SOIL PROBLEMS
the key soil properties of porosity, permeability, and retention through detailed analysis and calculations. Learn about water holding capacity, percolation rate, and soil types based on sand, clay, and silt composition. Gain insights into how these factors affect the quality of soil for various purposes.
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Presentation Transcript
SOIL PROBLEMS POROSITY, PERMEABILITY, RETENTION
1a) Given information: Cross sectional area = ( )(r2) 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 = (3cm)2 = 28.3 cm2 Percolation = 50 ml/ 28.3 cm2/0.167 min = 10.58 ml/cm2/min
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 %
2) Type Soil A 10.58 ml/cm2/min Soil B4.3 ml/cm2/min Soil C 7.5 ml/cm2/min Percolation Rate Water Holding Capacity Soil 13.6 % 35.5 % 23.3 % Sand Clay 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
