| A | B |
|---|
| shrink-swell potential increase | clay content increases |
| kaolinite clay | usually have low shrink-swell potential |
| montmorillonite clay | high shrink-swell potential |
| soil compaction | particles pressed together; reduced pore space |
| dry soil | resistant to compaction |
| fragipan | root restrictive layer other than bedrock |
| gravitational water | free flowing water through or off the soil |
| capillary water | water flow around individual soil particles; plant roots remove this water |
| capillary rise of water | when water from a water table moves upward through the soil against the force of gravity |
| permeability | refers to the movement of air and water within the soil |
| permeability rate | rate at which the saturated soil transmits water (in/hr) |
| infiltration | the downward entry of water into the immediate surface of the soil |
| infiltration rate | rate at which water penetrates the surface of the soil at any given instant (in/hr) |
| drainage | the removal of excess water from the soil |
| appparent water table | water table with all horizons between the upper boundary of saturation and a depth of six feet |
| water table | (the ground water level) a zone in the soil that is saturated with water for significant periods during the year |
| perched water table | water table in which saturated layers are underlain by one of more unsaturated layers within six feet of the surface |
| flooding | the temporary covering of the soil surface by flowing water |
| ponding | the standing water of marshes, swamps, or closed depressions |
