DamA dam is a structure that impounds water or restricts its flow.
Nils F. AmbursenNils F. Ambursen (February 6, 1876 – January 17, 1953) was a Norwegian-American civil engineer and inventor. He was the founder of Ambursen Hydraulic Construction Company and was known for his influential dam designs in the early 20th century. Early life and educationAmbursen was born at Fredrikstad in Østfold, Norway and was educated at the Telemark Civil Engineering College (Telemark ingeniørhøgskole) in Skien, Telemark.
ButtressA buttress is an architectural structure built against or projecting from a wall which serves to support or reinforce the wall. Buttresses are fairly common on more ancient (typically Gothic) buildings, as a means of providing support to act against the lateral (sideways) forces arising out of inadequately braced roof structures.*As an Amazon Associate I earn from qualifying purchases.