A constant-head permeability test is performed, and the information below indicates the test conditions and results. From the given data, provide a sketch representing the test arrangement, and calculate the value for the coefficient of permeability. On the basis of the computed value for khyd, indicate the probable soil type.

• Water flows horizontally through the soil sample.
• The height of the reservoir supply source is 2 m above the elevation of the outlet reservoir.
• The soil sample length in the direction of water flow is 200 mm.

. The cross-sectional area of the soil sample is 1,950 mm2.

• The measured volume of flow for the steadystate condition is 500 ml in a 10-minute time period (note 1 ml = 1,000 mm3).

# A constant head permeability t

A constant head permeability test has a soil sample length in the direction of flow of 350 mm, a sample cross sectional area normal to the flow direction of 125 cm2, and a head loss through the sample of 420 mm.  The soil sample is a medium dense sand with a void ratio of 0.61.  During a 3 minute test period, 580 cm3 of water flowed through the sample.  (a) Sketch the Constant Head Permeameter and label the sketch with the appropriate dimensions given above.  (b) Determine the Hydraulic conductivity, k, in cm/sec, and the seepage velocity (not just apparent velocity).

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