#MSMA workshop

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MSMA workshop Phone 6012-7102620

http://msmaware.com/blog/urban-stormwater-management-manual-for-malaysia-or-the-manual-saliran-mesra-alam-malaysia-msma/ Telephone call 6012 710-2620

Manual Saliran Mesra Alam (or MSMA), also known as the Urban Stormwater Management Manual for Malaysia is the stormwater drainage design procedure first issued by the Department of Irrigation and Drainage Malaysia (D.I.D) in 2000. Compliance with the requirements of MSMA when building drainage works is required by law of all engineers in Malaysia. More than ten years after its first publication, DID has completely amended the first edition of MSMA (referred to as MSMA1) with the release of the second edition (referred to as MSMA2). Based on the case studies done for Kuala Lumpur, there are a lot of alterations in the second edition including the following:

The design storm has increased by up to 125% for 10 out of the 14 rainfall stations in Kuala Lumpur. For commercial and city area, the design flow using the Rational Method has increased by up to 131%. The Site Storage Requirement for On-Site Detention for a factory site in Kuala Lumpur has increased by up to 235%, Detention pond has increased by up to 129% in the storage.

The increase 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:

Longer rainfall data covering 100 more rainfall stations in Peninsular Malaysia. This results in higher rainfall intensities for certain durations and ARI’s.

Compared to the first edition where it was divided into east and west coast of the Peninsula for the derivation of the storm temporal pattern, Peninsular Malaysia is now grouped into five regions. The changes in temporal patterns give rise to different hydrograph peaks and shapes.

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

The changes in the storm intensites, temporal patterns and the loss model used all influenced the Time-Area Method in MSMA2. For Kuala Lumpur it is noted that the storm intensities have increased and the storm temporal pattern is more peaky, thus resulting in a more peaky flow hydrograph.

The Approximate Swinburne Method in MSMA2 resulted in higher Site Storage Requirement (SSR) than the Swinburne Method in the first edition. The approximate method in MSMA2 has caused an over estimation of the SSR’s.

The storage of a detention pond has increased using MSMA2 compared to the first edition because of the increase in the storm intensities, temporal patterns and the selection of loss rate.

A software tool Is built to help engineers to carry out the computations using both editions precisely and to allow comparison be made of their changes speedily, in view of the many changes in computational methods between the first and second editions of MSMA. The tool is a stormwater design software created for MSMA. The software is developed by Ir. Dr. Quek Keng Hong- a professonal engineer in Malaysia. MSMAware also includes more than a dozen storm stations and their temporal patterns in the East Malaysian state of Sarawak.

MSMA WORKSHOP : 00:00:05 MSMA workshop 00:00:06 MSMA training 00:00:07 MSMA seminar 00:00:08 MSMA courses 00:00:09 culvert design software

MSMA workshop Phone 6012-7102620