Jisho

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すいけい 水系
Common word Links
Noun
1. water system; river system; drainage system​
Wikipedia definition
2. Drainage system (geomorphology)​In geomorphology, a drainage system is the pattern formed by the streams, rivers, and lakes in a particular drainage basin. They are governed by the topography of the land, whether a particular region is dominated by hard or soft rocks, and the gradient of the land. Geomorphologists and hydrologists often view streams as being part of drainage basins. A drainage basin is the topographic region from which a stream receives runoff, throughflow, and groundwater flow.
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