RainWater Harvesting

N kavya

Rainwater harvesting is a sustainable process that helps in preserving water for future needs. Water scarcity is a major concern in today’s scenario. The process of rainwater harvesting is a good way to conserve water. Rainwater Harvesting is one of the most used methods to save water. It refers to storing rainwater for various uses. The notion behind rainwater harvesting is to not waste the rainwater and prevent it from running off. In other words, it is done to collect rainwater using simple mechanisms. It is usually collected at the place the rain falls from the ground or rooftops. Rainwater harvesting is an alternative to reduce the stress of public water supply sources. The recharge of rainwater to the ground in the coastal regions prevents seawater immersion into the freshwater. Finally, rainwater harvesting reduces water supply bills.

Rainwater Filtration -:

Rainwater can be harvested or purified in multiple ways. The catch area before harvesting must be cleaned thoroughly, and the pipelined must be flushed regularly. Initially, the water flow is diverted to wash or rinse the area.
Rainwater contains contaminants or other waste materials that affect the quality of the water. Contaminants such as dust, Bird excreta, pollution, leaves, and sand particles can affect water quality.

Filtration removes contaminants and other impurities and purifies rainwater for drinking and other purposes. However, the harvested water must be treated and tested before consumption to ensure the right quality check.
Industries use the practice of pre-filtration to ensure that the purified water is directed water to the tank. The pre-filtration measure is a vital step that the water supply system should not compromise in terms of water quality.

Some techniques of rainwater purification are solar sterilization, the use of chemicals like iodine or chlorine, or sediment filtration. However, harvested rainwater used for drinking purposes can be filtered through Reverse Osmosis (RO).

Favorable aspects of Rainwater Harvesting -:

Rainwater Harvesting positively affects underground water quality. It dilutes the number of nitrates, fluorides, and salinity of the underground water. It contains zero hardness and almost neutral pH, making it highly suitable for industries, homes, institutions, industries, and other commercial establishments. Rainwater Harvesting reduces water supply bills. It is an excellent method that solves the water shortage crisis and lessens the energy consumption in water disturbance. Rooftop Rainwater harvesting controls urban flooding. The recharge of rainwater to the ground in the coastal regions prevents seawater immersion into the freshwater. Rainwater harvesting is an alternative to reduce the stress of public water supply sources. Construction of deeper wells can damage the natural environment as well as upscale. Therefore, the source of rainwater is highly effective and dependable. Stored harvested rainwater can be used as an alternative to municipal water and used during the water crisis.

Rainwater harvesting can be done in a variety of methods, including -:

1. A watershed is a region where precipitation flows directly into a river or another reservoir.
2. There are two ways to keep water: on the roof or the ground.
3. Normally, rainwater is collected on the rooftops. The rainwater from the roof is usually collected in PVC pipes and stored in a sump (a deep pit dug into the earth) or a tank.
4. The water in the tank can then be used for home purposes after it has been filtered.
5. Rainwater collection also helps to restore natural aquifers.

The two types of rainwater harvesting -:

1. Surface runoff harvesting -:

In this method, rainwater flows away as surface runoff and can be stored for future use. Surface water can be stored by diverting the flow of small creeks and streams into reservoirs on the surface or underground. It can provide water for farming, cattle, and for general domestic use. Surface runoff harvesting is most suitable in urban areas.
Rooftop rainwater/storm runoff can be harvested in urban areas through:
• Recharge Pit
• Recharge Trench
• Tubewell
• Recharge Well

Groundwater recharge -:

Groundwater recharge is a hydrologic process where water moves downward from surface water to groundwater. Recharge is the primary method through which water enters an aquifer. The aquifer also serves as a distribution system. The surplus rainwater can then be used to recharge Grothe underwater aquifer through artificial recharge techniques.

3. Rainwater in rural areas can be harvested through -:

• Gully Plug
• Contour Bund
• Dugwell Recharge
• Percolation Tank
• Check Dam/Cement Plug/Nala Bund
• Recharge Shaft

Although rainwater harvesting measure is deemed to be a desirable concept for the last few years, it is rarely implemented in rural India. Different regions of the country practiced a variety of rainwater harvesting and artificial recharge methods. Some ancient rainwater harvesting methods followed in India includes Madaras, Ahar Pynes, Surangas, Taankas, etc.

Advantages of Rainwater Harvesting -:

1. Less cost.
2. Helps in reducing the water bill.
3. Decreases the water demand.
4. Reduces the need for imported water.
5. Promotes both water and energy conservation.
6. Improves the quality and quantity of groundwater.
7. Does not require a filtration system for landscape irrigation.
8. This technology is simple and easy to install and operate.
9. It reduces soil erosion, stormwater runoff, flooding, and pollution of surface water with fertilizers, pesticides, metals, and other sediments.
10. It is an excellent source of water for landscape irrigation with no chemicals, or dissolved salts, and is free from all minerals.

Disadvantages of Rainwater Harvesting-:

1. In addition to the great advantages, the rainwater harvesting system has a few disadvantages like unpredictable rainfall, unavailability of the proper storage system, etc.
2. Listed below are a few more disadvantages of the rainwater harvesting process.
3. Regular maintenance is required.
4. Requires some technical skills for installation.
5. Limited and no rainfall can limit the supply of rainwater.
6. If not installed correctly, it may attract mosquitoes and other waterborne diseases. 7. One of the significant drawbacks of the rainwater harvesting system is storage limits.

The world faces an increasingly critical need to address climate change, and the impact that water conservation has on a sustainable environment is undeniable. Groundwater is the primary source of freshwater that caters to the demand of the ever-growing domestic, agrarian, and industrial sectors of the country. Over the years, it has been observed that the necessity for the exploitation of groundwater resources for various everyday needs, like toileting, bathing, cleaning, agriculture, drinking water, industrial and ever-changing lifestyles with modernization is leading to tremendous water wastage. Harvesting and collecting rainwater is an adequate strategy that can be used to address the problem of water crisis globally. The use of a rainwater harvesting system provides excellent merits for every community. This simple water conservation method can be a boost to an incredible solution in areas where there is enough rainfall but not enough supply of groundwater. It will not only provide the most sustainable and efficient means of water management but also unlock the vista of several other economic activities leading to the Empowerment of people at the grass-root level.

For this, the Government should come out with an appropriate incentive structure and logistic assistance to make it a real success. Rainwater harvesting is something that thousands of families across the world should participate in rather than pinning hopes on the administration to fight the water crisis. This water conservation method is a simple and effective process with numerous benefits that can be easily practiced in individual homes, apartments, parks, and across the world. As we all know that charity begins at home, likewise, a contribution to society’s welfare must be initiated from one’s home.