Flood frequency analysis for annual peak discharges records in an urban drainage basin

چکیده مقاله

In this study, amounts of peak discharge and frequency of floods in the urban watershed are investigated. A framework for flood frequency analysis is based on the Regional equations for estimating, 1, 2, 5, 10, 20, 25, 50, 100, 500, 1000 and 10000-year flood-peak discharges were calculated on unregulated streams in Kermanshah plain of Iran. Flood-frequency estimates determined for 4 stream flow-gaging stations in the study area. Special mathematical functions were considered aiming flow-frequency relation by statistical analysis of the series of recorded annual maximum flows and finding an appropriate distribution with use Minimum chi-squared tests. Values of explanatory variables used in the method were determined from digital spatial data sets by means of a geographic information system (GIS), which was determined by digitizing the area within basin boundaries manually delineated on topographic maps. The results shown 2-parameter gamma distribution and Gamble distribution were fit distribution on estimating flood-frequency characteristics.

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