Development of Temporal Rainfall Pattern for Southern Region of Sarawak

Author:

A. Bustami Rosmina,Rosli Nor Azalina,Adam Jethro Henry,Pei Li Kuan

Abstract

 In the process of a design rainfall, information on rainfall duration, average rainfall intensity and temporal rainfall pattern is important. This study focuses on developing a temporal rainfall pattern for the Southern region of Sarawak since temporal pattern for Sarawak is yet to be available in the Malaysian Urban Storm Water Management Manual (MSMA), which publishes temporal pattern for design storms only for Peninsular Malaysia. The recommended technique by the Australian Rainfall and Runoff (AR&R) known as the ‘Average Variability Method’ and method in Hydrological Procedure No.1-1982 are used to derive design rainfall temporal pattern for the study. Rainfall data of 5 minutes interval from year 1998 to year 2006 for 7 selected rainfall stations in the selected region is obtained from Department of Irrigation and Drainage (DID). The temporal rainfall patterns developed are for 10 minutes,15 minutes, 30 minutes, 60 minutes, 120 minutes, 180 minutes and 360 minutes duration. The results show that Southern region of Sarawak has an exclusive rainfall pattern, which is different from the pattern developed for Peninsular Malaysia.

Publisher

UNIMAS Publisher

Subject

General Medicine

Reference9 articles.

1. [1] Rahman, A, S. M., Rahman, K., Khan, S., Shrestha, S. "A Windows-based Program to Derive Design Rainfall Temporal Patterns for Design Flood Estimation". Modeling and Simulation 2005: Modelling and Simulation Society of Australia and New Zealand Inc. 2005.

2. [2] Department of Irrigation and Drainage Malaysia. "Manual Saliran Mesra Alam Malaysia: Design Fundamentals". Malaysia, 2000, Vol (4).

3. [3] Department of Irrigation and Drainage Malaysia "Hydrological Procedure No.1: Estimation of the Design Rainstorm in Peninsular Malaysia (Revised and updated)". Malaysia. 1982.

4. [4] Bedient, P.B. and W.C. Huber, 'Hydrology and Floodplain Analysis', 3rd Ed. Prentice-Hall Publishing Co., Upper Saddle River, NJ. 2002.

5. [5] Institution of Engineers, Australia, 'Australian Rainfall and Runoff : A Guide to Flood Estimation' Eds Pilgrim, D.H., Barton, ACT. 1987.

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