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Sunday, 13 December 2009

report text jodhia rachmaputri 11ia5 / 18

RIVER

River is fresh water circulation from natural source on continent which heading for lake, sea, ocean, or bigger river. Water flows from upstream and heading for downstream.

Flow of water on upstream has very fast current, but flow of water on downstream has calm current. Water flows and makes erosion and sedimentation on river. Erosion results are big and small stones which carry heading for downstream. Soft materials like sand and mud will sink to the bottom and pile up as of sediment on river mouth.

River has many types. The types are eternal river and seasonal river. Eternal river always filled with water. Seasonal river will filled with water on rain season, and river isn’t filled with water on dry season. Example of eternal river are Serayu River on Jawa Tengah and Mahakam River on Kalimantan.

River has many benefits. River can be water source for farming. People can find fish to eat or to sell on river. River is can be energy source for electricity power plant. River can be recreation place too.

River not only has benefits but also has loss. River can be a media for diseases spreading. River can arouse flood. River can make water pollution too.


jodhia rachmaputri / 11ia5 / 18

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