MSMA Phone 6012 710 2620

http://ift.tt/1RH3cu1 Call (6012)-7102620 Manual Saliran Mesra Alam Malaysia (MSMA), or the Urban Stormwater Management Manual for Malaysia is the urban drainage design standard 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 system to comply with the requirements of MSMA. 11 years after its first publication, DID has completely amended 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 (based on case studies carried out for Kuala Lumpur): 1. The design rainfall 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 site 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 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: 1. Longer precipitation data covering 100 more storm stations in Peninsular Malaysia. This gives rise to in higher rainfall intensities for certain durations and ARI's. 2. West Malaysia is now grouped 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 determined according to the types of landuse, and not dependent on rainfall durations and intensities, and whether a catchment is urban/rural in condition. This gives rise to changes in the estimated peak discharge. 4. The Time-Area Method in MSMA2 is affected by the changes in the rainfall intensites, temporal patterns and the loss model used. For Kuala Lumpur it is noticed that the rainfall intensities have increased and the rainfall temporal pattern is more peaky, thus giving rise to 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 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 SSR's. 6. The storage of a detention basin has gone up using MSMA2 compared to the first edition because of the increase in the rainfall 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 carry out the computations using both editions accurately and to allow comparison be made of their changes speedily. The tool is a stormwater design software designed for MSMA. The software is developed by Ir. Dr. Quek Keng Hong- a professonal engineer in Malaysia. MSMAware also covers the East Malaysian state of Sarawak where more than a dozen rainfall stations and their temporal patterns are included into the software. MSMA : 00:00:05 MSMA 00:00:05 drainage design guideline 00:00:06 Manual Saliran Mesra Alam Malaysia 00:00:07 Urban Stormwater Management Manual for Malaysia 00:00:07 Urban Stormwater Management Manual MSMA Phone 6012 710 2620
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