Rain Water Harvesting

Water is not produced or destroyed on this earth, it changes its phase like, liquid, solid and gas.

Rooftop rain water harvesting

Upon receiving some sort of external energy, water changes its phase and you can see water in different form like, sea, ice burgs, or vapour.

Water is limited and population is increasing day per day on the earth, therefore we need to save this water.

Rain Water Harvesting is one of the way of water save where,

We can store the rain water rather flowing anywhere else while raining.

Later on we can use this water for different purpose like gardening, irrigation etc.

Below are some effective techniques where we can harvest rain water in different way.

Rooftop Rainwater Harvesting

In this method, the rain water falls on the rooftop of your home or building.

The top of roof will work as a catchment of rain water and it directs the water in to a storage tank or a container which is connected to the rooftop.

This method is very easy and less expensive and you can implement it any where as per the system design.

Components of Rooftop Rainwater Harvesting

To build a successful rooftop rainwater harvesting, the below components are required.


It is the main component of a Rooftop Rainwater Harvesting system.

Rooftop Harvesting

It catches the rain water in to the funnels created, and feed the rain water in to the next part of the system.

As a catchments you can use different kind of pipes, tubes or you can create a cavity in your roof too.

When the rain water falls on the rooftop, it flows through catchment and run in to the next component through gravity itself.

Catchments is fixed on the roof, side of roof or can be mounted to the other systems where it can get the rain water easily.

However, you can use any of above as per your convenience.


when the rain water got to the catchment part it flows through the transportation system.

In transportation system, rain water passed through down takers of different sort of pipes.

It it the connecting media between the rooftop and the storage of water.

When the rain water is falls at top of roof,

The rain water passes through the transportation system and connects to the another component.

First Flush in Rain water Harvesting

We all knows that, 1st rain is dirty and with many pollutants and bad dissolved solids too.

once we establish the Rain water Harvesting system, we can should not required to maintain it in every season.

We can use the water as per our requirement from the storage area.

For that, we need to have clean water not up to the drinking level but at least we should use it for other purpose like gardening or irrigation.

When first rain water gets mixed with the clean water in the storage, it makes the entire water volume dirty in side the storage.

First flush is equipped with the Rain water harvesting system, to prevent this kind of problems in raining first time,.

It will direct the water to the other area or get the dirty water cleaned before it enters in to the storage area.

Both the methods are possible and you can implement it as per your convenience.

As a benefit of this component, you not need to worry on 1st rain and chances of spoilage of stored water.

Filter in Rain water Harvesting

filter as a component of rain water harvesting system

We must ensure that, the rain water gets clean as much as possible before it enters in to the storage area.

As rain water contains many odours, dust, microorganisms and other dirty particles in it.

We should filter the rain water before it gets mixed with the stored water.

Filters are used to clean the rain water for different kind of cleaning purpose.

Below are some of filters which are used in common to serve various purpose.

Sand Filters

These are commonly used filters to filter the water from dirty particles.

Sand filters are made of sand and Masonry brick and it is covered by a mesh system.

Their life is much shorter, but it will be available in market with very low cost.

Charcoal Filters

It is just same as sand filter with addition of charcoal.

This kind of filters are being used to remove bad Smells from Rain water.

PVC Pipe Filters

PVC Filters made from charcoal and sand filters.

Inside area of PVC filter is occupied by Sand and charcoal filters.

This kind of filters are used where there is very high flow of rain water.

Sponge Filters

Here, sponge is used in the middle area of drum.

It is a cheapest and easiest method to filter the Rain water.

This type of filters are used for domestic purpose.

Surface Runoff Harvesting

Rain Water Harvesting

This is a simplest type of Rain water harvesting.

Here, the Rain water falls on the earth and there is a mechanism to divert this water to a storage.

We can use this method very effectively and easily as it requires no skills and equipment.

However, You can make some sand funnels to diver the rain water to the storage area.

Here you need to put the storage area below the ground so water flows to the storage through gravity.

In Conclusion – Rain water Harvesting

With the medium of this blog, we knew the different methods and its components on Rain Water Harvesting.

Hope you will share this to other ones to spread awareness.

Still if you think something is missing related to the topic, you can always contact us.

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