Reliability assessment in detention basin design

A flood detention basin is one of the structural measures used for the mitigation of floods. Its design consists of determining the required flood storage and the dimensions of bottom outlet(s) and overflow spillway. Hydraulic performance of a detention basin is dictated with the achievement of the desired degree of attenuation which is affected by storage and capacities of outlet facilities. In this paper, a reliability based model is presented for the preliminary design of flood detention basins having dual outlets using a static loading-resistance interference. In the analysis, loading and resistance of the system are assumed as the maximum lake elevation and the crest elevation of the embankment, respectively. By examining the relevant statistical information for some existing flood detention basins in Turkey, the lognormal probability density function is observed to represent the randomness of loading and resistance. Use of the model is illustrated on a case study and a set of relationships are derived among reliability, attenuation, safety factor, and return period for various entrance elevations of bottom outlet and length to crest elevation ratios of overflow spillway, With the execution of the model, various alternatives can be compared from hydraulic conformity, economy, and safety viewpoints.


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The surface drainage of an irrigation area is concerned with the collection and removal of storm runoff and excess water from irrigation applications. The engineering problem is to determine the shape, crosssectional area and slope of a stable channel. A reliability-based design, which addresses and treats possible uncertainties associated with the design parameters, is of importance as it leads to realistic decision-making. In this paper, a reliability-based assessment of erodible channel capacity based on...
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Özkaya, Arzu; Akyürek, Sevda Zuhal; Department of Civil Engineering (2017)
Floods happening due to heavy rainfall are one of the most widespread natural hazards. To predict such events, accurate rainfall products and well calibrated hydrologic models are essential especially in urban settlements for life savings. With the objective of assessing the rain detection potential of rainfall data products, several hourly rainfall datasets are used as forcing inputs in two hydrologic models. Physic based distributed model, WRF-Hydro, and conceptual based lumped model, HEC HMS, are used to...
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Çamur, Mehmet Zeki (Springer Science and Business Media LLC, 2008-02-01)
The open pit mining nearby shoreline is planned to be extended into below sea level in order to use additional reserves of the cement raw material (marl). The raw material is currently contaminated by seawater intrusion below a depth of 20 m up to the distance of 90 m from shoreline. Seawater intrusion related contamination of the material used for the cement production was investigated by means of diffusion process for the future two below sea level mining scenarios covering 43 years of period. According t...
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Avşar, Ulaş; Doyuran, Vedat; Department of Geological Engineering (2006)
Gemlik County is located in the Marmara Region (NW Turkey), which has been affected by destructive earthquakes sourced from North Anatolian Fault System throughout its history. The bulk of the settlement rests on alluvial deposits of the Gemlik pull-apart basin. So, it is vital to investigate the foundation soils in this basin and the response of them to earthquakes. Many earthquake codes were established by the authorities in different countries of the world to estimate the possible ground shaking and seis...
Citation Formats
A. M. Yanmaz, “Reliability assessment in detention basin design,” 1998, Accessed: 00, 2020. [Online]. Available: