RP29: Self supporting covers for slurry stores

Find out about eligibility and requirements for the self supporting covers for slurry stores item.

How much will be paid

£30.50 per square metre.

Where to use this item

Available for Mid Tier and Higher Tier


  • in areas targeted for the reduction of water pollution from agriculture
  • for roofing an existing above ground circular store
  • with support from a Catchment Sensitive Farming (CSF) officer

Where this item cannot be used

  • for existing square or rectangular slurry stores
  • for floating covers
  • to cover any structure other than a slurry store
  • without relevant advice or consents from the Environment Agency (EA) or Local Planning Authority

How this item will benefit the environment

This item will provide a self-supporting cover to an existing circular slurry store. This will stop rainwater from entering slurry stores and reduce the volume of dirty water that needs to be stored and spread.


  • install a self-supporting cover with a minimum design life of 20 years (with maintenance)
  • install a rainproof, self-supporting cover, supported above the slurry store and fastened by tensioners to the side of the tank
  • make sure the tank is able to support the cover
  • install the cover when the store is empty
  • direct the rainwater away from the slurry store into a clean water drain or rainwater harvesting system
  • display appropriate signs to warn of the dangers of confined spaces and fragile covers
  • meet the requirements of the SSAFO regulations 2010 and Nitrate Vulnerable Zone (NVZ) requirements
  • meet relevant British Standards - examine copies of the most up-to-date standards for guidance

Keeping records

Agreement holders will need to keep the following records and supply them on request:

  • any consents or permissions connected with the work
  • receipted invoices, or bank statements where a receipted invoice is unavailable
  • please see the record keeping and inspection requirements as set out in the Mid Tier manual for more detail

Agreement holders will need to keep the following records and supply them with the claim:

  • photographs of the completed work

Before applying, applicants must seek advice from:

Applicants will have to send the following with their application:

  • a copy of any advice, permit or consent received from the EA or the Local Planning Authority
  • photographs of the existing site
  • written support from a CSF officer

Advice and suggestions for how to carry out this item

The following section gives advice on carrying out this item successfully but does not form part of the requirements for this item.

How to get more detailed advice

Further design advice is available on how to size the loading and washdown area and holding tanks, and on pesticide washing volume calculations, from CSF.

Consult an engineer before using this item

Before work is carried out, a structural or civil engineer must check that the existing store is able to support a cover. A specialist supplier or tank manufacturer should be consulted.

Further information

More information about separating clean and dirty water is available from the Rivers Trust.

More information on using covers on circular slurry stores is available.

Catchment Sensitive Farming (CSF) operates in parts of the country where there are water quality issues linked to farming. The scheme provides farmers with free advice and training. See guidance for further information on CSF support

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