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TABLE 2 CALCULATIONS <br /> Hazen Method (Fetter 1994)Applicable to well sorted sands. Developed for slow sand filtration. <br /> Applicable to sands with 0.1 mm < D10 < 3.Omm and uniformity cofficient< 5 <br /> Beyer(Kresic 2006)Applicable to poorly sorted sands with 1 < Uniformity Coeff< 20 <br /> and 0.06mm < D10 < 0.6mm <br /> Bore D10 D50 D60 Uniformity Hazen Beyer <br /> Hole (mm) (mm) (mm) Coeff ft/day ft/day <br /> BH-1 0.15 1.3 2.1 14 64 51 <br /> BH-7 0.07 1.2 2.1 30 14 9 <br /> BH-9 0.10 2.1 3.5 35 28 17 <br /> Average 35 26 <br /> 30 <br />