There are several french drain options available on the market today. None, however, compare to the compressive strength, guaranteed results, and as shown in the video below, in-flow rate.
Flow ratings are only a measure of how quickly water flows from the pipe. A more important question to ask is, “what is the in-flow rate?”
|System||Flow Rating/Linear foot Per (ASTM 4716)||“In-Flow” Rating (or Permeability Rate) in % of the openings across the surface||4-gallon Bucket Test (Time elapsed in seconds for water to empty)|
|4″ Perforated Pipe||32 gal||4-5%||27|
|Gravity (WaterGuard) System||8-9%||23|
|Hydraway Single Layer||10.5 gal||75%||11|
|Hydraway Double Layer||10.5||75%||6.5|