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SOIL PROBLEMS POROSITY, PERMEABILITY, RETENTION. 1a) Given information: Cross sectional area = (п)(r 2 ) Volume of water = 50 ml Permeability = 10 sec.

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Presentation on theme: "SOIL PROBLEMS POROSITY, PERMEABILITY, RETENTION. 1a) Given information: Cross sectional area = (п)(r 2 ) Volume of water = 50 ml Permeability = 10 sec."— Presentation transcript:

1 SOIL PROBLEMS POROSITY, PERMEABILITY, RETENTION

2 1a) Given information: Cross sectional area = (п)(r 2 ) Volume of water = 50 ml Permeability = 10 sec = 0.167 min Percolation - the volume of water flowing through the soil at a given rate Cross sectional area = п (3cm) 2 = 28.3 cm 2 Percolation = 50 ml/ 28.3 cm 2 /0.167 min = 10.58 ml/cm 2 /min

3 1b) Water holding capacity is the percent of water retained by the soil Difference after drying 25.8 g – 22.3 g = 3.5 g Water holding capacity (3.5 g/25.8 g)(100) = 13.6 %

4 2) Percolation RateWater Holding CapacitySoil Type Soil A10.58 ml/cm 2 /min13.6 % Sand Soil B 4.3 ml/cm 2 /min35.5 % Clay Soil C 7.5 ml/cm 2 /min23.3 % Silt 3) 2.2 cm + 1.8 cm + 1.0 cm = 5.0 cm 2.2 cm/5.0 cm = (0.44)(100) = 44 % Sand 1.8 cm/5.0 cm = (0.36)(100) = 36 % Silt 1.0 cm/5.0 cm = (0.20)(100) = 20 % Clay Loam Soil Type

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