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A – well drained sands and gravel, high infiltration capacity, high leaching potential and low runoff potential;
B – Moderately drained fine to coarse grained soils, moderate infiltration capacity, moderate leaching potential and moderate runoff potential;
C – Fine grained, low infiltration capacity, low leaching potential and high runoff potential;
D – Clay soils, very low infiltration capacity, very low leaching potential and very high runoff potential.