MSMAware Computation

General Information

 

Location = Kuala Lumpur

2P24  = 100

Type of Pre-development = Park Lawns and Meadows

Type of Post-development = Semi D houses (low density)

Area = 547 m²

Impervious = 43.14 % from total area

Pervious = 56.86 % from total area

Time constant, tc = 30 minutes

Time constant, tcs = 25 minutes

OSD design = Above-ground

 

 

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

 

Step 2:- Select MSMA1 and select “General” tab.

 

Step 3:-Enter the project time value for ‘tc’ and ‘tcs. 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 2P24.

 

Step 9: Select ‘Outlets’ tab.

 

Step 10: Enter the value of ‘cd’ and ‘ho’ for primary outlet – orifice.

 

Step 11: Enter the value of ‘head over weir’, ‘free board’ and ‘Cbcw’ 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 ‘MSMA1’ button to get the full report for MSMA1

 

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

 

 

Editor :- Dilah – 26 March 14

 

 

Back : Case Study 1         Next : Manual Calculation

 

 

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