Umatilla River Basin, Oregon, based on characterization of the hydrogeologic framework, horizontal and vertical directions of groundwater flow, trends in groundwater levels, and components of the groundwater budget. The conceptual model of the groundwater flow system...
Herrera, Nora B.; Ely, Kate; Mehta, Smita; Stonewall, Adam J.; Risley, John C.; Hinkle, Stephen R.; Conlon, Terrence D.
Developing flood-inundation maps for Johnson Creek, Portland, Oregon
Digital flood-inundation maps were created for a 12.9‑mile reach of Johnson Creek by the U.S. Geological Survey (USGS). The flood-inundation maps depict estimates of water depth and areal extent of flooding from the mouth of Johnson Creek to just upstream of Southeast 174th Avenue in Portland, Oregon. Each flood-inundation map is based on a...
Stonewall, Adam J.; Beal, Benjamin A.
Evaluation of flood inundation in Crystal Springs Creek, Portland, Oregon
Efforts to improve fish passage have resulted in the replacement of six culverts in Crystal Springs Creek in Portland, Oregon. Two more culverts are scheduled to be replaced at Glenwood Street and Bybee Boulevard (Glenwood/Bybee project) in 2016. Recently acquired data have allowed for a more comprehensive understanding of the hydrology of the...
Stonewall, Adam; Hess, Glen
Development of a CE-QUAL-W2 temperature model for Crystal Springs Lake, Portland, Oregon
During summer 2014, lake level, streamflow, and water temperature in and around Crystal Springs Lake in Portland, Oregon, were measured by the U.S. Geological Survey and the City of Portland Bureau of Environmental Services to better understand the effect of the lake on Crystal Springs Creek and Johnson Creek downstream. Johnson Creek is listed as...
Buccola, Norman L.; Stonewall, Adam J.
Simulations of a hypothetical temperature control structure at Detroit Dam on the North Santiam River, northwestern Oregon
Water temperature models of Detroit Lake, Big Cliff Lake, and the North Santiam River in northwestern Oregon were used to assess the potential for a hypothetical structure with variable intake elevations and an internal connection to power turbines at Detroit Dam (scenario SlidingWeir) to release more natural, pre-dam temperatures year round...
Buccola, Norman L.; Stonewall, Adam J.; Rounds, Stewart A.
Development of a HEC-RAS temperature model for the North Santiam River, northwestern Oregon
A one-dimensional, unsteady streamflow and temperature model (HEC-RAS) of the North Santiam and Santiam Rivers was developed by the U.S. Geological Survey to be used in conjunction with previously developed two-dimensional hydrodynamic water-quality models (CE-QUAL-W2) of Detroit and Big Cliff Lakes upstream of the study area. In conjunction with...
Stonewall, Adam J.; Buccola, Norman L.
Comparison of historical streamflows to 2013 Streamflows in the Williamson, Sprague, and Wood Rivers, Upper Klamath Lake Basin, Oregon
In 2013, the Upper Klamath Lake Basin, Oregon, experienced a dry spring, resulting in an executive order declaring a state of drought emergency in Klamath County. The 2013 drought limited the water supply and led to a near-total cessation of surface-water diversions for irrigation above Upper Klamath Lake once regulation was implemented. These...
Hess, Glen W.; Stonewall, Adam J.