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What are the best techniques we can follow for rainwater harvesting?

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Install down take pipes to collect rainwater from rooftop and make provision to collect in ground level sump after filter arrangements. Even surface water runoff after sediment or silt trap arrangements can be let into another groud level sump to collect water. 
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For people needs in one area, we can build dam for water preservation and for underland water stock when the area get long dry season. For home needs, we can have it accommodated in a closed big tank and use it for everyday life.
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I have not paid attention to doing this. I just let our plastic drums open when it is raining. When it rains, it pours directly into these big containers.
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Some common techniques for rainwater harvesting include rooftop catchment systems, rain gardens, permeable paving, and rain barrels/cisterns.
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Rainwater harvesting is the process of collecting and storing rainwater for future use. Here are some of the best techniques for rainwater harvesting:

Roof catchment: The most common technique for rainwater harvesting is to collect rainwater from the roof of a building. The roof is sloped to direct rainwater towards gutters and downspouts, which lead to a storage tank.

Surface catchment: If you have a large, flat surface such as a driveway or a courtyard, you can use it to collect rainwater. The surface should be sloped towards a collection point, which leads to a storage tank.

Contour harvesting: Contour harvesting involves creating small dams or berms on contour lines, which allow rainwater to collect and infiltrate into the soil. This technique is useful for areas with hilly terrain.

Infiltration pits: Infiltration pits are dug in the ground to collect and store rainwater. The pits are lined with gravel and sand to allow water to infiltrate into the soil.

Rain gardens: A rain garden is a shallow depression planted with native plants that can absorb and filter rainwater. It is designed to slow down and absorb rainwater runoff from a roof, driveway or other impervious surfaces.

Cisterns: A cistern is a large storage tank that can hold a significant amount of rainwater. They can be buried underground or installed aboveground, and can be used for both indoor and outdoor water use.

It is important to design your rainwater harvesting system based on your specific needs, the size of your property, the climate in your area, and the amount of rainfall you receive. A well-designed rainwater harvesting system can provide a sustainable source of water for a variety of uses, including irrigation, toilet flushing, and laundry.
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The 2 main ways of harvesting rainwater are collecting it from roofs and collecting surface runoff—the water that flows off and when it rains. When this water is harvested it can be used for farming and domestic activities. After water is harvested from various watersheds, it is conveyed to storage reservoirs.
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There are a number of techniques that can be used to harvest rainwater, including:

1. Collect rainwater using a sky-light or overhead light system.

2. Collect rainwater using a gravity system or machine that pulls rainwater up from the ground.

3. Collect rainwater using a system that includes a rain garden.

4. Collect rainwater using a system that uses bubbling and slow-flow techniques.

5. Use rainwater to make water distribution systems.
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There are two major ways of harvesting rainwater 

1 surface runoff harvesting.In this techniques rainwater flows away as surface runoff and can be stored in tank to be used later.

2. Groundwater recharge. This is a hydrologic process of water running from the surface downward to underground.
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  • Rainwater harvesting techniques include rooftop collection, surface runoff harvesting, ponds/lakes, agricultural methods, percolation tanks, recharge wells/pits, check dams/bunds, rain gardens/bioswales, greywater harvesting, and promoting education/awareness
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Rainwater harvesting is the process of collecting, storing, and utilizing rainwater for various purposes. Here are some techniques that can be followed for rainwater harvesting:

Rooftop harvesting: The most common and easiest technique is to collect rainwater from the rooftop of buildings. The roof should be sloping and made of material that is conducive to water collection. The rainwater can be collected in a tank, which can be used for various purposes.

Surface runoff harvesting: This technique involves collecting rainwater that runs off from surfaces like roads, pavements, and parks. The rainwater can be collected in trenches or channels, which can be directed towards storage tanks or recharge pits.

Recharge pits: Recharge pits are dug in the ground to collect rainwater and allow it to seep into the ground. This technique helps recharge groundwater, which is essential for maintaining water levels in wells and borewells.

Percolation tanks: Percolation tanks are large pits that are dug in the ground to store rainwater. The rainwater is allowed to percolate into the ground, recharging the groundwater table.

Check dams: Check dams are small barriers that are constructed across streams or small rivers to slow down the flow of water. This technique helps retain water in the area, allowing it to seep into the ground and recharge groundwater levels.

Artificial recharge: This technique involves injecting treated rainwater into wells or borewells, which helps recharge groundwater levels.

These are some of the techniques that can be followed for rainwater harvesting. The choice of technique will depend on factors like the availability of space, the amount of rainfall, and the purpose of rainwater harvesting.
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Roof catchment: The most common technique for rainwater harvesting is to collect rainwater from the roof of a building. The roof is sloped to direct rainwater towards gutters and downspouts, which lead to a storage tank.
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