Small Peak Runoff
Small Peak Runoff
(OP)
Is there ever a time when the difference between the pre and post developed runoff is so small that you wouldn't provide detention?
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RE: Small Peak Runoff
RE: Small Peak Runoff
RE: Small Peak Runoff
RE: Small Peak Runoff
RE: Small Peak Runoff
Examples where you may not have to detain include: if you were tying into a downstream storm drain system and you could prove that it had the capacity to handle your increased runoff, you may not have to detain. Or if you were outfalling into a channel and could prove that you weren't adversely impacting downstream property owners (or get consent from d/s owners), it may be allowed (doubtful, though).
RE: Small Peak Runoff
I believe the EPA regs allow for no detention if the difference in pre and post 100 year storms is not greater thean .1 cfs.
Mike McCann
MMC Engineering
RE: Small Peak Runoff
Thanks
RE: Small Peak Runoff
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Small Peak Runoff
RE: Small Peak Runoff
RE: Small Peak Runoff
Even if some storage is required by your local authority it could not be very much and should be easily and cheaply provided for somewhere within the 13 acres you have available.
RE: Small Peak Runoff
Peter Smart
HydroCAD Software
www.hydrocad.net