Groins
Groins are placed perpendicular to the shoreline to slow the water current and allow sand to settle and accumulate. Groins should be placed with a gap between them equal to 150 to 200% of their length. This will allow for a fairly even beach to form without large gaps along the shoreline. Sand will still shift up and down the groin field with wind and tide changes. The groins will act to hold the existing sand of the beach that was once washed downstream only to be replaced by sand from the eroding bank. With a bulkhead installed to stop bank erosion, the existing beach would probably wash away without a groin field or other structures to hold it in place.