Computation of probable maximum precipitation for upper Rajang river basin, Sarawak
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 flo...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
Universiti Malaysia Sarawak, (UNIMAS)
2014
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/9100/1/Computation%20of%20Probable%20Maximum%20Precipitation%20For%20Upper%20Rajang%20River%20Basin%2C%20Sarawak%20%2824pgs%29.pdf http://ir.unimas.my/id/eprint/9100/8/Marina%20Patrick%20ft.pdf http://ir.unimas.my/id/eprint/9100/ |
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| Summary: | 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. |
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