Runoff Curve Number for Artificial Turf?
Runoff Curve Number for Artificial Turf?
(OP)
Hey Guys,
I have an interesting problem in that a High School wants to replace the existing turf field with artificial turf and the question is ... Will the existing stormwater basin be able to handle the runoff without modifications? (I Know...Cost is no object when its tax payer money) The existing basin is located close to a stream within a high quality watershed (150 ft buffers) in PA and I'd rather not approach PaDEP with any earth disturbance within 150 feet of a stream even if I'm expanding an existing facility. (I'd rather bang my head against a brick wall)
Anyway, the cross section is the turf membrane, then 4-6" clean stone over some perforated pipe that eventually will discharge to the basin. It stands to reason that the runoff from the field will be exposed to the earth and there will be an infiltration component. In the Past I've modeled the turf fields as gravel (CN=85) but I think that's probably conservative.
Does anyone have any idea what the actual runoff coefficient is for Artificial Turf?
Thanks in advance
I have an interesting problem in that a High School wants to replace the existing turf field with artificial turf and the question is ... Will the existing stormwater basin be able to handle the runoff without modifications? (I Know...Cost is no object when its tax payer money) The existing basin is located close to a stream within a high quality watershed (150 ft buffers) in PA and I'd rather not approach PaDEP with any earth disturbance within 150 feet of a stream even if I'm expanding an existing facility. (I'd rather bang my head against a brick wall)
Anyway, the cross section is the turf membrane, then 4-6" clean stone over some perforated pipe that eventually will discharge to the basin. It stands to reason that the runoff from the field will be exposed to the earth and there will be an infiltration component. In the Past I've modeled the turf fields as gravel (CN=85) but I think that's probably conservative.
Does anyone have any idea what the actual runoff coefficient is for Artificial Turf?
Thanks in advance





RE: Runoff Curve Number for Artificial Turf?
- ADS used C=1.00 in this example calc: http://www.ads-pipe.com/pdf/en/a5.19a-advanedge_dr...
- This study has an in-depth discussion in the middle of the report: http://www.kirklandwa.gov/Assets/Planning/Planning...
- HydroCad has some advice regarding artificial turf: http://www.hydrocad.net/curvenumber.htm
In reviewing these and others, it looks to me like values between 0.75 and 1.00 are typically being assigned to artificial turf.==========
"Is it the only lesson of history that mankind is unteachable?"
--Winston S. Churchill
RE: Runoff Curve Number for Artificial Turf?
How you model the intercepted rainfall depends on the design of the stone bed: Is is sloped to drain rapidly, or does it retain or detain the rainfall? The later cases are often modeled as detention (pond) storage.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Runoff Curve Number for Artificial Turf?
If I were you, I would do a quick model, see if your existing basin will still work with the CN=98. If it does, then you are all set, you may be able to modify the outlet structure as well, which shouldn't push you back to the DEP if you arent modifying the basin shape.
RE: Runoff Curve Number for Artificial Turf?
If I were you, I would do a quick model, see if your existing basin will still work with the CN=98. If it does, then you are all set, you may be able to modify the outlet structure as well, which shouldn't push you back to the DEP if you arent modifying the basin shape.
RE: Runoff Curve Number for Artificial Turf?
Like I said... In the past I always modeled the Artifical Turf Areas as Gravel CN=85 and used the minimum 5 min time of Concentration. I did a turf field for a nearby college and one of the maintenance guys told me that he has never seen the discharge pipe running with more than a trickle. Who knows, maybe he just wasn't there to witness the peak. I Still think there will be some amounts of infiltration and I also think that there must be some attenuation in the system but without some hard data to back up my assumptions I'll stick with the numbers I usually use.
RE: Runoff Curve Number for Artificial Turf?
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Runoff Curve Number for Artificial Turf?