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

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

http://msmaware.com/blog/manual-saliran-mesra-alam-malaysia-msma-software-program-tool/
Phone (6012)710 2620

The Urban Stormwater Management Manual for Malaysia or the Manual Saliran Mesra Alam (MSMA) is the urban drainage design procedure first released by the Department of Irrigation and Drainage Malaysia in early 2000. It is compulsory for all engineers in Malaysia to build drainage system to comply with the requirements of MSMA. The Department of Irrigation and Drainage has completely referred to as the first edition of MSMA (or MSMA1) with the publication of the second edition (known as MSMA2) about Eleven years after its first edition. Based on the case studies completed for Kuala Lumpur, there are a lot of differences in the second edition including the following:

10 out of the 14 rainfall stations in Kuala Lumpur have its design rainfall gone up by up to 125%.
The design flow using the Rational Method has gone up by up to 131% for commercial and city area.
For a factory lot in Kuala Lumpur the Site Storage Requirement for OSD has gone up by up to 233%.
Detention basin has gone up by up to 128% in the storage volume.

The changes between the first and the second editions of MSMA give rise to the hike in the values of the main design parameters below:

135 stations in Peninsular Malaysia with longer rainfall record. This results in higher rainfall intensities for certain durations and Average Recurrence Intervals.

West Malaysia is now separated into 5 regions for the computation of the rainfall temporal pattern, compared to the first edition where it was divided into east and west coast of the Peninsula. The different hydrograph peaks and shapes caused by the changes in temporal patterns.

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 established according to the types of landuse. Changes in the estimated peak flow is observed .

The changes in the rainfall intensites, temporal patterns and the loss model used all influenced the Time-Area Method in MSMA2. The rainfall intensities for Kuala Lumpur have increased and the rainfall temporal pattern is more peaky, resulting in a more peaky flow hydrograph.

The Approximate Swinburne Method in MSMA2 gives 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 Site Storage Requirements.

Compared to MSMA1, the increase in the rainfall intensities, temporal patterns and the selection of loss rate have resulted a rise in the storage volume of a detention basin using MSMA2.

A software tool Is developed to help engineers to carry out the computations using both editions accurately and to allow comparison be made of their changes quickly, due to the many changes in computational methods between the first and second editions of MSMA. The tool is a urban drainage design software designed 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 included into the software.


https://www.youtube.com/watch?v=zlgZeffO90c
https://www.youtube.com/watch?v=zlgZeffO90c
https://www.youtube.com/watch?v=zlgZeffO90c
Department of Irrigation and Drainage Malaysia Ph Call (6012)710 2620








https://www.youtube.com/watch?v=61AgP_ky_9E