Soil Moisture, Groundwater Occurrence

Question 1

Layers in Vadose Zone (From upper to lower)

Answer 1

• Soil Water Belt
• Intermediate Belt
• Capillary Fringe

Question 2

is the depression or the rise of a liquid in a small capillary passage tube having small cross sectional area such as openings in the porous materials

Answer 2

Capillarity

Question 3

is the subsurface layer in which groundwater seeps up from a water table by capillary action to fill pores. Pores at the base of the capillary fringe are filled with water due too tension saturation

Answer 3

Capillary Fringe

Question 4

Capillarity results from 2 forces

Answer 4

• mutual attraction (Cohesion) between water molecules
• molecular attraction (Adhesion) between water and different soil materials

Question 5

• measuring instrument used to determine water potential (soil moisture tension) in the vadose zone
• Device typically consists of glass or plastic tube with porous ceramic cup and filled with water

Answer 5

Tensiometer

Question 6

Soil moisture at a location varies with changes in the

Answer 6

amount of precipitation and evapotranspiration

Question 7

H2O in the vadose zone available to growing plants, found in belt of soil water

Answer 7

Soil Water

Question 8

when soil-moisture content of a layer reaches to the points at which the force of gravity acting on the water = the surface tension, gravity drainage cease.

Answer 8

Field capacity

Question 9

the remaining moisture is too tightly bound the soil particles

Answer 9

Wilting point