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The Urrbrae Wetland is a constructed urban wetland located in Urrbrae, South Australia, in the suburbs of Adelaide. It was constructed to manage flood water from the nearby Adelaide Hills and has been developed to provide ecological and educational benefits. The wetland covers approximately 6 hectares of land previously part of Urrbrae Agricultural High School. The area of water is approximately 4 hectares and when full, contains approximately 13.5 million litres of water. == Description == The wetland consists of four ponds: the main pond, two sedimentation ponds and the farm dam. The main pond is clay lined and is designed to be kept filled to prevent drying out and cracking. The farm dam is synthetic lined and is used to top up the main dam when water levels are low. In an average year about 400 million litres of storm water passes through the wetland each year. When the wetland is full it contains about 13.5 million litres of water from a catchment of approximately 380 hectares. Although it is not a true wetland, it serves a useful function in the cleansing of the stormwater via natural cleaning process including: * The water flow is slowed down * Sand and other sediments fall to the bottom * Heavy metals, salts, bacteria et ‘stick’ onto the falling sand particles * Reeds, sedges and other plants along the shores filter out much of the salts and heavy metals. Leaf litter, plastic bags and other debris is removed by trash removal systems at the entry to the sedimentation ponds to aid in cleansing of the water. The cleansed water then travels via storm water pipes to Brownhill Creek and to the sea. This process is arranged and funded by the City of Mitcham. In 2011 construction began on pipes and facilities for some of the water to be pumped to tanks at the High School and used for watering grounds during summer months. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Urrbrae Wetland」の詳細全文を読む スポンサード リンク
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