Urban Stormwater Management Manual training Call 6012 710-2620

Urban Stormwater Management Manual training Call 6012 710-2620

http://msmaware.com/blog/urban-stormwater-management-manual-for-malaysia-software-program/
Call 6012-710-2620

The urban drainage design standard first printed by the Department of Irrigation and Drainage Malaysia in 2000 is the Urban Stormwater Management Manual or the Manual Saliran Mesra Alam (or MSMA). Compliance with the requirements of MSMA when building drainage works is required legally of all engineers in Malaysia. More than ten years after its first publication, DID has completely revised the first edition of MSMA (or MSMA1) with the publishing of the second edition (or MSMA2). With reference to the case studies done for Kuala Lumpur, there are numerous changes in the second edition including:

Ten out of the 14 rainfall stations in Kuala Lumpur have its design storm increased by up to 126%.
For commercial and city area, the design discharge using the Rational Method has increased by up to 130%.
The Site Storage Requirement for On-Site Detention for a factory site in Kuala Lumpur has increased by up to 234%,
The storage volume of a detention pond has increased by up to 130%.

The differences between the first and the second editions of MSMA give rise to the increase in the values of the main design parameters as follows:

Longer storm data covering 100 more storm stations in Peninsular Malaysia. This results in higher rainfall intensities for certain durations and ARI's.

West Malaysia is now separated into five regions for the derivation of the temporal pattern, compared to the first edition where it was divided into east and west coast of the Peninsula. The differences in temporal patterns give rise to dissimilar hydrograph peaks and shapes.

Not dependent on storm 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. Differences in the estimated peak discharge is observed .

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 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 the first edition. The approximate method in the second editon has resulted in an over estimation of the SSR's.

The storage volume of a detention pond has increased using the second editon compared to the first edition because of the increase in the storm intensities, temporal patterns and the selection of loss rate.

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 carry out the computations using both editions precisely and to allow comparison be made of their differences speedily. A urban drainage design software has been created 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.





Urban Stormwater Management Manual training Call 6012 710-2620








https://www.youtube.com/watch?v=zlgZeffO90c