Lightweight and strong, its unique design increases the perimeter drainage area, allowing it to discharge water at a rate of up to 80 gallons per minute. DrainGreat attaches to standard, 3 inch diameter PVC pipe to extend through the face of shotcrete walls. The outlet can be reduced to 2 inch diameter with a PVC 3 inch to 2 inch reducer, but the resultant flow rate could be reduced. The outlet can be increased to 4 inches with a PVC 3 inch to 4 inch expander, but no greater flow rate will likely result.
Results of lab tests provided below.