How to harvest rainwater for agriculture


Farmers could harvest water through percolation tank which is an artificially created water body, or through gully plugs where bunds are created across small gullies and streams carrying water to tiny catchments during the rainy season, and also through channelling filtered water from fields to dug wells to store it. Compiled by Safina Buhari.

To collect as much of the rainwater as possible, install a larger tank or connect several rain barrels together so that the overflow from a full barrel can be routed into empty barrels. An overflow outlet at the top of the barrel can be designed to channel the excess water when the barrel is full.


What is the best way to harvest rainwater?

You will need 7 basic components to harvest rainwater:

  • Catchment Surface – The catchment surface refers to the roof which will collect rainwater. …
  • Roof-Washing and First Flush System – Since your catchment surface will be exposed to the elements, it will surely become dirty. …
  • Storage Tanks – Obviously, you will need one or more storage tanks to store your water. …

More items…

Why collecting rainwater is bad?

Rainwater Collection

  • Rainwater might not be safe for household use without additional treatment. Before using collected rainwater for drinking, bathing, or cooking, consider whether treatment is needed to make it safe.
  • Regularly test your collected rainwater and maintain your rainwater system. …
  • Check local regulations and guidance.

How can I harvest rainwater to use in my home?

Then you need to do the following in order to determine how much water you can collect:

  • Calculate the ‘flat area’ of the roof, which is usually the same as the footprint of the house below
  • Then multiply the rainfall by the roof area
  • Finally deduct 20% for evaporation and overflow will give us the figure we need

What are the problems of harvesting rainwater?

– Prospects and Challenges

  • Frequency of rainfall
  • The quantity of rainfall
  • The way of collecting rainwater
  • Size of resource to collect water

What are the techniques of rain water harvesting?

Methods of Rooftop Rainwater HarvestingStorage of Direct Use. In this method, rainwater collected from the roof of the building is diverted to a storage tank. … Recharging Groundwater Aquifers. … Recharging of Bore Wells. … Recharge Pits. … Soakway or Recharge Shafts. … Recharging of Dug Wells. … Recharge Trenches. … Percolation Tank.

What is the easiest method of rainwater harvesting?

The easiest way to harvest rain is through a rain barrel (make your own from a large trash can or an old drum) linked to a pipe fitted to collect rainwater from the rooftop and verandah of the house.To prevent the barrel from becoming a mosquito breeding ground, fasten a tight-fitting top to it, and screen the ends of …

How do you collect rainwater in a field?

0:496:35FREE Water Best Ways to Collect Rainwater – YouTubeYouTubeStart of suggested clipEnd of suggested clipWater a more effective method is to use a tarpaulin. Or other waterproof surface slanted at an angleMoreWater a more effective method is to use a tarpaulin. Or other waterproof surface slanted at an angle to feed into a collection vessel setups like this can harvest a surprising volume of water.

How do you capture rainwater for gardening?

Collecting rainwater can be as simple as a downspout flowing into a barrel outfitted with a spigot, or it can be as elaborate as a series of pipes connected to a tank or cistern hooked to a pump for redistribution. The most common method to collect rainwater is off a roof.

Which of the following is the best method of water harvesting?

1. Rain Water Barrels: The most commonly followed method of rainwater harvesting, it simply involves setting up a collection barrel near the downspout of a runoff gutter.

What are the disadvantages of rainwater harvesting?

Disadvantages of Rainwater HarvestingRegular maintenance is required.Requires some technical skills for installation.Limited and no rainfall can limit the supply of rainwater.If not installed correctly, it may attract mosquitoes and other waterborne diseases.More items…

How long can you store rainwater for plants?

about one weekYou probably know the benefits of using rainwater for plants, but how long can you keep it and use it on your plants? Generally, rainwater will become contaminated after about one week. You can prolong its lifetime indefinitely by keeping it out of the light and from animal and insect contact.

How do you preserve rain water?

How to Conserve Water This Rainy SeasonStore Rainwater in Drums. … Direct Rainwater Runoff to Plants. … Make a Roof Garden. … Set Bowls to Collect Water in Different Locations. … Make a Rain Saucer. … Place Outside All Items that Need a Rinse. … Let Your Borewell Get Refilled Too.More items…•

Is collected rain water good for plants?

