Theme-3-1-Flood estimation using regional flood frequency analysis.

Abstract

Annual flood peak series at 93 stations located all over India have been analysed. Out of the various frequency distributions available, it is found that GEV type I fits the data more closely. It is then found that flood with return period 2.33 yr (Q 2.33) is related to catchment area A, catchment slope S, percent area covered by Forest AF and P, where, P is 2 yr; 45mt, 3 hr, 6 hr or 24 hr rainfall depending on A/S value. It is also found that the coefficient of variation of flood series is related to coefficient of variation of maximum monthly rainfall series in the catchment.