The hydraulic conductivity of 54 sand-sized crushed limestone materials was measured by conducting constant head tests in a rigid-wall permeameter and was estimated using six predictive equations requiring easily obtainable parameters. The gradations tested had effective grain size, D₁₀, from 0.079 to 2.15 mm; uniformity coefficient, C_u, from 1.19 to 15.79; and void ratio, e, from 0.42 to 0.76. The measured hydraulic conductivity had a range of about three orders of magnitude (3.4*10⁻³ to 3.3 cm/s). Four of the predictive equations, based on the square of the effective grain size, D₁₀², yielded closely grouped results differing by not more than a factor of 2. Long existing equations by Terzaghi (1925) and by Hazen (1892), adjusted for void ratio according to Taylor (1948), were found to have a high predictive efficiency with a ratio of predicted to measured values between 1/2 and 2 for 70% of the materials tested. The Kenney et al. (1984) equation, based on D₅², was also efficient but underestimated measured values for 63% of all cases. The Kozeny–Carman equation (Taylor 1948; Chapuis 2012), based on specific surface, overestimated measurements for 90% of the tested materials by a factor of up to 3.

通过在刚性壁式渗透仪中进行恒定压头测试，测量了54种沙粒大小的碎石灰石材料的水力传导率，并使用六个需要容易获得参数的预测方程式对其进行了估算。所测试的等级的有效晶粒度D ₁₀为0.079至2.15 mm。均匀系数C _u为1.19至15.79；空隙率e从0.42到0.76。测得的水力传导率具有约三个数量级的范围（3.4×10 ^-3至3.3cm / s）。四个预测方程式，基于有效晶粒尺寸的平方D ₁₀ ²，产生的分组结果相差不超过2倍。Terzaghi（1925）和Hazen（1892）长期存在的方程式，根据泰勒（1948）的空隙率进行了调整，发现具有较高的预测效率对于70％的测试材料，预测值与测量值之比在1/2与2之间。肯尼等。（1984）基于D ₅ ^2的方程也很有效，但在所有案例中有63％的测量值被低估。基于特定表面的Kozeny-Carman方程（Taylor 1948； Chapuis 2012），高估了90％的被测材料的测量值，最高可达3倍。