Overflow water screening apparatus

Abstract

The water screening apparatus of the invention includes a conduit in which is positioned a discharge pipe opening through which water flowing in the conduit is to be dispatched completely during normal water flow conditions. The discharge pipe opening is positioned adjacent the conduit bottom wall portion so that as long as the water level does not rise above it, the water is completely dispatched therethrough. A bar screen is transversely disposed inside the water conduit and downwardly slopes from the conduit upstream end to the discharge pipe opening and covers the whole conduit width. When the water level rises above the discharge pipe opening, the water flowing above the discharge pipe opening will flow through the bar screen, the latter intercepting any macroparticles beyond a set threshold level carried by the water flow. These intercepted solid particles will slide along the bar screen under the pressure exerted by the water flow, to be carried in this way into the refuse discharge pipe to be disposed of along with part of the water flow. This way, during water overflow conditions, even if the water is not completely disposed of by means of the discharge pipe opening, the overflow water will not carry large solids or suspended matter, since it will be screened before being conveyed elsewhere, for example to a river.