The dams in the famous Zuiderzee Works [1] are about 13m high, it seems.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Zuiderzee_Works" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Zuiderzee_Works</a>