MSMA Ph 6012 710-2620

http://ift.tt/1jypUc5 Call 6012-7102620 Manual Saliran Mesra Alam Malaysia (MSMA), or the Urban Stormwater Management Manual for Malaysia is the urban drainage design standard first released by the Department of Irrigation and Drainage Malaysia (D.I.D) in 2000. It is compulsory 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 changes in the second edition including the following (based on case studies completed for Kuala Lumpur): 1. The design rainfall has increased by up to 126% for 10 out of the 14 rainfall stations in Kuala Lumpur. 2. The design flow using the Rational Method has increased 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 increased by up to 235%, 4. The volume of a detention basin has increased by up to 130%. The increase in the values of the main design parameters as outlined above can be due to the changes between the first and the second editions of MSMA as follows: 1. Longer rainfall data covering 100 more rainfall stations in Peninsular Malaysia. This results in higher rainfall intensities for certain durations and Average Recurrence Intervals. 2. Peninsular Malaysia is now grouped into five regions for the derivation of the storm 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 affected by rainfall 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 rainfall intensites, temporal patterns and the loss model used. For Kuala Lumpur it is noticed that the rainfall intensities have increased and the storm 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 MSMA1. MSMA2 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 volume of a detention basin has increased using the second editon compared to MSMA1 because of the increase in the rainfall 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 accurately and to allow comparison be made of their changes quickly. The tool is a stormwater design software designed for MSMA. The software is developed by Ir. Dr. Quek Keng Hong- a practising engineer in Malaysia. MSMAware also covers the East Malaysian state of Sarawak where more than a dozen rainfall stations and their temporal patterns are programmed into the software. MSMA : 00:00:05 MSMA 00:00:06 drainage design guideline 00:00:07 Manual Saliran Mesra Alam Malaysia 00:00:08 Urban Stormwater Management Manual for Malaysia 00:00:09 Urban Stormwater Management Manual MSMA Ph 6012 710-2620
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