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10 Cards in this Set

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  • Back
what is 'plant available water'?
the amount of water that can be extracted by the plant.


the difference in soil moisture content between the field capacity and the wilting point.
what is a swelling clay? why are such soils a problem in watershed management?
montmorillonite clay is a 3 layer system (Si, Al, Si) that is loosely held together. Water arrives, soil layers swell and seal, infiltration stops...which leads to runoff, sedimentation, gully formation.
what is the cause of surface runoff?
-Rainfall exceeds rate of which water can infiltrate soil.

-Soil is saturated.
what is interception and why is it important?
interception is the water caught in vegetation that evaporates before it reaches the surface of the ground.
what factors control the evaporation rate from bare soil?
wind, temp, humidity, light, soil water
evaporation pan
measures evaporation of water in to the atmosphere
how is transpiration rate controlled?
dry soils-->plants take up less water-->less soil transpiration
Darcy's law

the greater the difference in pressure, the faster the flow

predicts amount of water flowing through an aquifer
artestian spring/well
water flows from ground

water from confined (pressurized) aquifer
in unconfined aquifers, how can we determine the depth to the water table?
drill a well into the aquifer. when reach water, that is the aquifer (vs confined aquifers...the water rises bc it is under pressure, perhaps artesian spring)