Abstract
Water is a basic normal asset for supporting the condition of life. Accessible water assets are feeling the squeeze because of expanding demand. Soon water, which we have depended upon to be accessible and an unconditional present of nature will turn into a rare product. Protection and conservation of water assets are desperately required. In many parts of Victoria, water supply to communities is limited. Rainwater harvesting systems can provide water at or near the point of demand. The systems can be owner and utility operated and managed. Rainwater collected using existing structures, i.e. rooftops, parking lots, playgrounds, parks, ponds, floodplains etc., has few negative environmental impacts compared to other technologies for water resources development. Rainwater is relatively clean and the quality is usually acceptable for many purposes with little or even no treatment. The physical and chemical properties of rainwater are usually superior to sources of groundwater that may have been subjected to contamination. The present study was intended to measure the rooftop rainwater harvesting potential using GIS techniques. The GIS examination utilized in this investigation was basically an efficient assessment of rooftop water collecting in the chose Wollert which is a suburb in Melbourne, Victoria. With the use of GIS it was conceivable to appraise the aggregate sum of water harvestable at the household level. It is very tedious work to assess the catchments available for rooftop rainwater harvesting. Here the roof surfaces are the catchments and GIS is employed to calculate the area of various types of roofs and their potential for planning for the area under study. As a result Eucalypt Estate Wollert has huge potential and can make above 179.11 litres water available per person per day throughout the year.
Highlights
Rainwater harvesting from rooftops of houses used to be an ancient practice in arid zones
The Geographic Information System (GIS) examination utilized in this investigation was basically an efficient assessment of rooftop water collecting in the chose Wollert which is a suburb in Melbourne, Victoria
It is scientifically proved that, through this rooftop rainwater harvesting method, water scarcity can be minimized to a certain extent and water collected can be used for drinking and domestic purposes
Summary
Rainwater harvesting from rooftops of houses used to be an ancient practice in arid zones It is a welcome practice in rural-urban areas especially where the rainfall is very scarce and irregular. Melbourne residents are encouraged to contain their daily water use to a maximum of 155 litres per day per person. This includes an allowance for garden watering. In modern days the roof water is stored in a sump or recharged into the local aquifer This kind of practice directly used for recharging the local aquifer is becoming popular in urban and rural areas for mitigating water scarcity in semi-arid areas where annual rainfall is barely 500 mm [3]
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