The Hayadegawa dam was built for three specific reasons: to prevent any more devastating floods in the area, to provide a water source for agricultural irrigation, and to provide hydro-electric power.
Download + build your own papercraft Hayadegawa dam (in beginner and bit more advanced versions, by Niigata Prefectural Government):
http://www.pref.niigata.lg.jp/niigata_seibi_niitsu/1356761760788.html
(download instructions: click the three links under "早出川ダムのペーパークラフト" just below the pictures on the Niigata Prefectural Government's website; in Microsoft *.xls Excel file format!)
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