Patent ID: 7674371

Claim:
A waste-water installation having an inflow side for contaminated water and an outflow side for cleaned water, the inflow and outflow sides separated by a wall member, said installation comprising: a cleaning device extending from and vertically above the wall member and between said inflow side and said outflow side to remove impurities from water flowing from said inflow side to said outflow side; a damming element disposed downstream of said cleaning device in a direction of flow of water cleaned by the cleaning device and flowing from the cleaning device to the outflow side; and wherein said damming element comprises a non-movable damming component and a movable damming component, at least a first portion of said non-movable damming component being disposed above said movable damming component and above the wall member, said movable damming component being configured to move automatically from a closed position to an open position by the pressure of water upstream of said damming element rising to a predetermined level above said movable damming component such that a flowthrough is established for water cleaned by said cleaning device to flow beneath said first portion of said non-movable damming component.