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.”
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
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 L.
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.
Development of CE-QUAL-W2 models for the Middle Fork Willamette and South Santiam Rivers, Oregon
Hydrodynamic (CE-QUAL-W2) models of Hills Creek Lake (HCL), Lookout Point Lake (LOP), and Dexter Lake (DEX) on the Middle Fork Willamette River (MFWR), and models of Green Peter Lake and Foster Lake on the South Santiam River systems in western Oregon were updated and recalibrated for a wide range of flow and meteorological conditions. These CE-...Buccola, Norman L.; Stonewall, Adam J.; Sullivan, Annett B.; Kim, Yoonhee; Rounds, Stewart A.
Suspended-sediment characteristics for the Johnson Creek basin, Oregon, water years 2007-10
Significant Findings An analysis of suspended-sediment transport in the Johnson Creek basin, Oregon, during water years 2007–10 indicated that: Streamflow characteristics for the 4 years of study were not extremely dry or wet, and represented near-average conditions. Computed average annual suspended-sediment loads were 1,890 and 4,640 tons...Stonewall, Adam J.; Bragg, Heather M.
Development of an Environmental Flow Framework for the McKenzie River Basin, Oregon
The McKenzie River is a tributary to the Willamette River in northwestern Oregon. The McKenzie River is approximately 90 miles in length and has a drainage area of approximately 1,300 square miles. Two major flood control dams, a hydropower dam complex, and two hydropower canals significantly alter streamflows in the river. The structures reduce...Risley, John; Wallick, J. Rose; Waite, Ian; Stonewall, Adam J.
Estimating Flow-Duration and Low-Flow Frequency Statistics for Unregulated Streams in Oregon
Flow statistical datasets, basin-characteristic datasets, and regression equations were developed to provide decision makers with surface-water information needed for activities such as water-quality regulation, water-rights adjudication, biological habitat assessment, infrastructure design, and water-supply planning and management. The flow...Risley, John; Stonewall, Adam J.; Haluska, Tana