Wastewater treatment center: Building at left performs preliminary treatment of waste water and release it to the series of ponds for biological treatment. Ponds serve to purify the "gray water" through the action of bacteria and other natural systems. In this way, the wetland development finishes the cleaning process by acting as an effluent "polishing" system. Biological systems are the natural processes of the landscape which are effective in their use of soil filtering and utilizing the activities of plants and micro-organisms in a less energy intensive way than mechanical treatment. after this process the water is ready for use in the urban landscape.

Above: Stepped water outlets in treatment ponds re-aerate water between treatment stages. Right: Biological water treatment diagram shows sedimentation of suspended solids, nutrients bacteria and trace elements and absorption by plants in open water and decomposition in shady areas. This occurs in conjunction with atmospheric gas uptake to polish the partially mechanically treated greywater in areas reserved for wildlife and passive recreational uses.

Left:This image shows the potential ambiance of a reservoir at the end of a series of wastewater treatment ponds.