SOIL PROBLEMSPOROSITY, PERMEABILITY, RETENTION

1a) Given information:Cross sectional area = (п)(r2)Volume of water = 50 mlPermeability = 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 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 drying25.8 g – 22.3 g = 3.5 g

Water holding capacity(3.5 g/25.8 g)(100) = 13.6 %

2) Percolation Rate Water Holding Capacity Soil

TypeSoil A 10.58 ml/cm2/min 13.6 % SandSoil B 4.3 ml/cm2/min 35.5 % ClaySoil C 7.5 ml/cm2/min 23.3 % Silt

3) 2.2 cm + 1.8 cm + 1.0 cm = 5.0 cm

2.2 cm/5.0 cm = (0.44)(100) = 44 % Sand1.8 cm/5.0 cm = (0.36)(100) = 36 % Silt1.0 cm/5.0 cm = (0.20)(100) = 20 % Clay

Loam Soil Type