#culvert analysis program

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culvert analysis program Phone 6012)-7102620

http://msmaware.com/blog/msma-software/ Ph 6012-7102620

The Urban Stormwater Management Manual for Malaysia or the Manual Saliran Mesra Alam (MSMA) is the stormwater drainage design standard first released by the Department of Irrigation and Drainage Malaysia in early 2000. Fullfilment of the requirements of MSMA when building drainage works is required by law of all engineers in Malaysia. The Department of Irrigation and Drainage has completely revised the first edition of MSMA (or MSMA1) with the release of the second edition (or MSMA2) about 11 years after its first edition. There are numerous alterations in the second edition including (taken from case studies done for Kuala Lumpur):

10 out of the 14 rainfall stations in Kuala Lumpur have its design rainfall risen by up to 124%. For commercial and city area, the design discharge using the Rational Method has risen by up to 130%. For a factory site in Kuala Lumpur the Site Storage Requirement for On-Site Detention has risen by up to 234%. The storage volume of a detention pond has risen by up to 130%.

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

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

Compared to the first edition where it was divided into east and west coast of the Peninsula for the determination of the storm temporal pattern, West Malaysia is now separated 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 determined 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 changes in the rainfall intensites, temporal patterns and the loss model used all affected the Time-Area Method in the second editon. For Kuala Lumpur it is noted that the rainfall intensities have increased and the storm temporal pattern is more peaky, thus resulting in a more peaky discharge hydrograph.

The Approximate Swinburne Method in the second editon gives higher Site Storage Requirement (SSR) than the Swinburne Method in the first edition. MSMA2 used the approximate method based on a set of approximation tables and this has resulted in an over estimation of the SSR’s.

The storage volume of a detention pond has risen using the second editon compared to the first edition because of the increase in the rainfall intensities, temporal patterns and the choice 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. A stormwater design software is 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 rainfall stations and their temporal patterns are included into the software.

CULVERT ANALYSIS PROGRAM : 00:00:05 culvert analysis program 00:00:06 On-Site Detention Software 00:00:07 OSD software 00:00:08 detention pond software 00:00:09 detention basin software