Isawa II power station surge tank and penstock.
photo: <a href="//commons.wikimedia.org/wiki/User:Qurren" title="User:Qurren">Qurren</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Qurren" title="User talk:Qurren"><span class="signature-talk">talk</span></a>)
<span class="int-own-work" lang="en">Own work</span>