4. The permeability test as mentioned in the question above (a) was carried out twice on the same soil sample. The results of tests 1 and 2 are in Table 3. How long is the duration of test 2? Tabel 1 test 1 test 2 Unit Pipe Diameter cm Diameter of soil 15 15 cm sample length of soil sample 30 30 cm initial elevation 60 60 cm height at end of test 37 45 cm duration of test 10 ?? minutes

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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.