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The stormwater drainage design standard first issued by the Department of Irrigation and Drainage Malaysia in 2000 is the Urban Stormwater Management Manual for Malaysia or the Manual Saliran Mesra Alam (known as MSMA). It is mandatory for all engineers in Malaysia to build drainage system to fullfil the requirements of MSMA. Eleven years after its first publication, DID has completely amended the first edition of MSMA (known as MSMA1) with the publishing of the second edition (known as MSMA2). There are a lot of alterations in the second edition include (taken from case studies done for Kuala Lumpur):
For Kuala Lumpur it was found that the design storm has gone up by up to 126% for ten out of the 14 storm stations. The design discharge using the Rational Method has gone up by up to 130% for commercial and city area. The Site Storage Requirement for On-Site Detention for a factory lot in Kuala Lumpur has gone up by up to 235%, Detention pond has gone up by up to 128% in the storage volume.
The increase in the magnitudes of the main design parameters as described above can be attributed to the differences between the first and the second editions of MSMA as follows:
135 stations in Peninsular Malaysia with longer rainfall record. The storm intensities for most ARI’s have increased.
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 dissimilar hydrograph peaks and shapes due to the differences in temporal patterns.
Not affected by storm durations and intensities, and whether a catchment is urban/rural in condition, the coefficient of runoff in the Rational Method is now determined according to the types of landuse. This resulted in differences in the estimated peak discharge.
The Time-Area Method in MSMA2 is affected by the differences in the storm intensites, temporal patterns and the loss model used. The storm intensities for Kuala Lumpur have increased and the storm temporal pattern is more peaky, giving rise to a more peaky discharge hydrograph.
The Site Storage Requirement (SSR) based on the Approximate Swinburne Method in MSMA2 is higher than that using the Swinburne Method in MSMA1. The approximate method in MSMA2 has given rise to an over estimation of the SSR’s.
Compared to MSMA1, the increase in the storm intensities, temporal patterns and the selection of loss rate have resulted an increase in the storage volume of a detention pond using MSMA2.
A software tool Is built to assist engineers to perform the computations using both editions accurately and to allow comparison be made of their differences speedily, due to the many differences in computational methods between the first and second editions of MSMA. A drainage design software has been created for MSMA. The software is created by Ir. Dr. Quek Keng Hong- a practising engineer in Malaysia. MSMAware also covers more than a dozen storm stations and their temporal patterns in the Sarawak.
OSD SOFTWARE : 00:00:05 OSD software 00:00:06 detention pond software 00:00:08 detention basin software 00:00:10 design storm software 00:00:12 design rainfall software
OSD software Call 6012-710-2620