Materials of Construction of Rain Water Harvesting System

Various materials can be used for different components of a rainwater harvesting system. These are given below:

Roof: The Rainwater can be collected from the roof made of clay tiles or cement plastered surface. Metal roofing can also be used. We can paint the roof material to reduce its porosity. Avoid using lead based paint, as it will provide chance for leaching of lead into harvested rainwater. Other roofing materials such as composite asphalt, asbestos and concrete tiles which might leach chemicals that affect the quality of water harvested.Gutters and connecting pipes: Gutters are generally made up of seamless extruded aluminum. The Galvanized iron or PVC are commonly used for connecting pipes.

Leaf Screens: Leaf screens are wire mesh of suitable thickness with metal or plastic frame.

Graded filter: The structure for filter could be masonry, concrete or plastic. This structure will be filled.

Tank or Storage structure: Masonry, concrete, plastic, steel and fiberglass are the generally recommended materials for storage structure. The material should be inert and durable. Depending on the intended use, like water for gardening, we can use open ponds lined with polythene sheets. Such innovations will greatly reduce the cost.

Water Treatment System: For non potable uses, simple cartridge filters are sufficient. If the rainwater is used for drinking purposes, a tank for chlorination or a zone of UV light for disinfection of water should installed.

Distribution System: The distribution piping is generally made of galvanized iron.

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