Abstract: A treatment device for stormwater is provided that comprises a container which in use contains a growing medium and a hydrodynamic separator located within the container. The hydrodynamic separator comprises a separation chamber, an inlet duct extending from the outside of the container to the separation chamber, a solids outlet; and a liquid outlet that opens into the container. In use, liquid flow containing solids enters the separation chamber through the inlet duct and is caused to swirl within the separation chamber, thereby causing solids to exit the separation chamber through the solids outlet and liquid to exit the separation chamber through the liquid outlet and to flow into the growing medium.

Abstract: A water treatment apparatus comprises a chamber divided by a partition into a treatment section and an outlet section. The treatment section may, for example, contain a filter media including organic material which supports a shrub or tree. Runoff water enters the treatment section over an inlet chamber which forms a bridge over the outlet section. During heavy flow conditions, some of the incoming water overflows inlet bypass weirs to pass directly to the outflow section, bypassing the filter media in the treatment section.

Abstract: A treatment device for stormwater is provided that comprises a container which in use contains a growing medium and a hydrodynamic separator located within the container. The hydrodynamic separator comprises a separation chamber, an inlet duct extending from the outside of the container to the separation chamber, a solids outlet; and a liquid outlet that opens into the container. In use, liquid flow containing solids enters the separation chamber through the inlet duct and is caused to swirl within the separation chamber, thereby causing solids to exit the separation chamber through the solids outlet and liquid to exit the separation chamber through the liquid outlet and to flow into the growing medium.

Abstract: A treatment device for stormwater is provided that comprises a container which in use contains a growing medium and a hydrodynamic separator located within the container. The hydrodynamic separator comprises a separation chamber, an inlet duct extending from the outside of the container to the separation chamber, a solids outlet; and a liquid outlet that opens into the container. In use, liquid flow containing solids enters the separation chamber through the inlet duct and is caused to swirl within the separation chamber, thereby causing solids to exit the separation chamber through the solids outlet and liquid to exit the separation chamber through the liquid outlet and to flow into the growing medium.

Abstract: A water treatment apparatus comprises a chamber divided by a partition into a treatment section and an outlet section. The treatment section may, for example, contain a filter media including organic material which supports a shrub or tree. Runoff water enters the treatment section over an inlet chamber which forms a bridge over the outlet section. During heavy flow conditions, some of the incoming water overflows inlet bypass weirs to pass directly to the outflow section, bypassing the filter media in the treatment section.

Abstract: A treatment device for stormwater is provided that comprises a container which in use contains a growing medium and a hydrodynamic separator located within the container. The hydrodynamic separator comprises a separation chamber, an inlet duct extending from the outside of the container to the separation chamber, a solids outlet; and a liquid outlet that opens into the container. In use, liquid flow containing solids enters the separation chamber through the inlet duct and is caused to swirl within the separation chamber, thereby causing solids to exit the separation chamber through the solids outlet and liquid to exit the separation chamber through the liquid outlet and to flow into the growing medium.

Abstract: A vortex flow control device is manufactured by forming a template unit having end walls of which the wall has an outlet opening, and a partial outer wall. The partial outer wall has an opening. A plate is subsequently secured to the template unit to partially close the opening, to leave an inlet. The size of the plate is selected so as to result in an inlet 30 sized to achieve required flow characteristics for the finished device. The plate is inclined to a planar portion on the opposite side of the inlet at an angle in the range 85° to 95°, so as to induce turbulence in the region of the inlet.