Urban Stormwater Management Manual for Malaysia Tel 6012)-7102620

http://ift.tt/1MXX7sS Phone 6012 710 2620 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 Malaysia (MSMA). Engineers in Malaysia are required legally to build drainage works to comply with the requirements of MSMA. 11 years after its first publication, DID has completely updated the first edition of MSMA (MSMA1) with the release of the second edition (MSMA2). Taken from the case studies completed for Kuala Lumpur, there are numerous changes in the second edition include: ten out of the fourteen storm stations in Kuala Lumpur have its design rainfall gone up by up to 126%. The design discharge using the Rational Method has gone up by up to 131% for commercial and city area. The Site Storage Requirement for On-Site Detention for a factory site in Kuala Lumpur has gone up by up to 235%, The storage of a detention pond has gone up by up to 130%. The increase in the values of the main design parameters as described above can be due to the differences between the first and the second editions of MSMA as follows: Longer rainfall data covering 100 more storm stations in Peninsular Malaysia. This gives rise to in higher storm intensities for certain durations and Average Recurrence Intervals. Compared to previously where it was divided into east and west coast of the Peninsula for the computation of the rainfall temporal pattern, West Malaysia is now separated into five regions. The differences in temporal patterns give rise to different hydrograph peaks and shapes. Not dependent on rainfall durations and intensities, and whether a catchment is urban/rural in condition, the coefficient of runoff in the Rational Method is now set according to the types of landuse. This gives rise to differences in the estimated peak discharge. The Time-Area Method in the second editon is affected by the differences in the rainfall intensites, temporal patterns and the loss model used. For Kuala Lumpur it is noted that the rainfall intensities have increased and the rainfall temporal pattern is more peaky, thus giving rise to a more peaky discharge hydrograph. 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. Compared to MSMA1, the increase in the rainfall intensities, temporal patterns and the choice of loss rate have resulted a rise in the storage of a detention pond using MSMA2. In view of the many differences in computational methods between the first and second editions of MSMA, a tool is developed to help engineers to perform the computations using both editions accurately and to allow comparison be made of their differences quickly. The tool is a urban drainage design software designed for MSMA. The software is written by Ir. Dr. Quek Keng Hong- a practising professional 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. URBAN STORMWATER MANAGEMENT MANUAL FOR MALAYSIA : 00:00:05 Urban Stormwater Management Manual for Malaysia 00:00:06 Urban Stormwater Management Manual software 00:00:08 Urban Stormwater Management Manual training 00:00:09 Department of Irrigation and Drainage Malaysia 00:00:11 MSMA2 Urban Stormwater Management Manual for Malaysia Tel (6012)-7102620
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