Rainwater harvesting

Rainwater harvesting

Recover up to 40% of your water usage
with a rainwater harvesting system

Water bills, particularly for livestock farmers, can be extremely costly. That’s why more and more farmers are now using rainwater harvesting systems. Not only do they help you recover up to 40% of your water costs but they also enable you to do your bit for the environment too.

To help you get started, we’ve pulled together some useful information on grants available, tax incentives, the benefits of harvesting rainwater and the things you need to consider when choosing a system. And if you’re in need of some expert advice, simply give us a call.

Interested to know more?

Speak to our Rainwater harvesting experts to make sure you get the most efficient solution for your needs

What grants are available?

There are various grants available to farmers for water management systems. Here’s just a few examples:

This list will not include all the grants currently available and you will need to look into them in greater depth to understand whether you are eligible for them and which products they cover. Please let us know if you hear of any other grants too and we will add them to this list.

What is Enhanced Capital Allowance (ECA)?

The Enhanced Capital Allowance (ECA) scheme offers a 100% first-year allowance for investments in certain water efficient plant and machinery, such as rainwater harvesting.

This allowance enables you to write off 100% of the cost of your rainwater harvesting system against taxable profits in the year of purchase. This can help you save money as well as reduce your impact on the environment.

The ECA water scheme is managed by the Defra and HM Revenue & Customs, (HMRC) in partnership with AEA Technology, who manage the scheme on behalf of Defra. The ECA water scheme includes a variety of technologies, such as water efficient taps, toilets, monitoring equipment and industrial cleaning equipment. Eligible products are detailed on the Water Technology List (WTL). To find out more, please click here.

Interested to know more?

Speak to our Rainwater harvesting experts to make sure you get the most efficient solution for your needs

Why Harvest Rainwater?

It's free

You’ve heard the expression “money doesn’t grow on trees” but it does quite literally fall from the sky. You could recover up to 40% of your farm’s water usage by simply collecting rainwater.

Environmentally friendly

Doing your bit for the environment could be a help to your business. For example, some of the UK’s biggest supermarkets are already auditing their suppliers based on their carbon footprint.

Water shortage protection

In the UK, we’re seeing more and more extreme weather. Water shortages are also likely to become a more common problem in the future according to Water UK.

Better for crops

Rainwater is far better than mains water for crops and plants because it hasn’t been cleaned with chlorine’s and other chemicals and is considered to be far better for irrigation.

Improves drainage

Farms using rainwater harvesting systems have also reported improvements in their drainage and a reduction in the amount of water going into their Slurry Stores.

Can be used to feed livestock

It’s a common myth that harvested rainwater cannot be used for livestock feeding. With the right filters in place, rainwater can be made safe.

Case study: Livestock farm saved money

The owner of Birch Hall Farm, Andrew Gilman, needed a rainwater harvesting solution to help him:

• Meet environmental initiatives

• Reduce the farm’s water bill

Andrew was unsure which rainwater harvesting system would be suitable for his needs, especially because he wanted to use the water collected as a drinking source for his livestock. Read how we helped him with our Gravistore system.

Read more

Birch Hall Farm

"We expect our rainwater harvesting system to pay for itself within the next 5-8 years. I would happily recommend Cotterills to other farmers. Nothing was ever too much trouble and their down to earth approach meant they were a pleasure to deal with."

– Andrew Gilman –

How to choose a system?

Choosing a rainwater harvesting solution can be confusing. There are a number of factors to consider. These include:

  • the size of your roof area (length and width)
  • the pitch of your roof (e.g. grass roof=0.3, flat roof=0.6, standard pitched roof=0.8)
  • the amount of rainwater likely to fall in your area (see guide below)
  • what the rainwater will be used for (e.g. livestock feeding, irrigation etc.)


Interested to know more?

Speak to our Rainwater harvesting experts to make sure you get the most efficient solution for your needs

Here’s a rough guide to amount of rainwater (mm) that is likely to fall in your area.

To get more specific figures visit the Met Office website.

England 880 Wales 1494 Scotland 1651 N Ireland 1223
England and Wales 955 England N 1024 England S 804 Scotland N 1718
Scotland E 1299 Scotland W 1931 England E & NE 819 England NW 1307
Midlands 784 East Anglia 591 England SW & Wales S 1325 England SE & S 836

We have a wide range of rainwater harvesting systems available to suit your specific needs. If you’d like assistance in identifying the best one for you, please get in touch.

Interested to know more?

Speak to our Rainwater harvesting experts to make sure you get the most efficient solution for your needs