The variables that must be considered for formulating the rate at which infiltration occurs in an area are hydraulic conductivity, percolation, net-rainfall, soil type and flow.
Infiltration is the flow of water below the soil surface under gravity action and pressure effects.
The following are the variables-
1. Hydraulic conductivity- It is the limiting value of infiltration when the soil is saturated and homogeneous.
2. Percolation- The vertical water flow under the influence of gravity.
3. Net-rainfall- Amount of rain that falls on the ground. It is also called Production factor.
The others factors include soil type, soil coverage, topography, flow supply, soil compaction and soil humidity.
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