Urban Stormwater Management Manual for Malaysia Tel 6012)-7102620

Urban Stormwater Management Manual for Malaysia Tel (6012)-7102620

http://msmaware.com/blog/msma-software/
Call 6012 710-2620

The urban drainage design standard first published by the Department of Irrigation and Drainage Malaysia in 2000 is the Urban Stormwater Management Manual for Malaysia or the Manual Saliran Mesra Alam Malaysia (MSMA). Fullfilment of the requirements of MSMA when designing drainage system is required by law of all engineers in Malaysia. Eleven years after its first publication, DID has completely updated the first edition of MSMA (MSMA1) with the publishing of the second edition (MSMA2). There are numerous alterations in the second edition including the following (based on case studies done for Kuala Lumpur):

ten out of the fourteen storm stations in Kuala Lumpur have its design rainfall increased by up to 126%.
For commercial and city area, the design discharge using the Rational Method has increased by up to 131%.
The Site Storage Requirement for OSD for a factory site in Kuala Lumpur has increased by up to 235%,
The storage of a detention pond has increased by up to 130%.

The hike in the magnitudes of the main design parameters as outlined above can be attributed to the differences between the first and the second editions of MSMA as follows:

135 storm stations in Peninsular Malaysia with longer rainfall data. This results in higher storm intensities for certain durations and ARI's.

Peninsular Malaysia is now divided into five regions for the determination of the rainfall 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 affected by rainfall durations and intensities, and whether a catchment is urban/rural in condition, the coefficient of runoff in the Rational Method is now determined according to the types of landuse. This resulted in differences in the estimated peak discharge.

The Time-Area Method in the second editon is affected by the differences in the rainfall intensites, temporal patterns and the loss model used. For Kuala Lumpur it is noticed that the rainfall intensities have increased and the rainfall temporal pattern is more peaky, thus resulting in 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. The approximate method in the second editon has caused an over estimation of the SSR's.

The storage of a detention pond has increased using the second editon compared to MSMA1 because of the increase in the rainfall intensities, temporal patterns and the choice of loss rate.

In view of the many differences 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 accurately and to allow comparison be made of their differences quickly. The tool is a stormwater design software designed for MSMA. The software is created by Ir. Dr. Quek Keng Hong- a practising professional engineer in Malaysia. MSMAware also contains more than a dozen rainfall stations and their temporal patterns in the East Malaysian state of Sarawak.

















Urban Stormwater Management Manual for Malaysia Tel (6012)-7102620













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

Manual Saliran Mesra Alam Malaysia Tel 6012-7102620

Manual Saliran Mesra Alam Malaysia Tel 6012-7102620
http://www.youtube.com/watch?v=KcO5a_DbJj4

Intensity Frequency Duration Call 6012-710-2620

Intensity Frequency Duration Call 6012-710-2620
http://www.youtube.com/watch?v=vHYqvUMWzWY

Manual Saliran Mesra Alam Malaysia Tel 6012-7102620

Manual Saliran Mesra Alam Malaysia Tel 6012-7102620

http://msmaware.com/blog/msma-urban-stormwater-management-manual-for-malaysia-training-seminars-workshops-and-software/
Phone 6012-710-2620

In 2000 the Department of Irrigation and Drainage Malaysia first printed the urban drainage design guideline known as the Urban Stormwater Management Manual for Malaysia or the Manual Saliran Mesra Alam Malaysia, MSMA. It is compulsory for all engineers in Malaysia to build drainage works to comply with the requirements of MSMA. 11 years after its first publication, DID has completely revised the first edition of MSMA (MSMA1) with the release of the second edition (MSMA2). With reference to the case studies completed for Kuala Lumpur, there are a lot of alterations in the second edition include:

For Kuala Lumpur it was found that the design rainfall has risen by up to 126% for ten out of the 14 storm stations.
The design flow using the Rational Method has risen by up to 131% for commercial and city area.
The Site Storage Requirement for OSD for a factory site in Kuala Lumpur has risen by up to 235%,
Detention basin has risen by up to 130% in the volume.

