REGIONAL APPROACHES TO FLOOD FREQUENCY ANALYSIS

Abstract

The estimation of flood frequency quantiles is an important aspect in planning and design of hydraulic structures for arriving at the design floods. For this, the flood frequency analysis is used to estimate the floods of desired return periods at a project location. It requires a long record of historical flood peaks at the project site. However, in some cases, the records available at site are either too scanty or the observed data are, not, available at all*. In such situations, regional flood frequency approaches are resorted to by making the use of observed flood data or adjoining or some other hydro-meteorologically similar basins. Several flood frequency methods are available in the literature. However, it has been observed that in most of the field organisations one or two of these approaches are used frequently. But the other approaches available do have their merits over the conventional ones. In view of this, the study aims at, present..ing the various regional flood frequency analysis approaches, and their methodologies and to demonstrate their applicability through an analysis of, a real-lifesituation...