What are the methods of modern roof top harvesting
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RAINWATER OVERHEAD TANKS
These are the simple tanks placed over the building or on the terrace, collecting water as it comes. Very expensive installation.
ROOFTOP RAINWATER HARVESTING
A simple structure where the roof is used as a support for installing catchment pipes through which the rain water flows and is eventually stored in ground level containers for direct use or recharged into ground water.
FERRO-CEMENT TANKS
This is a low-cost alternative for expensive water harvesting containers made of masonry, plastic and RCC. It has proved highly effective in high rainfall regions where large amount of water needs to be stored in clean form.
RAIN WATER SYRINGE
Most of the open wells and tube wells in coastal areas contain salty water due to seepage of sea water. Rainwater harvesting is a viable option for solving the issue of drinking water, but construction of rainwater overhead tanks is unaffordable for marginal farmers.
GROUND WATER DAMS
This method of rainwater harvesting is used majorly in places where the underground water level varies. A dam is constructed underground to obstruct the flow of underground water and create a reservoir to store water.
During the rains, the water percolates from the surface and reaches these underground reservoirs, increasing the water level by a considerable amount. The main advantage of these underground reservoirs is that the water is not polluted by the contaminants in the air. Also, the water stored underground does not reduce by way of evaporation.
These are the simple tanks placed over the building or on the terrace, collecting water as it comes. Very expensive installation.
ROOFTOP RAINWATER HARVESTING
A simple structure where the roof is used as a support for installing catchment pipes through which the rain water flows and is eventually stored in ground level containers for direct use or recharged into ground water.
FERRO-CEMENT TANKS
This is a low-cost alternative for expensive water harvesting containers made of masonry, plastic and RCC. It has proved highly effective in high rainfall regions where large amount of water needs to be stored in clean form.
RAIN WATER SYRINGE
Most of the open wells and tube wells in coastal areas contain salty water due to seepage of sea water. Rainwater harvesting is a viable option for solving the issue of drinking water, but construction of rainwater overhead tanks is unaffordable for marginal farmers.
GROUND WATER DAMS
This method of rainwater harvesting is used majorly in places where the underground water level varies. A dam is constructed underground to obstruct the flow of underground water and create a reservoir to store water.
During the rains, the water percolates from the surface and reaches these underground reservoirs, increasing the water level by a considerable amount. The main advantage of these underground reservoirs is that the water is not polluted by the contaminants in the air. Also, the water stored underground does not reduce by way of evaporation.
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