A new automatic field permeameter was designed to measure the in situ permeability of porous asphalt roads under field testing conditions. This apparatus works on the falling head principle; the falling head with time is measured through a porous road slab with a precise pressure transducer at the base of the apparatus at very close intervals of 100 (Hz) data points/s. With the falling head data, the specific discharge (υ) can be computed and plotted against the hydraulic gradient (ip1); the 3D flow permeability of the material is obtained at
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