Explain any three types of water harvesting system
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Direct-Pumped (Submersible)
This is the most common type of more professional rainwater harvesting system, particularly for domestic properties, and is generally the easiest to install. The pump is located within the underground tank and harvested water is simply pumped directly to the WCs or other appliances. If the tank should be in danger of running dry, a small amount of mains water is fed to it in order to maintain supply. For commercial projects, such systems tend to be dual pump arrangements (dutystandby).
Direct-Pumped (Suction)
This system differs in that the pump is not inside the tank, but instead is located within a control unit within the house (e.g. utility room). The unit also deals with the backup from mains water supply, so there is no need to send mains water down to the tank.
Indirect Gravity
This type of system differs in that the harvested water is first pumped to a high level tank (header tank), then allowed to supply the outlets by gravity alone. With this arrangement, the pump only has to work when the header tank needs filling. Also the mains water is fed directly to the header tank, not into the main harvesting tank.
Indirect Pumped
This arrangement is similar to the above, except that the internal tank can be at any level in the building, as it does not rely on gravity to supply the outlets. Instead a booster pump set is used to provide a pressurised supply. This system employs the benefit of not having to feed mains back-up water to the underground tank, whilst also offering great flexibility as the booster pumps can be tailored to suit the flow and pressure requirements of the building.
Gravity Only
In some situations It may be possible to have a system that functions purely through gravity, requiring no pump and therefore no energy use. With this arrangement, rainwater is collected from a part of the roof which has gutters above the filter and collection tank which are in turn above all the outlets. This arrangement is ONLY ever possible where the storage tank can be located below the level of the gutters, yet higher that the outlets that it will supply. Only the power of gravity is needed to feed collected and filtered water to various parts of the home for use, so it is an ultra-energy efficient option.
This is the most common type of more professional rainwater harvesting system, particularly for domestic properties, and is generally the easiest to install. The pump is located within the underground tank and harvested water is simply pumped directly to the WCs or other appliances. If the tank should be in danger of running dry, a small amount of mains water is fed to it in order to maintain supply. For commercial projects, such systems tend to be dual pump arrangements (dutystandby).
Direct-Pumped (Suction)
This system differs in that the pump is not inside the tank, but instead is located within a control unit within the house (e.g. utility room). The unit also deals with the backup from mains water supply, so there is no need to send mains water down to the tank.
Indirect Gravity
This type of system differs in that the harvested water is first pumped to a high level tank (header tank), then allowed to supply the outlets by gravity alone. With this arrangement, the pump only has to work when the header tank needs filling. Also the mains water is fed directly to the header tank, not into the main harvesting tank.
Indirect Pumped
This arrangement is similar to the above, except that the internal tank can be at any level in the building, as it does not rely on gravity to supply the outlets. Instead a booster pump set is used to provide a pressurised supply. This system employs the benefit of not having to feed mains back-up water to the underground tank, whilst also offering great flexibility as the booster pumps can be tailored to suit the flow and pressure requirements of the building.
Gravity Only
In some situations It may be possible to have a system that functions purely through gravity, requiring no pump and therefore no energy use. With this arrangement, rainwater is collected from a part of the roof which has gutters above the filter and collection tank which are in turn above all the outlets. This arrangement is ONLY ever possible where the storage tank can be located below the level of the gutters, yet higher that the outlets that it will supply. Only the power of gravity is needed to feed collected and filtered water to various parts of the home for use, so it is an ultra-energy efficient option.
veduhbhatt2003:
thank you but it is not helpful to me
why
i explain it
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Three types of water harvesting system are :
1.) direct pumped
2.) indirect pumped
3.)indirect gravity.
Hope it helped!!!
1.) direct pumped
2.) indirect pumped
3.)indirect gravity.
Hope it helped!!!
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