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RP30

Floating covers for slurry and anaerobic digestate stores and lagoons

Capital Items open_in_new View on RPA Website

£2.75

per square metre · one-off

info Summary

This Capital Grant (RP30) provides funding for installing floating covers on slurry and anaerobic digestate stores and lagoons to reduce slurry volume, improve air quality by cutting ammonia emissions, and enhance biodiversity.

format_list_bulleted What to do

  • Install a rainproof floating cover with a minimum design life of 5 years on a slurry or anaerobic digestate store or tank.
  • Ensure the store's banks can support the cover and fastenings.
  • Install the cover when the store is empty.
  • Direct rainwater away from the cover into a clean water drain or harvesting system.
  • Display warning signs for confined spaces and fragile covers.
  • Secure the cover against wind damage and prevent rainwater mixing with slurry.
  • Meet SSAFO regulations 2010 and, if applicable, NVZ requirements.
  • Regularly remove rainwater from the cover and ensure it can rise uniformly.

schedule When to do

  • Before starting any work, get advice from the Environment Agency regarding SSAFO regulations for new/altered stores.
  • Obtain relevant advice, consents, or permits from the Environment Agency.
  • Contact your local planning authority to check if planning permission is needed.

checklist How to do and evidence required

You must keep written support from your Catchment Sensitive Farming adviser and provide this with your application.

You must also keep and provide with your claim:

  • photographs of the completed work
  • any consents or permissions connected with the work
  • any consents or permissions from the local planning authority, or evidence that you do not need consent or permission from your local planning authority

If you do not need consent or permission from your local planning authority, you must provide evidence to show this. This can be a:

  • letter from the authority confirming you do not need permission
  • note of a telephone conversation with a local authority representative, with the name, date, and time of the call
  • link to online guidance or printout of guidance text which shows you do not need permission

You must also keep and provide on request:

  • receipted invoices or bank statements where a receipted invoice is unavailable
  • photographs of the site before works start

Read the record keeping and site visit requirements in the Agreement holder’s guide: Capital Grants, Higher Tier capital grants and Protection and Infrastructure grants for more information.

If you’re applying for this item as part of a Countryside Stewardship Higher Tier (CSHT) application, read the record keeping and site visit requirements in the CSHT agreement holder’s guide.

tips_and_updates Additional Advice

  • Check work meets relevant British Standards.
  • Ensure slurry stores meet SSAFO regulations 2010 for design, construction, and maintenance.
  • Maintain drains to transport rainwater to clean water ditches and prevent mixing with slurry/digestate, potentially using a pump.
  • Refer to the Rivers Trust guidance for separating water and slurry.

View Official Guidelines

Access detailed information about this action on the RPA website

open_in_new Visit RPA Website

info Additional Information

RP30: Floating covers for slurry and anaerobic digestate stores and lagoons

This item is part of Capital Grants 2025. You must read the Capital Grants 2025 guidance to understand the rules and how to apply.

If you’re applying for this item as part of a Countryside Stewardship Higher Tier (CSHT) application, you must read the CSHT applicant’s guide to understand the rules and how to apply.

How much you’ll be paid

£2.75 per square metre (m2).

How this item benefits the environment

A floating cover for slurry and on-farm anaerobic digestate stores and lagoons helps reduce the volume of slurry you need to store and spread. It also improves air quality by reducing ammonia emissions.

This item can help you protect, recover and improve biodiversity on your land.

Where you can use this item

You can only use this item with support from Catchment Sensitive Farming:

  • in areas targeted for the reduction of water and air pollution from agriculture
  • to cover existing slurry or on-farm anaerobic digestate stores or lagoons

Before you start any work, you must get advice from the Environment Agency to check what’s required as new and significantly altered stores will have to meet the silage, slurry and agricultural fuel oil (SSAFO) regulations 2010.

Get permission to use this item

You’ll need to get relevant advice, consents or permits from the Environment Agency before starting any work.

You must also contact your local planning authority to check if planning permission is needed.

What you must do to use this item

You must:

  • install a floating cover with a minimum design life of 5 years (with maintenance)
  • install a rainproof floating cover on a slurry or anaerobic digestate store or tank
  • make sure the tanks or the lagoon’s earth banks can support the cover and fastening implements
  • install the cover when the store is empty
  • direct the rainwater away from the cover into a clean water drain or rainwater harvesting system
  • display warning signs to warn of the dangers of confined spaces and fragile covers
  • secure the cover to avoid wind damage and prevent rainwater running off and mixing with slurry
  • place the cover on floats only if needed
  • meet the requirements of the SSAFO regulations 2010 and, if applicable, Nitrate Vulnerable Zone (NVZ) requirements
  • regularly remove rainwater from the cover to ensure it does not mix with the slurry
  • ensure the cover is not impeded and it can rise uniformly

Evidence you must keep

You must keep written support from your Catchment Sensitive Farming adviser and provide this with your application.

You must also keep and provide with your claim:

  • photographs of the completed work
  • any consents or permissions connected with the work
  • any consents or permissions from the local planning authority, or evidence that you do not need consent or permission from your local planning authority

If you do not need consent or permission from your local planning authority, you must provide evidence to show this. This can be a:

  • letter from the authority confirming you do not need permission
  • note of a telephone conversation with a local authority representative, with the name, date, and time of the call
  • link to online guidance or printout of guidance text which shows you do not need permission

You must also keep and provide on request:

  • receipted invoices or bank statements where a receipted invoice is unavailable
  • photographs of the site before works start

Read the record keeping and site visit requirements in the Agreement holder’s guide: Capital Grants, Higher Tier capital grants and Protection and Infrastructure grants for more information.

If you’re applying for this item as part of a Countryside Stewardship Higher Tier (CSHT) application, read the record keeping and site visit requirements in the CSHT agreement holder’s guide.

Advice to help you use this item

The following advice may help you to use this item, but you do not have to follow it to get paid. It’s not part of this item’s requirements.

British Standards

Check to make sure the work meets relevant British Standards.

Regulations for slurry stores

The slurry stores should meet the silage, slurry and agricultural fuel oil (SSAFO) regulations 2010 regulations which cover the design, construction and maintenance of the stores.

Maintaining the drains

Drains should take rainwater from the cover and transport it to clean water ditches and drains. The drains need to prevent the rainwater from mixing with slurry or digestate. You may need a pump to help transport the water.

Separating water and slurry

Read about separating water and slurry at the Rivers Trust.

Questions about RP30?

Ask Tom anything about this subsidy, eligibility, evidence requirements, or compatibility with other actions.