Stormwater downpipe

Abstract

A stormwater overflow downpipe ( 10 ) has a pipe ( 14, 16 ) for directing stormwater from a roof gutter ( 18 ) to an underground stormwater drain pipe ( 20 ), and has stormwater egress means or apertures ( 22 ) formed in the pipe for allowing stormwater rising up within the pipe to exit the downpipe ( 10 ) therethrough. Particularly, the plurality of apertures ( 22 ) are formed through at least one wall ( 21 ) of the pipe.

1 . A stormwater overflow downpipe comprising pipe means for directing stormwater from a roof gutter to an underground drain pipe, and stormwater egress means formed in the pipe means for allowing stormwater rising up within the pipe means to exit the downpipe therethrough, wherein the stormwater egress means comprise a plurality of apertures formed through at least one wall of the pipe means.  
     
     
         2 . The stormwater overflow downpipe of  claim 1  wherein the pipe means includes a vertically disposed pipe portion and the plurality of apertures are formed through a front or side wall of the vertically disposed pipe portion.  
     
     
         3 . The stormwater overflow downpipe of  claim 1  wherein each one of the plurality of apertures is formed by punching and deforming a respective portion of a flat sheet prior to forming the flat sheet into the pipe means.  
     
     
         4 . The stormwater overflow downpipe of  claim 1  wherein the stormwater egress means comprise a plurality of apertures formed through a plate that is secured over an opening through at least one wall of the pipe means.  
     
     
         5 . The stormwater overflow downpipe of  claim 1  wherein each one of the apertures is defined by a deformed portion of the wall extending into the pipe means, wherein the deformed portion extends progressively further into the pipe means in a downward direction, the arrangement being such that stormwater flowing down the inside surface of the wall will not flow out of the pipe means through the apertures, but stormwater rising up within the pipe means will exit the pipe means through the apertures.  
     
     
         6 . The stormwater overflow downpipe of  claim 4  wherein the plate is removably secured over an opening through at least one wall of the pipe means.  
     
     
         7 . The stormwater overflow downpipe of  claim 6  wherein the opening is through the front wall of the pipe means and the plate is removably secured over the opening by screws.