Manual Saliran Mesra Alam Malaysia Tel 6012-7102620

Manual Saliran Mesra Alam Malaysia Tel 6012-7102620

http://msmaware.com/blog/msma-urban-stormwater-management-manual-for-malaysia-training-seminars-workshops-and-software/
Phone 6012-710-2620

In 2000 the Department of Irrigation and Drainage Malaysia first printed the urban drainage design guideline known as the Urban Stormwater Management Manual for Malaysia or the Manual Saliran Mesra Alam Malaysia, MSMA. It is compulsory for all engineers in Malaysia to build drainage works to comply with the requirements of MSMA. 11 years after its first publication, DID has completely revised the first edition of MSMA (MSMA1) with the release of the second edition (MSMA2). With reference to the case studies completed for Kuala Lumpur, there are a lot of alterations in the second edition include:

For Kuala Lumpur it was found that the design rainfall has risen by up to 126% for ten out of the 14 storm stations.
The design flow using the Rational Method has risen by up to 131% for commercial and city area.
The Site Storage Requirement for OSD for a factory site in Kuala Lumpur has risen by up to 235%,
Detention basin has risen by up to 130% in the volume.

The hike in the values of the main design parameters as outlined above can be attributed to the differences between the first and the second editions of MSMA as follows:

135 storm stations in Peninsular Malaysia with longer precipitation data. The storm intensities for most Average Recurrence Intervals have increased.

Compared to the first edition where it was divided into east and west coast of the Peninsula for the determination of the temporal pattern, West Malaysia is now separated into five regions. The different hydrograph peaks and shapes caused by the differences in temporal patterns.

The coefficient of runoff in the Rational Method is now set according to the types of landuse, and not affected by rainfall durations and intensities, and whether a catchment is urban/rural in condition. Differences in the estimated peak flow is observed .

The differences in the rainfall intensites, temporal patterns and the loss model used all influenced the Time-Area Method in MSMA2. For Kuala Lumpur it is noticed that the rainfall intensities have increased and the temporal pattern is more peaky, thus giving rise to a more peaky flow hydrograph.

The Approximate Swinburne Method in MSMA2 gives higher Site Storage Requirement (SSR) than the Swinburne Method in MSMA1. The approximate method in MSMA2 has resulted in an over estimation of the SSR's.

Compared to MSMA1, the increase in the rainfall intensities, temporal patterns and the selection of loss rate have given rise to a rise in the volume of a detention basin using MSMA2.

A software program Is built to assist engineers to perform the computations using both editions accurately and to allow comparison be made of their differences speedily, in view of the many differences in computational procedures between the first and second editions of MSMA. The tool is a drainage design software developed for MSMA. The software is programmed by Ir. Dr. Quek Keng Hong- a practising professional engineer in Malaysia. MSMAware also covers the East Malaysian state of Sarawak where more than a dozen rainfall stations and their temporal patterns are programmed into the software.

















Manual Saliran Mesra Alam Malaysia Tel 6012-7102620













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