catchment area, Area that drains into the main river of a river system., delta, Area at the mouth of a river where the main river branches into many smaller channels., fall, The difference in elevation between two points along a river., flow rate, The amount of water flowing at a particular point in the river measured in m3 per second., graben, Part of the Earth’s surface located along a fault line that has sunk down relative to a horst., gradient, The fall per kilometre., horst, Part of the Earth’s surface located along a fault line that has been pushed upwards relative to a graben., impervious surface, Paved areas and infrastructure that prevent water from infiltrating into the ground., infiltration, Seepage of water into the ground., lag time, The time between when precipitation starts to fall somewhere in the catchment area and when the water level downstream in the river starts to rise., lower reaches, Last part of a river, near the sea., meander, Natural bend in a river., middle reaches, Part of the river located between the upper reaches and lower reaches., mixed river, River that is fed by both rainwater and meltwater from a glacier., oxbow lake, Lake that forms when a meander is cut off from the main river., regime, Fluctuations in the amount of water discharged by a river over the course of a year., river, A natural waterway that drains water from an area., river system, River with all of its tributaries and branches that are part of the same catchment area., sediment, Particles of sand and clay that settle to the bottom of a body of water. Also called deposition., watershed, Boundary between two catchment areas..

Chapter 2, section 3

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