Manual Saliran Mesra Alam Malaysia Call 6012 710 2620

http://ift.tt/1RH3cu1 Ph 6012 710-2620 Manual Saliran Mesra Alam Malaysia (MSMA), or in English the Urban Stormwater Management Manual for Malaysia is the urban drainage design procedure first issued by the Department of Irrigation and Drainage Malaysia (D.I.D) in 2000. It is compulsory 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 (MSMA1) with the publishing of the second edition (MSMA2). There are numerous changes in the second edition include (taken from case studies done for Kuala Lumpur): 1. The design storm has risen by up to 126% for 10 out of the 14 storm stations in Kuala Lumpur. 2. The design discharge using the Rational Method has risen by up to 131% for commercial and city area. 3. The Site Storage Requirement for OSD for a factory site in Kuala Lumpur has risen by up to 235%, 4. The storage of a detention basin has risen by up to 130%. The increase in the magnitudes of the main design parameters as described above can be due to the changes between the first and the second editions of MSMA as follows: 1. Longer storm data covering 100 more stations in Peninsular Malaysia. This gives rise to in higher storm intensities for certain durations and ARI's. 2. West Malaysia is now divided into five regions for the computation 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 influenced 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 the second editon 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 storm 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 the second editon 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 Site Storage Requirements. 6. The storage of a detention basin has risen using the second editon compared to the first edition because of the increase in the storm 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 perform the computations using both editions precisely and to allow comparison be made of their changes quickly. The tool is a stormwater design software developed for MSMA. The software is programmed 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 storm stations and their temporal patterns are included into the software. MANUAL SALIRAN MESRA ALAM MALAYSIA : 00:00:05 Manual Saliran Mesra Alam Malaysia 00:00:06 Urban Stormwater Management Manual for Malaysia 00:00:07 Urban Stormwater Management Manual 00:00:08 Department of Irrigation and Drainage Malaysia 00:00:09 MSMA2 Manual Saliran Mesra Alam Malaysia Call 6012 710 2620
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