Prior to the construction of a landfill, a field hydraulic conductivity test was

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Prior to the construction of a landfill, a field hydraulic conductivity test was conducted using a lysimeter (underdrain) to determine the suitability of the local clay soils for use as liners for the landfill. Water was ponded to a depth of 30 cm above the 90-cm-thick compacted clay. The cross-sectional area of the lysimeter was 10,000 cm2 (see figure). In 105 days, 1814.4 cm3 of water was collected in the lysimeter. a) Determine the hydraulic conductivity of the clay. Is this clay suitable for liner construction? b) Regulations at this site require that leakage (flow) through liners should not exceed 6500 cm3/year-m2. Using the information from the test, determine if the local soil meets the regulatory criteria. c) An additional lysimeter test was conducted using a dye tracer. If the dye tracer is injected into the water above the clay, how long (in years) will it take for the dye to show up at the bottom of the liner (start dripping from the bottom of the liner)? Assume that the dye fully and completely displaces the residual soil water. Also assume that initially the liner is saturated (S = 100%). The soil has a void ratio of 0.65. Hint: consider difference between Darcy velocity and seepage velocity 30 cm Water 90 cm Cla Lysimeter Water dripping into lysimeter

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