2.9 A hydrometer test has the following results: G, = 2.7, temperature of water = 24°C, and L = 9.2 cm at 60 minutes after the start of sedimenta- tion. (See Figure 2.18.) What is the diameter D of the smallest-sized par- ticles that have settled beyond the zone of measurement at that time (that is, 1 = 60 min)? 3.1 For a given soil, show that Ysat Yu Yd - Ysat + Yw

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Laboratory Determination of Hydraulic Conductivity

Hydraulic conductivity is the measure of flowability of water inside the soil in the presence of a hydraulic gradient. The hydraulic gradient is defined as the difference in the water heads in the soil, which induces a water motion. In simple terms, a hydraulic gradient is the presence of a potential that induces a flow of water.