MSMAware Computation

General Information


Location = Kuala Lumpur

Station = SK Taman Maluri

Project development = Banglow low density

Terrain = Mild


Project size =3500

Impervious area = 70% from total area

Pervious area = 30% from total area


Time concentration

= 10 minutes

= 5 minutes


OSD design = Below-ground storage



Step 1: Start MSMAware. Select ‘On-Site Detention’ tab.


Step 2:- Select ESM and select “General” tab.


Step 3:-Enter the project time value for and . Make sure the time is in ‘minutes’ units.


Step 4: Choose the design ARI for project storage.


Step 5: Enter the ‘impervious area’ and ‘pervious area’ for ‘pre’ and ‘post’ data. Make sure that the area is in ‘meter squared’ unit.


Step 6: Select the earth cover categories for ‘Pre’ and ‘Post’ development. If the C value is fixed, then choose true. Select ‘False’ if the C value is not fix value.


Step 7: Select the general type for the storage development.


Step 8: Select the type for ‘Town’ and ‘Location’ of the site project. Insert the value for .


Step 9: Select ‘Outlets’ tab.


Step 10: Enter the value of and for primary outlet – orifice.


Step 11: Enter the value of ‘head over weir’, ‘free board’ and for ‘secondary outlet-weir’.


Step 12: Click “Run” button.


Step 13: The result will be shown in the ‘calculation tab’. The value of orifice size and weir size will automatically calculate.


Step 14: Click ‘ESM’ button to get the full report for ESM.


Step 15: Full report On Site Detention is shown as bellow.



Editor :- Dilah – 27 March 14



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