RP14: Yard inspection pit

Find out about eligibility and requirements for the yard inspection pit item.

How much will be paid

£200 per unit.

Where to use this item

Available for Mid Tier and Higher Tier


  • in areas targeted for the reduction of water pollution from agriculture
  • with support from a Catchment Sensitive Farming (CSF) officer

Where this item cannot be used

  • on covered or indoor yards
  • without relevant advice or consents from the Environment Agency (EA)

How this item will benefit the environment

This item will improve existing outdoor yards to reduce the risk of runoff and water pollution.


  • ensure that all work meets relevant British Standards - examine copies of the most up-to-date standards for guidance
  • build an inspection pit or a catch pit:

    • make sure the internal area of the pit is at least 0.36 square metres
    • make sure the pit opening is at least 600mm in diameter
    • build the pit onto a concrete base that is at least 250mm thick, with block walls rendered internally and externally
  • construct the pit walls with:

    • solid concrete blocks at least 200mm thick
    • engineering brickwork at least 200mm thick
    • proprietary precast reinforced concrete
    • proprietary plastic or uPVC liner with a concrete surround at least 150mm thick
  • make sure block walls are rendered internally and externally
  • install all proprietary items according to the manufacturer’s instructions to support the weight of traffic going over it
  • design the cover and frame to carry a load appropriate to its situation, e.g. in high traffic areas this must be at least 10 kilo newtons per square metre
  • embed the cover and frame securely so it is level with or is below the surrounding surface
  • build at least 10m from a slurry or silage store if this item has an open grating

Inspection pits:

  • the inspection pit channel must be benched half round, equal in diameter to the largest inlet pipe and extending the full length of the pit
  • the side connections must discharge in the direction of flow of the main channel

Catch pits:

  • install a pluggable catch pit and sump (at least 450mm deep with a submersible pump) at the point where clean drainage water leaves the yard
  • monitor the drainage water for contaminants

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
  • photographs of site before works start
  • 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 site during the different stages of construction or contracts, invoices or other documents confirming the technical specification for the completed works
  • photographs of the completed works in place and installed

Before applying, applicants must seek advice from EA to check if consent is required to carry out the planned work. Consent may be required if the works are designed to transfer slurry or silage effluent and need to meet water resources control of water pollution regulations. You do not need to provide this with your application, but you will need to submit consents or permissions with your payment claim. Applicants will have to send the following with their application:

  • written support from a CSF officer

This item can be used on the same area as the following items:

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.

The existing uncovered yards should be made from:

  • concrete
  • hard core
  • tarmac
  • bare earth

More detailed information about using this item is available through CSF. Applicants may also be able to request an infrastructure audit, slurry and manure handling plan, or pesticide handling or washdown facilities design plan.

Further information

The Rivers Trust has further guidance on dirty water separation.

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

See the Mid Tier manual or Higher Tier manual to find out more about the scheme and how to apply.

Published 2 April 2015
Last updated 10 March 2017 + show all updates
  1. Updated for 2017 applications.
  2. Information updated for applications in 2016.
  3. First published.