The truth is that rainwater is not only beneficial but also recommended for your gardening. This is because this water contains no salts or minerals, and it is considered the purest type of water. Since rainwater is so clean, it is one of the best hydration sources for your plants.

Is rainwater harvesting worth it?

So how much money can I save using rainwater? Rainwater replaces, on average, around 40-50% of your mains water usage, so a property owner can realistically expect to make a saving of around 45% on their water bills. This is a pretty hefty amount!

How do you collect and store rainwater for plants?

0:274:34How I collect, filter out & store rainwater for my plants – YouTubeYouTubeStart of suggested clipEnd of suggested clipBut this is the way I filter it now I collected in this one or I collect it in my five gallonMoreBut this is the way I filter it now I collected in this one or I collect it in my five gallon buckets as well. These are the five gallon buckets we rinsed out we just go ahead and recycle them.

What is rainwater harvesting?

Rainwater harvesting is the practice of collecting and storing rain for reuse, rather than letting the water run off and be absorbed into the ground or channeled into drains, streams, or rivers. It is one of the easiest ways to conserve water at home while also lowering your bills. Whether you opt for a custom-designed system …

Why is rainwater harvesting important?

Rainwater harvesting has a host of benefits beyond reducing demand on local freshwater resources. By collecting rainwater during a storm, there’s less stormwater runoff, which can overwhelm local sewage systems and result in local pollutants making their way to rivers and streams, lakes and ponds, and out into the ocean.

What is a rain barrel?

A basic system that collects rainwater from a roof via downspouts and a barrel or tank is ideal for outdoor use — for watering plants or other outdoor chores. These systems don’t require much more maintenance than typical gutter-cleaning upkeep.

How does collecting rainwater help?

Collecting rainwater can also reduce erosion in especially very dry environments where it is common, and reduce flooding in low-lying areas. Of course, if you pay for water from a municipal source, harvesting your own will save you money on your water bill.

What is grey water used for?

Grey water can be recycled on-site at a home, apartment building, office, or a hotel, and it can be used for toilet flushing (after which it’s called black water), garden or lawn watering, or for crops. Grey water reuse is often designed into a rainwater harvesting system as a way to make the harvested water go farther, …

What materials are used to harvest rainwater?

The best materials for roofs that will be used to harvest rainwater are slate, aluminum, and galvanized iron. Finally, you will need to install piping into your house to bring your stored rainwater to the appliances or faucets where you want to use the water.

Why is rain water filtered?

Harvested rainwater can be used in almost every way water from a well or other supply can be used. If the water is to be used for drinking (potable), food preparation, or other direct human consumption, it needs to be filtered to improve the flavor and remove pathogens, grit, and other particles.

Bore well water recharge

What is a borewell recharge?:

Boulder check dam

The film describes the construction of boulder checks for treating small streams and gullies under watershed interventions.

Continuous Contour Trench (CCT)

What is a CCT?

Drip irrigation

ZZ2 is a South African agricultural group that grows fruits and vegetables. They began working with Netafim almost 25 years ago, and have seen yields increase by more than 20 tons per hectare. Today ZZ2 farms over 3800 hectares of tomatoes, avocados, mangos and onions – all with drip irrigation.

Stone line (bund)

Burkina Faso, Mali, Niger – Stone lines or (“bunds”) slow down runoff, incerease water infiltration and for the basis for improved production in semi-arid areas. At the same time, sediment is captured behind these semi-permeable barriers.

Tree planting (extreme environments)

Amazingly quick reforestation results achieved by the Salgado family and the Instituto Terra in Brazil. Photo: Sebastian Salgado

How to adopt a landscape watershed approach to sustainable l and and water management

Tamera, Portugal: Sepp Holzer and Bernd Mueller explain the construction, the effect and the basic ideas for the construction of a water retention landscape: a local and natural solution to the global problem of disturbed water balance.

What is a landscape technique used in permaculture to maximize the natural resource of rainwater on your land?

