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Environmental Implications of Japan's Geology 11, Typical small, steep gradient stream, flood risk, Oirase valley.

Typical small, steep gradient stream, flood risk, Oirase valley

Typical small, steep gradient stream, flood risk, Oirase valley. -- Small rivers, such as this, are particularly apt to flood during periods of heavy rain. The mountainous terrain and steep gradient, indicated by rapids and small waterfalls, assure that runoff will be rapid and the stream will rise quickly. Flooding is most likely in the early summer rainy period when stagnant weather fronts can produce 16 to 23 inches of rain in a 48 hour period, and during the fall typhoon season. Flooding can also occur as a result of rapid spring snow melt. Along with earthquakes and volcanic activity, flooding is a major natural hazard in Japan.
Editorial assistant: Joseph Augustin. Collection Librarian: Amy Bryant. -- Please send any questions, comments, or content corrections to Michael Thiedeman, Professor of Art, Earlham College, Richmond, IN 47374 USA. email address: thiedmi@earlham.edu -- With reference to this set of images dealing with the geology of Japan, you may wish to contact Dr. Charles Martin, Professor Emeritus, Department of Geology, Earlham College, email: martich@earlham.edu