Detention Basin Computation in MSMA (2000)

 

 

Sample Data

Site Detail 

Location : Federal Territory, Kuala Lumpur
Area : 10 Ha
2P24 : 100 mm
Tc Pre : 30 min
 Tc Post : 15 min

 

Outlet Selected 

Type : Orifice
Numbers : 1
Cd : 0.6
 Do : 1 m
 Invert level : 0 m

 

Time Area Method Design 

Pre Situation
Initial losses for pervious : 10 mm
Initial losses for impervious : 1.5 mm
Continuous losses for pervious : 20mm/hr
Continuous losses for impervious : 0mm/hr
Percentage pervious : 100%
Percentage impervious : 0%
Separation of site catchment : 5000 m2, 10000 m2, 17000 m2, 25000 m2, 28000 m2, 15000 m2

 

Post situation
Initial losses for pervious : 10 mm
Initial losses for impervious : 1.5 mm
Continuous losses for pervious : 20 mm/hr
Continuous losses for impervious : 0 mm/hr
Percentage pervious : 30 %
Percentage impervious : 70%

 

Detention Basin Design 

ARI for Pre : 5 year, 50 year and 100 year
ARI for Post : 5 year, 50 year and 1000 year
Tc Pre : 15 min, 30 min, 60 min
Tc Post : 15 min, 30 min, 60 min
Detention Basin Area : 6000 m2, 7000 m2, 8000 m2, 9000 m2, 10000 m2, 11000 m2, 12000 m2, 13000 m2, 14000 m2, 15000 m2
Contour interval depth : 0.15 m
Max depth : 3.0 m
Invert level : 0 m
Free board : 0.3 m
No of contour lines : 10
Pool routing time step : 1 min
Factor to Tc : 4

 

 

Back: Case Study 2 using Time Area Method

Next: MSMAware computation

 


 

 

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