Computation of probable maximum precipitation for upper Rajang river basin, Sarawak

Patrick, Marina (2014) Computation of probable maximum precipitation for upper Rajang river basin, Sarawak. Masters thesis, Universiti Malaysia Sarawak, (UNIMAS).

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Abstract

Developments of mega dam projects that are thriving in Sarawak particularly in the Upper Rajang River Basin may not only bring great prospects to this region, but could also cause irreversible destruction. Dam failures have always been associated with devastating floods. Correspond to maximum flood potential used for the safety of the dam spillway design is the Probable Maximum Precipitation (PMP). Therefore, this study attempted to estimate and analyse the PMP for different rainfall stations within Upper Rajang River Basin using the statistical approach and prepare the spatial distribution for 1-day areal PMP. The amount of subjectivity in PMP estimations can be minimized, and consistent results for any location can be achieved with this research. Comparisons of the PMP estimates based on the statistical approach of Hershfield (1965) were analysed with the PMP values computed using the National Hydraulic Research Institute of Malaysia (NAHRIM) Technical Research Publication No. 1 (TRP 1: 2008) manual, and the Conventional method of the statistical approach. The results obtained by these methods were then compared with hydrological studies by Sarawak Electricity Supply Cooperation, SESCO (1983). It was found that PMP estimates by NAHRIM (2008) is conservative and may not be feasible; Hershfield method can produce reasonable PMP estimates and is valid for subsequent design calculations; Conventional method is comparable to the Hershfield method and have produced more conservative results by performing quick statistical analysis. When PMP estimates achieved from each method was validated with the estimates by SESCO (1983), the closest value was from the Hershfield method. All three methods discussed have proven to be useful for PMP estimations when practiced vigilantly. Hence, the use of statistical approach is deeming acceptable for computation of PMP estimates.

Item Type: Thesis (Masters)
Additional Information: Thesis (M.Eng.) -- Universiti Malaysia Sarawak, 2014.
Uncontrolled Keywords: Upper Rajang River Basin, Probable Maximum Precipitation (PMP), Precipitation (Chemistry), unimas, university, universiti, Borneo, Malaysia, Sarawak, Kuching, Samarahan, ipta, education, Postgraduate, research, Universiti Malaysia Sarawak
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QD Chemistry
Divisions: Academic Faculties, Institutes and Centres > Faculty of Engineering
Depositing User: Karen Kornalius
Date Deposited: 08 Oct 2015 00:52
Last Modified: 16 Mar 2020 01:46
URI: http://ir.unimas.my/id/eprint/9100

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