A landscape technique used in Permaculture to maximize the natural resource of rainwater on your land is Keyline Design . Which designates a topographic feature related to the natural flow pattern of water that flows through your land.

What is the method used to revegetate barren lands?

Robert Dixon has been experimenting and having great success with a simple way to fast-track the revegetation of barren lands since 1976 — with a technique called ‘Imprinting’. This method uses the “Edge Effect” by “Imprinting” patterns to the soil.

What is a swale trench?

Swales. A Swale is a trench used in permaculture to irrigate farmland, mitigating stormwater runoff, reduce erosion, and improve soil quality. Swales changes the pattern of the water from overland flow to an underground flow. Changing the flow, reducing and redirecting the water to where you need the rainwater. 2.

What is rainwater harvesting?

Rainwater harvesting is a system of collection and storage of rainwater into natural reservoirs or tanks, or the infiltration of surface water into subsurface aquifers ( before it is lost as surface runoff). One technique of rainwater harvesting is rooftop harvesting. Other uses include water for gardens, livestock, & irrigation, etc.

Why is rainwater harvesting important?

Harvesting rainwater makes sense for a variety of economic & environmental reasons: Rainwater harvesting will improve water supply, food production, & ultimately food security. Water insecure individuals in rural areas will advantage the most of rainwater harvesting systems.

How is rainwater collected from a roof?

In rooftop harvesting, the roof becomes the catchments, & the rainwater is collected from the roof of the house or building. It can either be stored in a tank or diverted to an artificial recharge scheme. This technique is less expensive if implemented properly helps in augmenting the ground water level of the area.

How many rainwater harvesting structures are there in Chennai?

On 30 May 2014, the state government announced that it will set up 50,000 rainwater harvesting structures at different parts of the capital city of Chennai. Around 4,000 temples in Tamil Nadu state traditionally had water tanks that were used for different rituals.

What is a rain barrel?

Rain barrels: It is the easiest and affordable technique of rainwater harvesting, especially at home. It is where water tanks installed below the downspouts of the rooftop guttering system. The water is then funneled or directed into the tanks.

What is the filter on a rainwater storage tank?

After the first flushing of rainfall, water should pass during filters. A gravel, sand and ‘netlon’ mesh filter are designed & placed on top of the storage tank. This filter is important in keeping the rainwater in the storage tank clean.

What is the purpose of collecting rainwater?

Harvesting and collection of rainwater is a proper method that can be used to address the problem of the water crisis in various parts of the world. This water conservation technique can be used to put forward a remarkable solution in areas where there is enough rainfall but not enough supply of groundwater.

Rainwater Harvesting for Agriculture

Agricultural Rainwater Harvesting is becoming increasingly popular for arable and livestock farmers. For arable farmers, rainwater is softer than means water so is more efficient with mixing agriculture chemicals and therefore saving on chemical conditioners.

Rainwater Tanks for Arable Farms

Other uses for plastic water tanks for arable farms including as bulk water tanks for agriculture sprayers. With sprayers getting larger a plastic water tank can make filling the sprayer easier and quicker with the bonus of free rainwater. These sprayer tanks are available with a 2″ or 3″ valve c/w male Camlock coupler to connect to the sprayer.

Rainwater tanks for livestock farms

Other uses for plastic water tanks for livestock farms as well as for agriculture sprayers include water for dairy washdown, livestock watering, pressure washing and plate cooling systems. In many dairy flood wash systems are popular for which rainwater harvested water can be used.

How Does Agricultural Rainwater Harvesting Systems Work?

A rainwater storage tank is fitted to the roof downpipe and the rain enters the tank through a rainwater filter which removes leaves, moss twigs and other debris from the water. This debris flows over a screen in the rainwater filter and flows down the overflow to the drain or sock away.

Points to Consider for an Agricultural Rainwater Harvesting System

Rainwater starts with the roof area you can collect water from and whether the roof and guttering are situated in a position to bring the water down at the same point to run to the rainwater filter and then into the tank.

