A water-oil separation device uses a difference in density between water and oil. The water-oil separation device can easily and quickly separate oil by using a polymer film floating at interface between water and oil. The water-oil separation device easily and quickly collects oil of various viscosities with a simple structure by using differences in density between materials without using a conventional lyophilic/lyophobic film, thus solving the drawbacks of conventional filter-based and adsorption-based methods, and enabling quick and effective responses to actual oil spill situations.

A system for flood water or water flow mitigation includes at least one aqueduct or drain having a first section linking a river, lake, reservoir, water retention pond or dam to another section linked to another lake, reservoir, storage tank or sea, characterized in that the first section are positioned at higher than the other section, and the aqueducts or drains are configured to be placed above ground level or extend upward from sides of river or existing drain, such that invert levels of the aqueducts or drains are higher than sea levels during high tide flooding or sea level increases.

A system for flood water or water flow mitigation includes at least one aqueduct or drain having a first section linking a river, lake, reservoir, water retention pond or dam to another section linked to another lake, reservoir, storage tank or sea, characterized in that the first section are positioned at higher than the other section, and the aqueducts or drains are configured to be placed above ground level or extend upward from sides of river or existing drain, such that invert levels of the aqueducts or drains are higher than sea levels during high tide flooding or sea level increases.

A system for flood water or water flow mitigation includes at least one aqueduct or drain having a first section linking a river, lake, reservoir, water retention pond or dam to another section linked to another lake, reservoir, storage tank or sea, characterized in that the first section are positioned at higher than the other section, and the aqueducts or drains are configured to be placed above ground level or extend upward from sides of river or existing drain, such that invert levels of the aqueducts or drains are higher than sea levels during high tide flooding or sea level increases.

A system for flood water or water flow mitigation includes at least one aqueduct or drain having a first section linking a river, lake, reservoir, water retention pond or dam to another section linked to another lake, reservoir, storage tank or sea, characterized in that the first section are positioned at higher than the other section, and the aqueducts or drains are configured to be placed above ground level or extend upward from sides of river or existing drain, such that invert levels of the aqueducts or drains are higher than sea levels during high tide flooding or sea level increases.