TERMS
Two types of infiltrometer
flooding type, rainfall simulators
The zone where soil moisture will be at or near field capacity and the moisture content decreases with the depth.
wetting zone
HORTON'S EQUATION
fp=fc+(fo-fc)e-Kht
The volume of water that the ground can hold
FIELD CAPACITY
It is a shallow linear ditch that is filled with stone to create a narrow underground reservoir.
infiltration trench
PHILIP'S EQUATION
fp=1/2st-1/2+K
The rate at which soil is able to absorb rainfall or irrigation
INFILTRATION RATE
Water can change from a solid to a gas, without becoming a liquid first. Through this process of ________ our planet's ice can evaporate directly into the air without melting!
sublimation
KOSTIAKOV EQUATION
Fp=atb
The most commonly used flooding type infiltrometer. It consists of 2 concentric rings driven into soil
Double Ring Infiltrometer
The diameter and length of the metal cylinder for single ring infiltrometer
25cm-30cm, 50cm-60cm respectively
GREEN-AMPT EQUATION
fp=K(1+∆θSc/Fp)
The infiltrated water first meets the soil moisture deficiency, if any, and excess water moves vertically downwards to reach the groundwater table, what is this vertical movement called?
Percolation
Name the 4 moisture zones in the infiltration process and briefly explain each zone.
saturation-absorption limitation of soil
transition-water infiltrating from the surface moves downward and its characteristics begin to shift
transmission-characterized by a small change in water content with depth
wetting zone
COMULATIVE INFILTRATION CAPACITY
Fp= ∫t0fp(t)dt