Catchment Sensitive Farming: Practical Tips

Practical Tip: Roofs for slurry and silage stores

Roofs for slurry stores

Self-supporting covers/roofs should conform with the Control of Pollution (Silage Slurry and Agricultural Fuel Oil) Regulations 1991 (as amended). They should have a minimum design life of 20 years (with maintenance) and satisfy the relevant British Standards. If a cover is fitted to an existing above-ground steel or concrete tank you should take advice from a structural or civil engineer, or specialist supplier to identify its condition and suitability. Installation should be carried out when the store is empty. Display appropriate signs to warn of the dangers of confined spaces and fragile roofs. Roof water should be directed away from the slurry store into a clean water drain. Further information is given in the leaflet The use of covers on circular steel and concrete slurry stores

Roofs for silage stores (clamp or silo)

If any part of the roof supporting structure forms part of the silo, you must discuss proposals with the Environment Agency since significantly altered silos must comply with the Control of Pollution (Silage Slurry and Agricultural Fuel Oil) Regulations 1991 (as amended). In any event, the construction of a roof and its supports should not allow silage effluent to escape from the silo. The roof and supports should comply with BS 5502 Buildings and structures for agriculture. Roof water should be directed away from the silo into a clean water drain.

Floating covers for slurry stores (tank and lagoon)

Suitable flexible heavy gauge fabric covers for slurry stores require specialist supply and fitting. They should be impermeable to prevent rainfall from entering the store and consequently may require a small pump to remove surplus rainwater collected on the surface of the cover. The cover should be secured to avoid wind damage and may be placed on floats depending on the surface area of the slurry. Installation should be carried out when the store is empty. Display appropriate signs to warn of the dangers of confined spaces and fragile covers.


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