Infiltration
is measured using flooding-type infiltrometer. There are two types of
infiltrometer, one of them is consisting of only one ring, while the other one
consists of two concentric rings. The infiltrometer is first inserted into the
ground. Then, water is poured into the space produced by the part of
infiltrometer protruded from ground surface. Throughout the measurement, water
is added from time to time to maintain the water level. Volume of water added
as well as the time intervals are recorded simultaneously.
On the
other hand, models are developed to describe the infiltration capacity of soil.
Among these models, there are Horton’s, Philip’s, Kostiakov and Green-Ampt
equations.
To implement these equations, we first need data obtained from the infiltrometer. Then, we need to evaluate the model parameters after post-processing of data and production of graph. The best fit line and its line equation are then determined for each of these plots. For each equation, the gradient and vertical axis intercept of best fit line have different meaning, and they help us to define the model parameters.
The following shows some information on the measurement and estimation of infiltration. Watch the video above for full details.
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