Detention Basin Computation in MSMA (2011)

 

Sample data

Site Detail

Location : Air Terjun Sungai Batu, Kuala Lumpur
Area : 10 Ha
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 : 20 mm/hr
Continuous losses for impervious : 0 mm/hr
Percentage pervious : 100 %
Percentage impervious : 0 %
Separation of site area : 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
Continuous losses for impervious : 0 mm/hr
Percentage pervious : 30 %
Percentage impervious : 70 %

 

Detention Basin Design

ARI for Pre : 5 year, 50 year, 100 year
ARI for Post : 5 year, 50 year, 100 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

 

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