Develop Intensity Duration Frequency (IDF) curve for Kuala Lumpur / Nelmond None

The Intensity Duration Frequency (IDF) curve represent a given non-exceedence probability in terms of the maximum annual rainfall intensity with the time interval length. Usually, for a given return period, the IDF is found to be highest intensity at early duration and the intensity will decrease as the duration increase. The IDF curve is one of the most commonly used tools in any project related to the water resources engineering including planning, designing, operating of water resources project and also used in the protection of various engineering projects against flood. The IDF relationship is derived using the analysis of the annual maximum series and the Gumbel (EV1) distribution is used in the analysis. Method of Moment is applied as the parameter estimator of the Gumbel distribution. The purpose of this study is to develop IDF curve for Kuala Lumpur for 2,5,10,20,50 and 100 year return period and then to make a comparison with existing developed IDF curve in this area. For this purpose, 3 rainfall stations located in Federal Territory of Kuala Lumpur has been used in this study i.e. Genting Sempah, Kg. Sungai Tua and Kg. Kuala Sleh. Existing IDF curve developed by MASMA were found to be higher compared to the newly developed IDF curve with the average percentage difference of ±20.03 % but the difference due to difference in the data used, length of record and the methodology.