7.23 Refer to Figure 7.25. During an auger hole test to determine field permea- bility, it was observed that the water table inside the hole rose by 5 cm in 8 min, when h = 2 m. Given: diameter of the auger hole = 150 mm, length of auger hole = 4 m, and depth of the ground water table from the surface = 1 m. Estimate k. Use Eq. (7.50). k = 0.617" dh Sd dt (7.50) where r = the radius of the auger hole d = the depth of the hole below the water table

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