Flood control
levees
the answer is levees or, Irrigation
levees (flood control)
Flood control! -Apex :]
levees (flood control)
irrigation
levees (flood control)
Food control Apex😑😐
Google's first -and historically major development- was its search engine's algorithm.
moonsoon
Two technological innovation which enabled the first skyscrapers to be built were the development of the elevator by inventor Elisha Otis and the design of steel structural supports for tall buildings by architect William Le Baron Jenney.
It was ratified by the states in 1913