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HYDROLOGY – “THE STUDY OF WATER”

A stream is a flow of running water, large or small, whereas a river is a large stream of water.
Both are integral parts of the hydrological cycle – their main function is to transport water from the land to the sea.
Hydrological cycle – it is another term for the water cycle.
Precipitation – It’s the type, total amount and intensity of precipitation are key factors in determining the nature of water movement
Interception – Vegetation intercepts some precipitation on its way to the ground, water is lost back into the atmosphere by evapotranspiration. Intercepting plants use water for growth and vegetation reduces and slows down water transfer.
Infiltration - It involves water moving from the ground surface into the soil, the rate of this depends on moisture content of the soil and its porosity.
Evaporation – It’s when water is loss from the ground surface into the atmosphere
Overland flow – It’s a rapid form of water transfer over the surface of the ground, it’s likely to happen during periods of heavy rainfall or when the soil has become completely saturated.
Evapo-transpiration – It’s when water is loss from the ground surface to the atmosphere, combines with water given off from plants to form the main output from the system.
Through-flow – The downhill transfer of water through the soil layer to the river, this shallow transfer can be quite rapid in very porous sandy soils.
Percolation – The deeper transfer of water into permeable rocks those with joints also known as pervious or those that are porous.
Base-flow – Very slow transfer of water through rocks which only happen in limestone areas where there are extensive underground channels so the flow can be faster
Stem-flow – It’s the flow of intercepted water down the stem of a plant
Soil storage – Water can be stored in air spaces between soil particles after

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