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首页> 美国政府科技报告 >Urban Storm Runoff in the Roseburg Area, Oregon, as Related to Urban FloodCharacteristics of the Willamette Valley
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Urban Storm Runoff in the Roseburg Area, Oregon, as Related to Urban FloodCharacteristics of the Willamette Valley

机译：俄勒冈州罗斯堡地区的城市暴雨径流与威拉米特河谷的城市洪水特征有关

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Techniques are provided for estimating flood magnitudes for streams in theurbanized parts of the Roseburg, Oregon area for exceedance probabilites (recurrence intervals) of 0.5 (2-year), 0.2 (5-year), 0.1 (10-year), 0.04 (25-year), 0.02 (50-year) and and 0.01 (100-year). A network of four continuous-recording streamflow gages, three crest-stage gages, and six precipitation gages was established and operated for a 3-year period (1982 to 1984). A U.S. Geological Survey rainfall-runoff model was calibrated for each site where runoff was measured and was used to produce a series of synthetic flood peaks. These series of flood peaks are based on pan-evaporation records from Canby, Oregon, and long-term unit rainfall records from Portland, Oregon. Flood statistics were computed for these synthetic series. The report presents an analysis of data collected in and near Roseburg, Oregon, and compares these results with findings of previous studies in the Willamette Valley. Specifically, regression equations from previous studies were tested for transferability and reliability in estimating urban flood-peak discharges in the Roseburg area.

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