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Manual Saliran Mesra Alam Malaysia (MSMA), also known as the Urban Stormwater Management Manual for Malaysia is the urban drainage design guideline first printed by the Department of Irrigation and Drainage Malaysia (D.I.D) in 2000. It is mandatory for all engineers in Malaysia to design 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 publication of the second edition (MSMA2). There are numerous alterations in the second edition including the following (taken from case studies carried out for Kuala Lumpur):
1. The design storm has risen by up to 126% for 10 out of the fourteen rainfall stations in Kuala Lumpur.
2. The design flow using the Rational Method has risen by up to 131% for commercial and city area.
3. The Site Storage Requirement for OSD for a factory site in Kuala Lumpur has risen by up to 235%,
4. The storage volume of a detention basin has risen by up to 130%.
The increase in the values of the main design parameters as described above can be due to the changes between the first and the second editions of MSMA as follows:
1. Longer storm data covering 100 more rainfall stations in Peninsular Malaysia. This gives rise to in higher rainfall intensities for certain durations and ARI’s.
2. West Malaysia is now separated into five regions for the computation of the rainfall temporal pattern, compared to previously where it was divided into east and west coast of the Peninsula. The differences in temporal patterns give rise to different hydrograph peaks and shapes.
3. The coefficient of runoff in the Rational Method is now fixed according to the types of landuse, and not affected by storm durations and intensities, and whether a catchment is urban/rural in condition. This resulted in changes in the estimated peak flow.
4. The Time-Area Method in the second editon is affected by the changes in the storm intensites, temporal patterns and the loss model used. For Kuala Lumpur it is noticed that the storm intensities have increased and the rainfall temporal pattern is more peaky, thus resulting in a more peaky flow hydrograph.
5. The Site Storage Requirement (SSR) based on the Approximate Swinburne Method in the second editon is higher than that using the Swinburne Method in the first edition. The second editon used the approximate method based on a set of approximation tables and this has resulted in an over estimation of the Site Storage Requirements.
6. The storage volume of a detention basin has risen using the second editon compared to the first edition because of the increase in the storm intensities, temporal patterns and the choice of loss rate.
In view of the many changes in computational procedures between the first and second editions of MSMA, a tool is developed to help engineers to perform the computations using both editions accurately and to allow comparison be made of their changes speedily. The tool is a urban drainage design software developed for MSMA. The software is developed 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 storm stations and their temporal patterns are programmed into the software.
IDF CURVE : 00:00:05 IDF Curve 00:00:06 MSMA 00:00:07 drainage design guideline 00:00:08 Manual Saliran Mesra Alam Malaysia 00:00:09 Urban Stormwater Management Manual for Malaysia
IDF Curve Ph 6012-7102620












