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Essay on Melbourne's Water Supply

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Essay on Melbourne's water supply Water Collection In Melbourne around 80% of our drinking water comes from closed water catchments in the Yarra Ranges and the rest comes from open water catchments. 157,000 hectares of forest has been closed to the public for over 100 years. These native forests filter rainwater as it flows across land into creeks, rivers and our reservoir storages. Open water catchments have mixed land uses (like farming) instead of being used exclusively to harvest water. Open water catchments are called "open" catchments because it is also opened to the public for recreational activities. There are 11 reservoirs scattered throughout Victoria all varying in size (see Figure 1.0). Water Treatment Water from Melbourne's closed catchments requires minimal water treatment because of the isolation of the sources. Small amounts of chlorine are added to destroy any waterborne disease-causing microorganisms. ...read more.


From the major reservoirs, water either flows or is pumped through distribution mains to service reservoirs. There are about 55 service reservoirs throughout the metropolitan area. Service Reservoirs provide short-term storage of 1-2 days to ensure that water is constantly available even during peak demand periods. From the service reservoirs, water then flows through a smaller pipe system to metropolitan water businesses such as Yarra Valley Water whom then supply the water to homes, schools and businesses. Thousands of kilometres of pipes carry the water in a web-like network (See figure 1.1) and most of these pipes are underground. Figure 1.0-Map of the Melbourne Water Distribution System and Location of Catchments Sewage Treatment and Treatment Plants Everything that goes down the kitchen, laundry and bathroom drains, as well as what you flush down the toilet in Victoria either goes to the two treatments plants in Victoria the Western Treatment Plant and the Easter Treatment Plant. ...read more.


Anaerobic lagoons can produce unpleasant smells and release greenhouse gases. As sewage flows through one lagoon after another, more oxygen becomes available in the water. Some lagoons are aerated and as lagoons become more aerobic, smells become less of a problem. By the 10th lagoon, sewage is known as treated effluent and it is pumped out into Port Phillip Bay. Figure 1.1-Flow Diagram of Eastern Treatment Plant At the Eastern Treatment Plant a different system is used. Sewage is treated naturally at the Eastern Treatment Plant. Screens filter large objects and remove other solids using sedimentation. Then bacteria in different types of environment are used to break down organic material and to remove nutrients. (See Figure 1.1 for more details) The effluent at the Eastern Treatment plant is released to the environment at Boags Rocks together with treated effluent from South East Water's treatment plants at Rosebud, Mornington and Hastings. ?? ?? ?? ?? ...read more.

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