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design rainfall software Phone 6012-7102620
http://msmaware.com/blog/msma-drainage-design-software/ Phone call 6012 710-2620
In 2000 the Department of Irrigation and Drainage Malaysia first released the stormwater drainage design procedure known as the Urban Stormwater Management Manual for Malaysia or the Manual Saliran Mesra Alam Malaysia, MSMA. Engineers in Malaysia are required legally to design drainage works to fullfil the requirements of MSMA. Eleven years after its first publication, DID has completely revised the first edition of MSMA (referred to as MSMA1) with the publication of the second edition (referred to as MSMA2). With reference to the case studies completed for Kuala Lumpur, there are numerous changes in the second edition including:
The design rainfall has gone up by up to 126% for ten out of the fourteen storm stations in Kuala Lumpur. For commercial and city area, the design discharge using the Rational Method has gone up by up to 131%. The Site Storage Requirement for OSD for a factory site in Kuala Lumpur has gone up by up to 233%, The volume 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 changes between the first and the second editions of MSMA as follows:
135 stations in Peninsular Malaysia with longer precipitation data. This gives rise to in higher storm intensities for certain durations and ARI’s.
Compared to previously where it was divided into east and west coast of the Peninsula for the determination of the rainfall temporal pattern, West Malaysia is now separated into 5 regions. The different hydrograph peaks and shapes caused by the changes in temporal patterns.
The coefficient of runoff in the Rational Method is now established according to the types of landuse, and not affected by rainfall durations and intensities, and whether a catchment is urban/rural in condition. Differences in the estimated peak discharge is observed .
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 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 Site Storage Requirements.
The volume of a detention pond has gone up using the second editon compared to MSMA1 because of the increase in the rainfall intensities, temporal patterns and the selection 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 carry out the computations using both editions precisely and to allow comparison be made of their changes speedily. The tool is a drainage design software created for MSMA. The software is created 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.
DESIGN RAINFALL SOFTWARE : 00:00:05 design rainfall software 00:00:06 drainage design software 00:00:08 Manual Saliran Mesra Alam Malaysia 00:00:10 Urban Stormwater Management Manual for Malaysia 00:00:12 Urban Stormwater Management Manual software https://www.youtube.com/watch?v=uTg8HxPhzSc
design rainfall software Phone 6012-7102620
