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A method by which rainwater is collected from the surface [link widoczny dla zalogowanych] of roofs for ground water recharge or for storage in tanks is known as rooftop rainwater harvesting. [link widoczny dla zalogowanych] Required predominantly in parts where [link widoczny dla zalogowanych] [link widoczny dla zalogowanych] getting freshwater is [link widoczny dla zalogowanych] hard, it is widely practiced in dry lands, hilly, urban and coastal areas where it is wise to store water for use in future.
By practicing rooftop rainwater harvesting, we can reap a number of benefits including taking some pressure off storm drains to deal with rainwater runoff, reducing soil erosion, avoiding flooded roads and yards and decreasing contaminants and making the [link widoczny dla zalogowanych] quality of ground water better.
The typical rooftop rainwater harvesting system has the following things; the catchment, coarse meshes, gutters, [link widoczny dla zalogowanych] conduits, first flushing valves, filters and a tank or a sump.
The roof, off of which water flows into the harvesting system, is its catchment. Reinforced cement concrete roofs, galvanized steel and other metal corrugated sheet roofs are probably the best catchments for rainwater harvesting. Before water from the catchment enters the gutters, debris from it is gotten rid of by the coarse meshes.
Gutters and the conduit are both made of PVC or galvanized sheet. While gutters are [link widoczny dla zalogowanych] on the eaves of the roof, the conduit [link widoczny dla zalogowanych] is [link widoczny dla zalogowanych] the pipe-work that lies between the gutters and the tank and connects them. The size of the gutter and pipes depends on the amount [link widoczny dla zalogowanych] of water that must flow through them.
Water from the first spell of rain has to be discarded and not directed to the tank, as it will contain atmospheric contaminants as well as those from the surface of the roof. A diversion valve known as the first flush device performs this function.
Rainwater needs to be filtered before it [link widoczny dla zalogowanych] is used and filtering substances [link widoczny dla zalogowanych] like sand and charcoal are commonly used. Large filters containing a wall of pebbles followed by gravel [link widoczny dla zalogowanych] and sand are used when water is collected from a large [link widoczny dla zalogowanych] roof. The perforated pipe is at the centre of this arrangement and drains water into the pebbles first as it is the innermost arrangement.
Filtered water is stored in the sump and is chlorinated before use to ensure that it clean. This water can then even be passed through UV or RO filters so that it becomes suitable for drinking.