Express flood mitigation works using elevated and or at ground level with tunnel integrated large scale aqueduct with numerous functions, with main function to divert flood water or river water away from cities in order to fight or mitigate flood events and effect of global warming, with discharge invert levels to the sea higher than high tide levels

The present invention provides a system for flood water or water flow mitigation, comprising: at least one aqueduct or drain (100) having a first section linking a river, lake, reservoir, water retention pond (200) or dam (1) to another section linked to another lake, reservoir, storage tank (600) or sea (500), characterized in that the first section are positioned at higher than the other section, and the aqueducts or drains (100) are configured to be placed above ground level or extend upward from sides of river or existing drain (400), such that invert levels of the aqueducts or drains (100) are higher than sea levels during high tide flooding or sea level increases.