overflow tower or Überlaufturm or ueberlaufturm on the klöntalersee alpine reservoir lake or kloentalersee or klontaler lake

alpine architecture attraction beautiful bridge building canton channel concrete control dam depth downstream drain earthen electricity engineering environment flood flow flowing glarus history hydraulic hydro industry intake kloentalersee klontaler klöntalersee lake landmark landscape levee mountain natural nature old outdoor outdoors outlet overflow power regulate release reservoir river riverbed scenery schweiz spillway structure supply switzerland tourism tower travel tree ueberlaufturm wall water Überlaufturm