HydroCAD® Stormwater Modeling - Since 1986
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HydroCAD® Stormwater Modeling - Since 1986
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Modeling artificial turfModeling runoff from artificial turf requires the determination of an effective CN value, which is sometimes available from the turf supplier. However, the CN value you achieve will depend largely on the base material, so it is important to follow manufacturers recommendations carefully. In some cases, you may be able to estimate a CN value based on the potential maximum retention. However, most installations of artificial turn are intended to intercept most of the rainfall, passing it through to a sub-surface storage system, and preventing any surface runoff. If your goal is to model sub-turf storage, and the turf is expected to capture (infiltrate) all the rainfall, the "runoff" (infiltrating through the turf) could be modeled as a subcatchment with a CN value of 98. The sub-turf storage could then be modeled as a pond, using the appropriate voids for the sand or stone fill. (Storage could be maximized by using embedded chambers, allowing the "pond" to handle additional inflows). The final discharge could be through exfiltration into the surrounding soil, and/or specific outlet devices, such as perforated pipe (modeled as an orifice array.)
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