Hydrology of the Johnson Creek Basin, Oregon

Lee, Karl K.; Snyder, Daniel T.

doi:10.3133/sir20095123

Cited by 12 publications

(14 citation statements)

References 9 publications

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“…Unusual snow melts quickly during subsequent rain storms (Lee and Snyder, 2009). Therefore, the surface hydrology of these regions is highly dominated by frequent rainfall.…”

Section: Study Area and Datamentioning

confidence: 99%

Quantifying uncertainty in urban flooding analysis considering hydro-climatic projection and urban development effects

Jung

Chang

Moradkhani

2011

Hydrol. Earth Syst. Sci.

104

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Abstract. How will the combined impacts of land use change, climate change, and hydrologic modeling influence changes in urban flood frequency and what is the main uncertainty source of the results? Will such changes differ by catchment with different degrees of current and future urban development? We attempt to answer these questions in two catchments with different degrees of urbanization, the Fanno catchment with 84% urban land use and the Johnson catchment with 36% urban land use, both located in the Pacific Northwest of the US. Five uncertainty sources -general circulation model (GCM) structures, future greenhouse gas (GHG) emission scenarios, land use change scenarios, natural variability, and hydrologic model parameters -are considered to compare the relative source of uncertainty in flood frequency projections. Two land use change scenarios, conservation and development, representing possible future land use changes are used for analysis. Results show the highest increase in flood frequency under the combination of medium high GHG emission (A1B) and development scenarios, and the lowest increase under the combination of low GHG emission (B1) and conservation scenarios. Although the combined impact is more significant to flood frequency change than individual scenarios, it does not linearly increase flood frequency. Changes in flood frequency are more sensitive to climate change than land use change in the two catchments for 2050s . Shorter term flood frequency change, 2 and 5 year floods, is highly affected by GCM structure, while longer term flood frequency change above 25 year floods is dominated by natural variability. Projected flood frequency changes more significantly in Johnson creek than Fanno creek. This result indicates that, under expected Correspondence to: H. Chang (changh@pdx.edu) climate change conditions, adaptive urban planning based on the conservation scenario could be more effective in less developed Johnson catchment than in the already developed Fanno catchment.

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“…Unusual snow melts quickly during subsequent rain storms (Lee and Snyder, 2009). Therefore, the surface hydrology of these regions is highly dominated by frequent rainfall.…”

Section: Study Area and Datamentioning

confidence: 99%

Quantifying uncertainty in urban flooding analysis considering hydro-climatic projection and urban development effects

Jung

Chang

Moradkhani

2011

Hydrol. Earth Syst. Sci.

104

View full text Add to dashboard Cite

show abstract

“…About 30 percent of the watershed is covered by impervious surfaces (U.S. Geological Survey, 2011a). More information about the hydrology, hydrogeology, and land use of the Johnson Creek basin, including a list of previous investigations in and around the watershed, can be found in Snyder (2008) and Lee and Snyder (2009).…”

Section: Description Of Study Areamentioning

confidence: 99%

“…As streamflow decreases, the proportion of streamflow originating upstream of Gresham also decreases and reaches a low of 10 percent in August, the month typically with the least amount of streamflow in the year. The decrease in streamflow upstream from Gresham relative to overall streamflow in Johnson Creek is a result of Crystal Springs Creek, which flows into Johnson Creek between Sycamore and Milwaukie and provides a relatively stable source of base flow throughout the year (Lee and Snyder, 2009 …”

Section: Spatial Distribution Of Streamflowmentioning

confidence: 99%

Suspended-sediment characteristics for the Johnson Creek basin, Oregon, water years 2007-10

Stonewall¹,

Bragg²

2012

Scientific Investigations Report

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“…Crystal Springs Lake is fed primarily by spring flow (Lee and Snyder, 2009) that might include water from springs originating underneath the lake. At least seven springs originate east or south of the lake and flow into the lake as surface water ( fig.…”

Section: Background Study Areamentioning

confidence: 99%

Hydrology of the Johnson Creek Basin, Oregon

Cited by 12 publications

References 9 publications

Quantifying uncertainty in urban flooding analysis considering hydro-climatic projection and urban development effects

Quantifying uncertainty in urban flooding analysis considering hydro-climatic projection and urban development effects

Suspended-sediment characteristics for the Johnson Creek basin, Oregon, water years 2007-10

Development of a CE-QUAL-W2 temperature model for Crystal Springs Lake, Portland, Oregon

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