Drainage system

Abstract

A drainage system 10 comprises a hollow catchment chamber 14 having an elongate mouth 16 through which liquid enters the chamber 14 , and a body 18 having first and second angled surfaces 20 a and 20 b that direct the flow of liquid collected in the chamber 14 to an outlet 22 . Preferably the body is a triangular shaped body 18 . The angled surfaces 20 direct the flow of water and other liquids in a linear course directly to the outlet 22 , from where it is forced down a dropper pipe 24 . This provides the catchment chamber 14 with an aggressive, self-cleaning capacity. The dropper pipe 24 is connected to the outlet 22 of the catchment chamber 14 for dropping the liquid collected in the chamber 14 directly into a carrier pipe 12.

1 . A drainage system for draining stormwater or like liquids from a surface, the drainage system comprising:
 a catchment chamber for collecting liquid comprising an elongate mouth through which the liquid enters the chamber and a hollow body having first and second angled surfaces that direct the flow of liquid in the chamber to an outlet;   a carrier pipe for carrying the collected liquid away; and,   a dropper pipe connected to the outlet of the catchment chamber for directing the liquid collected in the catchment chamber to the carrier pipe.   
     
     
         2 . A drainage system as defined in  claim 1 , wherein the mouth of the catchment chamber is in the form of a slot. 
     
     
         3 . A drainage system as defined in  claim 2 , wherein the hollow body is a triangular shaped body and has first and second sidewalls which are oriented in a substantially vertical direction in situ and are joined together by the first and second angled surfaces to form the hollow body. 
     
     
         4 . A drainage system as defined in  claim 3 , wherein the sidewalls have a necked portion adjacent the mouth of the chamber whereby the width of the slot is less than the width of the body of the chamber. 
     
     
         5 . A drainage system as defined in  claim 1 , wherein the catchment chamber is one of a plurality of catchment chambers, located in situ with the mouths of the chambers provided adjacent to each other end to end so as to form a substantially continuous drainage inlet. 
     
     
         6 . A drainage system as defined in  claim 1 , wherein the system further comprises a rail which is mounted above the mouth of the catchment chamber so as to form an inlet for the catchment chamber. 
     
     
         7 . A drainage system as defined in  claim 6 , wherein the rail comprises a pair of elongate members which are adapted to align with the longitudinal edges of the mouth of the catchment chamber. 
     
     
         8 . A drainage system as defined in  claim 7 , wherein each elongate member has a plurality of wings extending from an outer surface of the member. 
     
     
         9 . A catchment chamber for a drainage system for draining stormwater or like liquids from a surface, the catchment chamber comprising:
 an elongate mouth through which liquid enters the chamber and a hollow body having first and second angled surfaces that direct the flow of liquid in the chamber to an outlet.   
     
     
         10 . A catchment chamber as defined in  claim 9 , wherein the catchment chamber is manufactured from a plastics material. 
     
     
         11 . A catchment chamber as defined in  claim 9 , wherein the mouth of the catchment chamber is in the form of a slot. 
     
     
         12 . A catchment chamber as defined in  claim 11 , wherein the hollow body is a triangular shaped body and has first and second sidewalls which are oriented in a substantially vertical direction in situ, the sidewalls having a necked portion adjacent the mouth of the chamber whereby the width of the slot is less than the width of the body of the chamber. 
     
     
         13 . A catchment chamber as defined in  claim 9 , wherein a dropper pipe is connected to the outlet of the catchment chamber for directing the liquid collected in the catchment chamber to a carrier pipe. 
     
     
         14 . A method of installing a drainage system for draining stormwater or like liquids from a surface, the method comprising the steps of:
 digging a trench for the drainage system;   laying a carrier pipe in the bottom of the trench for carrying collected liquid away;   connecting a dropper pipe to the carrier pipe;   connecting a catchment chamber to the dropper pipe, the catchment chamber comprising a hollow body having first and second angled surfaces that direct the flow of liquid in the chamber to an outlet, the outlet of the catchment chamber being adapted to connect to the dropper pipe for directing the liquid collected in the catchment chamber; and,   connecting a rail to the catchment chamber so as to form an inlet for the catchment chamber;   pouring concrete around the catchment chamber and underneath the hollow body so as to form a monolithic concrete slab which provides strength and support.