1. Watercourses
1.1 Definition and structure
Whatever its size, a watercourse (or a body of water, in the case of lacustrine or stagnant environments) is formed within a drainage basin (BV), which constitutes its recharge surface. A BV is a water collection area located upstream of a geographical point and defined as an outlet. This area is bounded by the contour within which all water flows, above and below ground, towards this outlet. Its boundaries are known as watersheds.
This definition applies to all sizes of watercourse, from the smallest stream to the world's largest rivers. Given this mode of formation, there are links between the surface area of the BV, its climato-geographical situation and the flow of the watercourse (hydrographic...
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Watercourses
River degradation: causes and effects
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