long exposure top view photo of water release at spillway or overflows at big dam khun dan prakan chon dam in nakhon nayok

architecture barrage big chon concrete construction control dam dan drain drainage electrical electricity embankment energy engineering environment exposure flood floodgate flow gate generator hydro hydroelectric industrial jetty khun landmark landscape largest long longest mountain nakhon nature nayok outdoor overflows photo power prakan province release renewable reservoir resource river spillway spray station technology thailand top tourism tourist travel view wall water weir