One of the most widely accepted theories is that the name comes from the Irish word , defined by Dinneen as a pigmy, a sprite, a leprechaun; for ; the latter word Dinneen defines as a pigmy, a leprechaun; 'a kind of aqueous sprite';ref dinneen this word has also been identified as meaning half-bodied, or small-bodied.
Exfiltration is the gradual leakage of fluid through any industrial equipment, a membrane or a wall because of small opening. Exfiltration occurs when a small opening allows fluid to drain from within an assembly. The gradual deposition of leaking fluid can cause corrosion in metal structures such as boilers, heat exchangers, storage tanks and other types of equipment and machinery. Exfiltration is also known as weep.
Infiltration is the process by which water on the ground surface enters the soil. Infiltration rate in soil science is a measure of the rate at which soil is able to absorb rainfall or irrigation.It is measured in inches per hour or millimeters per hour. The rate decreases as the soil becomes saturated.f the arrival of the water at the soil surface is less than the infiltration capacity, it is sometimes analyzed using hydrology transport models, mathematical models that consider infiltration, runoff and channel flow to predict river flow rates and stream water quality.