define of drainage system
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In geomorphology, drainage systems, also known as river systems, are the patterns formed by the streams, rivers, and lakes in a particular drainage basin. They are governed by the topography of land, whether a particular region is dominated by hard or soft rocks, and the gradient of the land.
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《Surface drainage systems remove excess water from the land's surface through channels or ditches.Different types of surfaces drainage systems are open drains, humps and hollows, levees, and grassed waterways. A cast-in-place trench drain is a perfect example of a surface drainage system.》
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