Rainwater Harvesting Tanks for Farms

We manufacture a wide range of storage tanks suitable for rainwater Harvesting. These tanks are either;

Above Ground Rainwater Harvesting Systems

A typical above-ground vertical above ground tank, filter and overflow system would be as follows.

How is rainwater collected?

Rainwater is collected from the roof, filtered and piped by gravity to a storage (header) tank. Water is delivered to appliances via gravity. Mains top-up water can also be fitted if needed.

Why are water resources scarce in England?

Yet in many parts of England and Wales water resources are already scarce and are likely to become even scarcer as a result of climate change. It’s the Environment Agency’s job to manage water resources and to plan to ensure that there is enough for people and the environment.

How many cows are there in the Yarra Valley?

The farm consists of 96 ha of land in total and has 70 milking cows, 70 followers and 100 ewes. Crops grown are maize and barley to use as cattle feed.

How often should I overflow my fish tank?

It is also recommended that the tank should be sized, so that it overflows at least twice a year to remove floating debris.

What are the regulations for mains water supply?

Where mains water supply is used on any premises in the UK, the Water Supply (Water Fittings) Regulations (1999) (or Byelaws 2000 in Scotland) must be adhered to. These regulations prevent the misuse, waste, undue consumption or erroneous measurement of water and most importantly, prevent contamination of drinkingwater through cross-connections, backflow or back siphonage into the mains from non-mains sources, including harvested rainwater. In addition, water supplied that is not for drinking must be clearly marked. Using a plumber approved by WIAPS9, should ensure this. More information can be obtained from the Water Regulation Advisory Scheme (WRAS) 10.

What is a clay reservoir?

Where water is collected over a large area, such as on polythene tunnels or glasshouses, a clay or synthetic lined reservoir is often used. More information on what you need to consider before constructing a reservoir can be found in ‘Thinking of an Irrigation Reservoir’ booklet.

Do you need to filter rainwater before putting it in a storage tank?

It is recommended that rainwater is filtered before entry into the storage tank. The filter should be easy to clean (or self-cleansing) and should not block easily. If you require high quality water, then additional filtration is also required after the storage tank.

What is rainwater harvesting?

Rainwater harvesting is an option irrigators, landscape management companies, and property managers should offer commercial and residential clients. Familiarize yourself with all options for rainwater collection systems and the calculations. Contact rainwater collection professionals to design and install rainwater collection systems. The American Rainwater Catchment System Association (ARCSA) and Texas A&M AgriLife Extension is the education and certifying organization for rainwater professionals. Their web site is Visit this web site for a list of professionals. Many states have rainwater collection state associations that umbrella under ARCSA, so check for state associations. Texas Rainwater Catchment Association is at Texas A&M University AgriLife Extension Rainwater Harvesting Team is a leader in education about rainwater harvesting. This team has created a web site with information including pictures, videos and many fact sheets and publications. Visit this informative site as Check these web sites often because new technology for rainwater harvesting is developing daily as the demand for systems increase through the county and the world.

Why is it important to capture rainwater?

Some cities and states are encouraging rainwater capture particularly for summer irrigation when water use increases anywhere from 25 to 60%. This increase is attributed to irrigation. As population growth and development continues to strain water resources, landscape water conservation is not just an issue but a necessity. Future landscapes must conserve water to be sustainable. In urban areas, harvesting rainwater for irrigation will take the strain off municipal water supplies, delay building expensive new water treatment plants, and reduce flooding, erosion and stormwater contamination. In rural areas, rainwater harvesting is an optional supply for potable water when no other source is available and as a water supply for firefighting, livestock and wildlife.

What is the main water source for an irrigation system?

For a new irrigation system, the main line water source is the water from the cistern. For existing irrigation systems, disconnect the main line from the potable water source and connect the main line to the cistern.

What is supplemental water?

If the catchment area is not large enough to collect enough water for irrigation, a supplemental water resource is required. Supplemental water or Back-up water is from another water source, municipal or groundwater. Cross contamination with potable water must be avoided using a backflow prevention device. Attached the supplemental water near the top of the cistern with a six inch air gap between the opening for the back-up water to the top of the overflow pipe. Check with the city to see if they also require a backflow prevention device in the potable water line.


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