Minimum specifications exist for farmyard drainage, concrete yards and roads. Separate drainage systems are required to deal with 3 types of liquid to be drained away from farmyards:
- Surface water systems – to divert all existing land drains around the farmyard site; to trap and drain clean rainwater, which may flow from higher ground when the soil is saturated; to dispose of rainwater from roofs or foul drains etc by discharging directly into a ditch, stream or river.
- Soiled water systems
- Silage effluent systems – to collect via channels and to pipe directly to an appropriate storage facility.
Inspection chambers, including manholes are recommended at all changes of direction in these systems. W T Knowles manhole covers can be used in this application.
In addition to the extensive range of clay pipes, junctions and gullies used to increase drainage in farmers fields (as detailed in the land and field drainage section), W T Knowles supplies an extensive range of sealing plates and grates for use with the gullies when installed in the farmyard and in barns.