Water Entry

Side inlet plate

The plate simply locates into two notches on the top or base grid of the Waterloc cell. The spacer bars at the base of the plate are designed to push into the gap either side of one of the honeycomb pillars. The plate should be installed against a pillar located at the centre of either side of the cell. Used for either water inlet and/or outlet, the incoming supply should be adequately filtered using a silt trap to prevent the build up of silt in the installation.

[NEED A LINK TO THE 'HOW TO INSTALL PLATE' MOVIE]

Perforated pipe

If used as an inlet pipe, the pipe should be laid along the centreline of the longer side of the construction and connected to the incoming 110mm supply with a slip coupling. It is recommended that the end of the pipe is capped using a cap and pressure plug, UE42 to ensure even water distribution.

If used as an outlet pipe for an attenuation scheme, the pipe is laid in the trench prior to installation of the cells. Care must be taken to adequately filter the incoming supply, preferably using a silt trap upstream of the installation. It is also recommended that access chambers are provided either side of the attenuation tank for cleaning purposes.

Inlet chamber

When using the inlet chamber and filter, a single Waterloc cell should be omitted from the centre of the top layer to form a well. (Note, the chamber can be positioned off centre but must be bounded on all sides by cells). The well is fitted with an adaptor tray, into which the inlet chamber is seated. The chamber has a 110mm spigot for connection to the incoming supply. The spigot is dual diameter and needs to be cut to the required size.

Once the pipe connections are made the geotextile can be pulled taut, folded beneath the supply pipe and be secured with adhesive tape to the top of the adaptor tray. All edges should be taped or heat welded to prevent ingress of soil.
 
At this stage the excavation can be partially backfilled with granular material and soil to within approximately 150mm of the top of the inlet chamber. A UCR2 riser (cut as required) is used to bridge the gap between the top of the inlet chamber and finished ground level. A chamber cover and frame completes the installation. The frame should be set into an appropriate depth of concrete bed to suit the load applications.

The supply pipe must be adequately supported along its length to ensure a minimum fall of 20mm per metre run is maintained.

With the construction finalised the excavation is backfilled with granular material and soil.