detention basin software Ph 6012)-7102620

http://ift.tt/1NIkZgy Call 6012-710-2620 The urban 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 (or MSMA). Engineers in Malaysia are required legally to build drainage works to fullfil the requirements of MSMA. More than ten years after its first publication, DID has completely revised the first edition of MSMA (or MSMA1) with the release of the second edition (or MSMA2). Based on the case studies carried out for Kuala Lumpur, there are many alterations in the second edition including: 10 out of the fourteen rainfall stations in Kuala Lumpur have its design storm increased by up to 125%. For commercial and city area, the design flow using the Rational Method has increased by up to 130%. For a factory lot in Kuala Lumpur the Site Storage Requirement for OSD has increased by up to 235%. The volume of a detention pond has increased by up to 130%. The changes between the first and the second editions of MSMA resulted the increase in the magnitudes of the main design parameters as follows: 135 stations in Peninsular Malaysia with longer storm data. This gives rise to in higher rainfall 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 temporal pattern, Peninsular Malaysia is now divided into five regions. The changes in temporal patterns give rise to dissimilar hydrograph peaks and shapes. The coefficient of runoff in the Rational Method is now established according to the types of landuse, and not influenced by storm durations and intensities, and whether a catchment is urban/rural in condition. This gives rise to changes in the estimated peak flow. The Time-Area Method in MSMA2 is affected by the changes in the storm intensites, temporal patterns and the loss model used. The storm intensities for Kuala Lumpur have increased and the temporal pattern is more peaky, resulting in a more peaky flow hydrograph. The Site Storage Requirement (SSR) based on the Approximate Swinburne Method in MSMA2 is higher than that using the Swinburne Method in MSMA1. The approximate method in MSMA2 has given rise to an over estimation of the Site Storage Requirements. The volume of a detention pond has increased using MSMA2 compared to MSMA1 because of the increase in the storm 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 perform the computations using both editions accurately and to allow comparison be made of their changes quickly. A stormwater design software has been designed for MSMA. The software is written 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 storm stations and their temporal patterns are included into the software. DETENTION BASIN SOFTWARE : 00:00:05 detention basin software 00:00:06 design storm software 00:00:08 design rainfall software 00:00:10 drainage design software 00:00:12 Manual Saliran Mesra Alam Malaysia detention basin software Ph (6012)-7102620
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