Department of Irrigation and Drainage Malaysia Ph Call 6012)710 2620

http://ift.tt/1MSLe3T Phone call 6012-710-2620 The stormwater drainage design standard first released by the Department of Irrigation and Drainage Malaysia in 2000 is the Urban Stormwater Management Manual or the Manual Saliran Mesra Alam (referred to as MSMA). Fullfilment of the requirements of MSMA when designing drainage works is required legally of all engineers in Malaysia. More than ten years after its first publication, DID has completely amended the first edition of MSMA (referred to as MSMA1) with the publication of the second edition (referred to as MSMA2). There are a lot of alterations in the second edition include (taken from case studies completed for Kuala Lumpur): 10 out of the 14 storm stations in Kuala Lumpur have its design storm risen by up to 124%. The design flow using the Rational Method has risen by up to 129% for commercial and city area. For a factory lot in Kuala Lumpur the Site Storage Requirement for On-Site Detention has risen by up to 233%. The volume of a detention pond has risen by up to 129%. The differences between the first and the second editions of MSMA resulted the hike in the magnitudes of the main design parameters below: Longer rainfall data covering 100 more storm stations in Peninsular Malaysia. This results in higher storm intensities for certain durations and Average Recurrence Intervals. Compared to the first edition where it was divided into east and west coast of the Peninsula for the determination of the storm temporal pattern, Peninsular Malaysia is now grouped into 5 regions. The different hydrograph peaks and shapes due to the differences in temporal patterns. The coefficient of runoff in the Rational Method is now fixed 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 differences in the estimated peak flow. The Time-Area Method in the second editon is affected by the differences 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 giving rise to a more peaky flow hydrograph. The Approximate Swinburne Method in the second editon resulted in higher Site Storage Requirement (SSR) than 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 storm intensities, temporal patterns and the choice of loss rate have given rise to a rise in the volume 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 precisely and to allow comparison be made of their differences speedily. The tool is a urban drainage design software designed for MSMA. Ir. Dr. Quek Keng Hong- a practising professional engineer in Malaysia is the programmer of the software. 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. DEPARTMENT OF IRRIGATION AND DRAINAGE MALAYSIA : 00:00:05 Department of Irrigation and Drainage Malaysia 00:00:06 MSMA2 00:00:07 MSMA software 00:00:08 MSMA workshop 00:00:09 MSMA training https://www.youtube.com/watch?v=zlgZeffO90c Department of Irrigation and Drainage Malaysia Ph Call (6012)710 2620
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