Rock Weir and Sock Dam symbolRock weirs (a pile of stones lined up to slow down the flow of water on a hill) and compost filter sock check dams are used in place of traditional sediment and erosion control such as silt fences and straw bales. They:

Compost sock dam holding rainwater

  • are used to control and keep sediment from soil erosion from flowing downhill, as is the case in newly constructed rain gardens or bioswales where soil has been exposed.
  • slow the velocity of the flow of water, either at the inlet to the rain garden, the overflow of a rain garden or on a slope, thus reducing the potential for erosion.
  • when placed at intervals along a bioswale, they slow down the velocity of water flowing through a bioswale.
  • when used on hard surfaces, they prevent sediment from flowing into other areas.
  • aid infiltration of water into the soil by slowing water flow.

For more details on how and when to use filter sock check dams and weirs, see Stabilize Steep Slopes.

Click on a landscaping option from the graphic below to learn more about that topic:

RainScaping graphic

lawn alternatives green roof soil amendments yard management woodland restoration creek corridor vegetative buffer rain garden bioswale rock weirs and sock dams rainwater harvesting permeable pavers