ASTM: Testing Surface Infiltration Rate of Permeable Unit Paving Systems
The ASTM International recently released C1781 Standard Test Method for Surface Infiltration Rate of Permeable Unit Pavement Systems. This test method is specifically designed for assessing the surface infiltration rate of new and in-service permeable interlocking concrete pavements and permeable clay brick pavements. The test method involves timing a slow pour of a known weight of water into a 12 inch diameter pipe fastened to the permeable pavement surface with plumber’s putty. The infiltration rate is easily calculated using a formula in the test method. The test method also provides guidance on how to locate the 12 in. diameter pipe on the unit paving surface to measure infiltration that represents the pattern on the larger pavement area. The test uses similar equipment and methods in ASTM C1701 Standard Test Method for Infiltration Rate of in Place Pervious Concrete. The similarities between C1701 and C1781 make the test results comparable.