Development of Rainfall Intensity-Duration-Frequency (RIDF) curve and design storm hyetographs for Los Baños, Laguna, Philippines

Date

12-2015

Degree

Bachelor of Science in Agricultural and Biosystems Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Maurice A. Duka

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

This study aimed to develop Rainfall-Intensity-Duration-Frequency (RIDF) curve and design storm hyetographs for Los Baños, Laguna, Philippines. RIDF curve and storm hyetographs are two of the most commonly used tools in water resources engineering, either for planning, designing or operating of various projects against floods. RIDF curves were developed based on the frequency analyses of annual maximum rainfall intensities at specified duration selected from 23 years of tipping bucket rainfall records. Frequency analyses utilized normal, log normal, log Pearson III and Gumbel distributions. The curves show that normal and Gumbel are the best fit distributions whereas log normal and log Pearson III tend to overestimate rainfall intensities at higher return periods. Design hyetographs were established using alternating block and Huff methods. For the alternating block, PAG-ASA?s RIDF, actual generated RIDF and actual normalized 24-hour rainfall pattern were used. The normalized 24-hour rainfall pattern was derived from the selected extreme 24-hour storms for specific months. Meanwhile, Huff method utilized the selected 24-hour storms and divided it further into four types of distribution. It was determined that there is a significant difference between the peak values of all design hyetographs. This difference is due to the peak value of the normalized 24-hour storm (based on the individual total maximum depth) that is relatively high. Moreover, the peak value of actual generated RIDF is comparably higher than PAG-ASA but has no significant difference.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2015 A2 /A73

Document Type

Thesis

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