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http://msmaware.com/blog/enquiry-about-msmaware-software/ Phone 6012 710-2620

Manual Saliran Mesra Alam Malaysia (MSMA), or the Urban Stormwater Management Manual for Malaysia is the urban drainage design procedure first printed by the Department of Irrigation and Drainage Malaysia (D.I.D) in 2000. It is required by law for all engineers in Malaysia to design drainage works to fullfil the requirements of MSMA. Eleven years after its first publication, DID has completely updated the first edition of MSMA (MSMA1) with the publishing of the second edition (MSMA2). There are numerous differences in the second edition include (taken from case studies completed for Kuala Lumpur):

1. The design storm has gone up by up to 126% for 10 out of the fourteen rainfall stations in Kuala Lumpur.

2. The design discharge using the Rational Method has gone up by up to 131% for commercial and city area.

3. The Site Storage Requirement for On-Site Detention for a factory lot in Kuala Lumpur has gone up by up to 235%,

4. The storage of a detention basin has gone up by up to 130%.

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

1. Longer rainfall data covering 100 more stations in Peninsular Malaysia. This gives rise to in higher rainfall intensities for certain durations and Average Recurrence Intervals.

2. Peninsular Malaysia is now separated into five regions for the determination 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 dissimilar hydrograph peaks and shapes.

3. The coefficient of runoff in the Rational Method is now set 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 discharge.

4. The Time-Area Method in MSMA2 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 discharge hydrograph.

5. The Site Storage Requirement (SSR) based on the Approximate Swinburne Method in MSMA2 is higher than that using the Swinburne Method in MSMA1. The second editon used the approximate method based on a set of approximation tables and this has resulted in an over estimation of the SSR’s.

6. The storage of a detention basin has gone up using MSMA2 compared to MSMA1 because of the increase in the storm intensities, temporal patterns and the choice of loss rate.

In view of the many changes in computational methods between the first and second editions of MSMA, a tool is developed to help engineers to carry out the computations using both editions precisely and to allow comparison be made of their changes speedily. The tool is a urban drainage design software created for MSMA. The software is created 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 included into the software.

0SD : 00:00:05 0SD 00:00:06 detention pond 00:00:07 detention basin 00:00:08 design storm 00:00:09 design rainfall