Suitable for roof gardens or patio areas above a room, Delta-Terraxx is a protection and drainage system from Delta Membrane Systems.

With a dimpled sheet and a fused-on geotextile it will form an effective drainage layer. Under a covering of gravel, chippings or soil, the geotextile keeps the dimple structure from being clogged up by sludge, ensuring any excess water is drained away effectively.
Featuring a self-sealing edge the dimpled sheet should be easy to install, while its smooth backing makes sure that any loads are evenly distributed across the waterproof surface.

Marley Plumbing and Drainage offer what it describes as a robust flow control device for stormwater management.
Used as part of an attenuation scheme, Flowloc controls the rate at which water is discharged to a surface water drain or watercourse. This helps meet the outflow rates set by the Environment Agency, Local Authority or water companies.
Available in six pre-set flow rates - from 2l/s to 15l/s - the flow control allows a near constant discharge rate to be set. The device is installed within a durable chamber base and features a quick release mechanism that allows easy access for maintenance.
The chamber base can be used independently upstream as a 600mm silt trap to protect attenuation or infiltration tanks from debris and salt.