Sensitivity Analysis of Location Specific Constants of IDF Equation for Nanded, Hingoli and Jalna

Sensitivity analysis of location specific constants of rainfall intensity – duration – frequency (IDF) relationship for Nanded, Hingoli and Jalna locations of Marathwada region was performed under present project. The IDF relationship of locations, Nanded, Hingoli and Jalna were considered for the present study. The location-specific constants of IDF equations considered, were varied within a range of -50% to +50%, with an interval of 5%. Only one constant was varied at a time while keeping the other three constants unchanged, for preparation of data sets. Rainfall intensity was calculated for the different combinations of rainfall duration and return period. The rainfall duration was considered from 0.25h to 3h with an interval of 0.25h. The return period was considered from 5 years to 25 years with an interval of 5 years. Sensitivity analysis was performed by calculating Sensitivity ratio(S) and Relative Sensitivity ratio (Sr) for different combinations of rainfall duration and return period along with the intensity for 3 locations. The values of Sensitivity ratio and Relative Sensitivity ratio for four location specific constants were observed to be equal. Hence, the significant difference was checked between the two ratios using Student t- test. Based on values of S and Sr, location specific constants were classified as Highly Sensitive (HS), Moderately Sensitive (MS), Less Sensitive (LS) and Very Less Sensitive (VLS). The very less sensitivity category was considered as non-sensitivity interval.