Diverting water using landscaping or natural elements to channel waterways or divert water away from sensitive areas like homes, roadways, or other structures.
Prevention with structural measures such as french drains, dams, retaining walls, barriers, jetties, and other measures to divert water from building up.
Emergency flood mitigation which includes using temporary sandbags as barriers, installing temporary dykes to prevent water from accessing homes or alleys that will lead to downstream flooding. Any tactic to remove flooding from a structure or roadway could be considered emergency flood mitigation, even temporary dams, french drain unclogging, or installing dykes.