It is a watered-down percolation compared with the eye-twitchingly strong varieties sold in little thimbles in many European cafés, but it is coffee nonetheless.
The deposit must be permeable to permit percolation of the mineral solutions.
Conditions that favour the deposition are: (1) a source rock above the cavern; (2) downward percolation of water supplied from rain; (3) tight but continuous passageways for this water, which determine a very slow drip; and (4) adequate air space in the void to allow either evaporation or the escape of carbon dioxide from the water, which thus loses some of its solvent ability.
Actual evapotranspiration is never greater than precipitation except on irrigated land because of percolation of water into groundwater bodies and surface runoff.
The soil moisture zone gains water by precipitation and infiltration and loses water by evapotranspiration, overland flow, and percolation of water downward due to gravity into the groundwater zone.
The water cycle consists of various complicated processes of precipitation, evaporation, interception, transpiration, infiltration, percolation, retention, detention, overland flow, throughflow, and runoff.
The development of E horizons is favoured by high rainfall and sandy parent material, two factors that help to ensure extensive water percolation.
Melt and percolation through the weak firn layer bring most of the freeboard volume to the melting point.
The water balance equation for change of soil moisture storage in a soil is given as where S is storage, P is precipitation, E is evaporation, and R is surface runoff plus percolation rate into the groundwater zone; all terms are in units of length per unit of time (e.g., millimetres per day, centimetres per month).
Areas near seacoasts or low-lying areas near streams stay moist enough for peat to form, but elevated swamps (some bogs and moors) can produce peat only if the annual precipitation exceeds annual evaporation and little percolation or drainage occurs.
Listing six characteristics that indicated that the spherical concretions found in Utah were a good analog for the Mars blueberries, Chan's team concluded that the formation of the blueberries required the percolation of two separate aqueous solutions.
