Abstract:
The rainfall Intensity Duration Frequency (IDF) relationship is one of the most commonly
used tools in water resources engineering for planning, designing or operation of water
resources projects. The establishment of such relationship was done in 1932. Since then,
many sets of relationships have been developed in different parts of the globe. In the present
paper rainfall dada of 14 raingauge stations of Punpun basin located in Bihar was taken for
regional rainfall frequency analysis based on L-moment approach facilitated to find the robust
distribution for these daily raingauge stations having data availability of 9-17 years. The
robust distribution was used to find the IDF relationship and curves for short duration rainfall
for Punpun basin. From the IDF curves parameters of empirical equations for the gauged
locations were determined and contour maps were generated. IDF curves for ungauged
locations were developed from the generated contour maps using GIS and finally a generalized
IDF curve incorporating return period and the duration of rainfall for particular station was
developed.