The hike in the values of the main design parameters as outlined above can be attributed to the differences between the first and the second editions of MSMA as follows:

135 storm stations in Peninsular Malaysia with longer precipitation data. The storm intensities for most Average Recurrence Intervals have increased.

Compared to the first edition where it was divided into east and west coast of the Peninsula for the determination of the temporal pattern, West Malaysia is now separated into five regions. The different hydrograph peaks and shapes caused by the differences in temporal patterns.

The coefficient of runoff in the Rational Method is now set 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 flow is observed .

The differences in the rainfall intensites, temporal patterns and the loss model used all influenced the Time-Area Method in MSMA2. For Kuala Lumpur it is noticed that the rainfall intensities have increased and the temporal pattern is more peaky, thus giving rise to a more peaky flow hydrograph.

The Approximate Swinburne Method in MSMA2 gives higher Site Storage Requirement (SSR) than the Swinburne Method in MSMA1. The approximate method in MSMA2 has resulted in an over estimation of the SSR's.

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

A software program Is built to assist engineers to perform the computations using both editions accurately and to allow comparison be made of their differences speedily, in view of the many differences in computational procedures between the first and second editions of MSMA. The tool is a drainage design software developed for MSMA. The software is programmed by Ir. Dr. Quek Keng Hong- a practising professional 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.

















Manual Saliran Mesra Alam Malaysia Tel 6012-7102620













https://www.youtube.com/watch?v=KcO5a_DbJj4

Rational Method Ph 6012-7102620

Rational Method Ph 6012-7102620

http://msmaware.com/blog/get-free-msma-newsletter/


Call 6012-710-2620





Manual Saliran Mesra Alam Malaysia (MSMA), or the Urban Stormwater Management Manual for Malaysia is the urban drainage design procedure first distributed by the Department of Irrigation and Drainage Malaysia (D.I.D) in 2000. It is compulsory for all engineers in Malaysia to build drainage works to comply with the requirements of MSMA. 11 years after its first publication, DID has completely updated the first edition of MSMA (MSMA1) with the release of the second edition (MSMA2). There are many changes in the second edition include (taken from case studies completed for Kuala Lumpur):





1. The design storm has risen by up to 126% for 10 out of the 14 storm stations in Kuala Lumpur.





2. The design flow using the Rational Method has gone up by up to 131% for commercial and city area.





3. The Site Storage Requirement for On-Site Detention for a factory lot in Kuala Lumpur has risen by up to 235%,





4. The storage volume of a detention basin has gone up by up to 130%.





The rise in the magnitudes of the main design parameters as outlined above can be due to the differences between the first and the second editions of MSMA as follows:





1. Longer precipitation data covering 100 more rainfall stations in Peninsular Malaysia. This gives rise to in higher storm intensities for certain durations and ARI's.





2. West Malaysia is now grouped into 5 regions for the determination of the storm temporal pattern, compared to previously 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.





3. The coefficient of runoff in the Rational Method is now fixed according to the types of landuse, and not dependent on storm durations and intensities, and whether a catchment is urban/rural in condition. This resulted in differences in the estimated peak flow.





4. The Time-Area Method in MSMA2 is affected by the differences in the storm intensites, temporal patterns and the loss model used. For Kuala Lumpur it is noted that the storm intensities have increased and the storm temporal pattern is more peaky, thus giving rise to a more peaky flow hydrograph.





5. The Site Storage Requirement (SSR) based on the Approximate Swinburne Method in MSMA2 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.





6. The storage volume of a detention basin has risen 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 differences in computational procedures 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 quickly. The tool is a drainage design software created for MSMA- which is known as the MSMAware. The software is developed by Ir. Dr. Quek Keng Hong who is a practising professional engineer in Malaysia. MSMAware also covers the East Malaysian state of Sarawak where more than a dozen storm stations in the state and their temporal patterns are included into the software.

















Rational Method Ph 6012-7102620










https://www.youtube.com/watch?v=XsDR9mTovKI