System Specifications
*Feet cannot be bigger than inches
Inlet Elevation*
(ft & in)
Outlet or Infiltration Bed Elevation*
(ft & in)
Type of System (Detention or Retention)
Void = Void Ratio
(%)
V(det) = Volume required for detention
(cfs)
Controlling Dimensions for System Layout
L(trench) = Trench Length
(feet)
Nheader = Number of Headers
t = Bedding Thickness
(inches)
d = Distance of trench sidewall (1.5’ typical)
(feet)
Maximum Pipe Diameter
*System size could be increased by size of inlet pipe
Dmax = Inlet Elevation - Outlet Elevation
(feet)
Dmax
(inches)
Use Diameter - (OD)
(inches)
SC = Storage Capacity
(cfs/lf)
s = Center to Center Pipe Spacing
(inches)
s(pipe) = Spacing Between Pipes
(inches)
Results - Detention Calculations Width Controls
Results - Detention Calculations Length Controls
Total Length of Pipe required for detention system
(feet)
Surface Bed Area for a detention system
(sf)
Actual length of pipe less excavation & width of header = L(pipe)
(feet)
Estimated number of Laterals
Please enter the number of laterals to use
Actual width of manifold
(feet)
Actual width of system
(feet)
Actual length of system
(feet)
Total Storage Volume Provided
(cf)
Does this system meet detention volume and width dimension requirements?
Results - Retention Calculations Width Controls
Results - Retention Calculations Length Controls
Total Length of Pipe required for retention system
(feet)
Surface Bed Area for a retention system
(sf)
Actual length of pipe less excavation & width of header = L(pipe)
(feet)
Storage Capacity for the retention system
(cf/lf)
Estimated number of Laterals
Please enter the number of laterals to use
Actual width of manifold
(feet)
Actual width of system
(feet)
Actual length of system
(feet)
Total Storage Volume Provided
(cf)
Does this system meet detention volume and width dimension requirements?