Definition:
Engineering structures: built to protect land and property from damage by flood, e.g. levees, banks or other works along a stream; designed to confine floodwater to a particular channel or direct it along planned pathways; or a flood control reservoir.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO/IPTRID/ICID/ODA, 2000, Irrigation Guidelines, Land and Water Digital Media Series 12, & FAO, 2000, Handbook on Pressurized Irrigation Techniques