|Keywords||Design discharge, flood management, ungauged basin, HEC-HMS, rainfall distribution.|
|Abstract||All stormwater management projects in Greece are required to get environmental permit before construction. The design return period is often determined by the environmental permit. Determination of design discharges is an important parameter for the design. Design discharge for a given return period is not uniquely defined and may vary considerably depending on the selection of the parameters and methodologies involved. Using a rainfall height distribution that tends to maximize the peak discharge (worst profile distribution) in essence corresponds to a lower probability of occurrence that is not quantified at present. There are publications, based on data from the US and UK that show that center-loaded storms are appropriate for design of stormwater systems. In this paper a test case study is presented. Possible variation of the estimated flood peak that can result from variation of rainfall distribution of given total height and duration is shown. Comparisons are shown between the rational method, hydrographs based on the ones given in Design of Small Dams and also with modeling with the HEC-HMS system using SCS hydrographs. Results from the HEC-HMS modeling include variation of the rainfall peak location, use of two different idf curves and SCS - Type I storm. It is seen that the same discharge value can be derived from different storm durations or different return periods depending on the rainfall distribution. Another interesting unresolved matter is the size of sub basins that should be included in modeling of hydrographs as the processes involved are not linear and the computed results may vary. It is proposed that hydrologic modeling is used including a considerable part of the drainage system of a basin and different “scenarios” of rainfall distribution and rainfall duration are used to get a feeling of the possible variations of the T-year return flood that the environmental permit describes, before more strict guidelines are adopted.|
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|Included Refrences||22 References (List...)|
|Cited by other Articles||0 Citations (List...)|
|Name||Affiliation||Home page||Total pubs|
|Daniil ΕΙ||Hydroexigiantiki, Evias 3, 15125 Maroussi, Greeceemail@example.com||2|
|Lazaridis LS||Hydroexigiantiki, Evias 3, 15125 Maroussi, Greece||4|
|Michas SN||Hydroexigiantiki, Evias 3, 15125 Marousi, Greecefirstname.lastname@example.org||7|
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