Stone Traps

Concrete stone traps

Trap stones and debris before they enter your effluent tank

The Burford stone trap, sometimes known as a wedge by some in the industry, has been maufactured in Southland for over 12 years. There are a large number of stone traps at dairy sheds throughout Otago and Southland. 

Purpose of a stone trap

The stone trap is situated between the cowshed yard and the effluent tank. Stone traps are designed to slow down and direct the flow of effluent so sand, stones and debris can drop out. This will prevent blockages in the effluent pipe work, pumps, storage facilities and applicators. 

Stone traps are generally made of concrete and have a wide base which slopes down toward the pumping or draining end. The inlet is normally well above and on the opposite side of the stone trap to the outlet.

The solids that accumulate in the stone trap need to be regularly removed onto a sealed surface located directly beside the stone trap which drains any liquid back to the stone trap. The solids should be applied evenly to the land.

Burford stone traps are designed so that you can drive a 4WD front end loader into it to clean it out. The effluent from the stone trap then flows to a Burford open-top effluent tank where there is a pump mounted on a pontoon that will pump the effluent to an approved farm irrigator, or disposal system. These tanks will float in 400 - 500mm of water. 

Specifications of Burford's concrete stone trap

  • Internal width at the back wall is 2250mm
  • Internal width at front where tractor drives in is 2450mm
  • Internal height is 800mm
  • Area for placing stone trap is 2.9m x 3.6m x 900mm deep
  • There are 4 x 1.3 tonne ramset type lifters in the floor of the stone trap
  • The holes on each side are 150mm PVC sockets, that will take 150mm farm tuff pvc pipe
  • Weight is 4 tonne
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