Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 102 for “"Drainage area"”.
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A study of flash floods on a small drainage area
… investigation was made of that point of the drainage area above the Blacksburg depot of the Norfolk and Western Railroad. The capacities of both the culvert on Eakia Street and the channel above Eakia Street were determined by calculations, and an opinion based on the review of observed data …
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Development of a regional curve to relate discharge and drainage area to hydraulic geometry for the Red River of the North Basin
… streams with lmown hydraulic geometry and drainage area. Hydraulic geometry data were collected in the field for twenty-five stream gage sites in the Red River of the North Basin. Recurrence intervals for bankfull ranged from 1.2 to 1.6 years, with an average recurrence interval of 1.4. …
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Data-driven analyses of watersheds as coupled human-nature systems
… quantitatively linking natural and anthropogenic drainage area characteristics to flow frequency and measures of ecological health using data mining techniques. The fact that drainage area characteristics for watersheds in the U.S. are known (in the case of ungauged watersheds) or readily …
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Systematic oversteepening in longitudinal profiles of mixed bedrock-alluvial channels at tributary junctions : Appalachians, Virginia
… channel gradients at tributary junctions. Where drainage area increased, channel slopes were either increasing or remaining constant. Subsequent investigation of 10m resolution digital elevation models found this pattern to be widespread throughout several large nearby drainage basins (A …
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Modeling Intermittent and Perennial Headwater Stream Origins In North Carolina.
… ranging from a univariate model based on drainage area to models including geomorphometric and physiographic variables. Current models are often based solely on a threshold of drainage area, or variables derived from a Digital Elevation Model (DEM) such as drainage area and slope. The …
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Pollution aspects derived from non-point sources
… The Town of Blacksburg, Virginia, was the area of study with eleven sampling sites determined by size of drainage area and dominant land use existing within the drainage basin. Concentrations of specific water pollution parameters were measured for the runoff from each drainage area. …
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Nutrient Sources and Transport in the Central Region of the Big Sioux River, South Dakota
… Big Sioux River, Six Mile-North Deer Creek, and Drainage M. The Big Sioux River transported 418,640 x 10 3 m3 of water, 776,880 kg TP, 599,590 kg TON, and 5,419,580 kg TOC during the study-year. Six Mile Creek transported 23,900 x 10 3 m 3 of water, 52,040 kg TP, 43,580 kg TON, and 327,860 kg of …
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Origin and Transport of Nutrients in the Upper Big Sioux River, South Dakota
… of nutrients in the Big Sioux River. The area was divided into three segments. Two of the segments, the Big Sioux River and Willow Creek Basins, were primarily agricultural drainage areas, and one segment was the city of Watertown. Sampling stations were selected to facilitate the …
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Hillslope evolution in response to lateral base level migration
… An expected relationship between geometric drainage area and channel growth velocity was not borne out in the data, but the distribution of measured v/K ratios is consistent with what I expect based on my preferential sampling of slow-moving gently-sloped heads. Several explanations are …
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Development and analysis of computer aided design and drafting software for storm sewers
… package uses AutoCAD to enter storm sewer data. Drainage areas, sewer line locations, type of structures, and all other hydrologic parameters can be entered. The software also creates plan and profile drawings of the storm sewer system through AutoCAD. There are other unique features. The …
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Using Digital Methods to Reconstruct Original Topography and Landscape Wetness in the Judicial Ditch 66 Watershed, Polk County, Minnesota
… was subsequently divided into four parts. First, drainage area and its potential wetness were estimated using the 10 meter U.S. Geological Survey Digital Elevation Model (DEM). The ln(a/tan β) potential wetness index is used, which is directly related to drainage area. Second, points representing …
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Analysis of an Urban Stormwater Bioretention Management Practice in Prince William County, Virginia
… an upland forest habitat. Typical bioretention areas utilize shallow ponding and highly-infiltrative sandy soils to treat the stormwater runoff from small commercial or residential drainage sites. The Kingsbrooke bioretention area was found to be atypical in several ways, including its …
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Basin-scale spatiotemporal analysis of hydrologic floodplain connectivity
… by developing a metric that included inundation area and duration. Long-term hydrographs at each reach in the watershed were developed via QPPQ (Flow-Percentile-Percentile-Flow) methodology using regional regression analysis to calculate the ungauged flow duration curves (FDC). Inundation area …
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Simulação hidrológica de bacias urbanas
… das Pedras Watershed in Guanabara State, with drainage area of 24.88 km2 and about 400.000 inhabitants.
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Constraints on passive margin escarpment evolution from river basin reorganization in Brazil
… retreat rates. I also estimate the percentage of drainage area exchanged by stream capture as the escarpment drainage divide moves across the landscape. Using two different estimation methods, I find that less than 40% of drainage area is exchanged by stream capture, making divide migration the …
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A New Method for Determining Average Reservoir Pressure from a Single Well Buildup Test
… reservoir pressure without prior knowledge of drainage area shapes. To sUbstantiate the accuracy of the model, test runs were made on regularly shaped reservoirs for which the solutions to the pressure function are known. The resulting comparisons were favorable. The model was then applied to …
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