Curve number for gravel parking area
Curve number for gravel parking area
(OP)
I need to find the curve number for a couple of gravel parking lots. All I can find in the curve number tables of Hydrocad and TR-55 is gravel with right of way included. The numbers for that have to be lower than for just plain gravel pavement.
I am guessing close to 98 but I don't want to overdo it either.
Thanks
I am guessing close to 98 but I don't want to overdo it either.
Thanks





RE: Curve number for gravel parking area
However, if you examine the TR-55 values for gravel road with ROW, they appear to be based on 30% gravel with CN=96 and 70% "open space" in poor condition. So 96 would be a reasonable value to use for the gravel alone.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Curve number for gravel parking area
If it's for a volume of runoff though, you may want to choose something little lower and this will probably give you an head ache.
It's not an exact science...
RE: Curve number for gravel parking area
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Curve number for gravel parking area
RE: Curve number for gravel parking area
Same issue if the lot is constructed on compacted fill as oppose to natural ground.