UMP Institutional Repository

The development of intensity duration frequency (IDF) curves in Gombak

Aida Zahirah, Zurhaini (2019) The development of intensity duration frequency (IDF) curves in Gombak. Faculty of Civil Engineering and Earth Resources, Universiti Malaysia Pahang.

[img]
Preview
Pdf
The development of intensity duration frequency (IDF).pdf - Accepted Version

Download (728kB) | Preview

Abstract

Changing in climate is one of the main parameter that affecting the water resources as it affects the whole hydrologic cycle thus causes variation in rainfall intensity, duration and frequency of precipitation. The study is about development of Intensity Duration Frequency (IDF) curves in Gombak. IDF curve is one of the most commonly used all engineers, developers and contractors to design storm, hydraulic and hydrology structure. The IDF curves in Manual Saliran Mesra Alam (MSMA 2) only updated until year 2012 and covered limited location only. The aim of this study is to developed IDF curves with and without outlier by using Lognormal distribution and Gumbel distribution in Gombak. The Annual Maximum Series (AMS) of rainfall data were collected from Department of Irrigation and Drainage (DID). It consists of eleven rainfall stations. The methods that were used to determine the outlier of IDF curves are U.S. Water Resource Council (1981) and Interquartile Range (IQR). It is clearly shows the greater removal of outliers for Annual Maximum Series (AMS) rainfall data was by using Interquartile Range rather than U.S. Water Resource Council (1981) due to discrepancies between 75th and 25th percentiles that measure the dispersion of statistical study. Lognormal distribution and Gumbel distribution are the methods that were used to develop IDF curves. Based on the analysis, the percentage difference between IDF curves with and without outlier for Lognormal distribution are within 0% to 21.6% while for Gumbel distribution are within 0% to 24.7%. It can be concluded that the percentage of difference between IDF curves with and without outlier using Gumbel distribution is greater than using Lognormal distribution. According to the output, it shows the greater removal of outliers will produce higher percentage of difference (%).

Item Type: Undergraduates Project Papers
Additional Information: Project Paper (Bachelors of Civil Engineering) -- Universiti Malaysia Pahang – 2019, SV: MADAM SHAIRUL ROHAZIAWATI BINTI SAMAT, NO. CD: 12636
Uncontrolled Keywords: Intensity duration frequency (IDF); rainfall
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
T Technology > TC Hydraulic engineering. Ocean engineering
Faculty/Division: Faculty of Civil Engineering & Earth Resources
Depositing User: Mrs. Sufarini Mohd Sudin
Date Deposited: 27 Oct 2020 10:55
Last Modified: 27 Oct 2020 10:55
URI: http://umpir.ump.edu.my/id/eprint/29791
Download Statistic: View Download Statistics

Actions (login required)

View Item View Item