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Waterway and wetland permits: traditional riprap erosion control

Riprap is a blanket of appropriately sized stones, fitted to the slope and shape of the shoreline, extending from the toe of the slope to a height needed for long-term durability. It is appropriate where long-term durability is needed, design discharge is high, and there is no practical way to otherwise to use vegetation in the design.

Traditional RiprapOther stabilization techniques and vegetation plantings should be used as appropriate to stabilize the upper bank and to ensure a source of shoreline vegetation. Riprap is flexible and not impaired by slight movement from settlement and other adjustments.

Any hard structure modifies the shoreline, and with increasing rates of occurrence will lead to homogenization of shoreline habitat. In other words, a lake that is entirely riprapped has less variety of habitat than a lake with a natural mix of shore habitats. As part of an overall picture of development intensity within a lake and its surrounding watershed, increases in shore structures are correlated with changes in whole-lake fish assemblage.

Last revised: Thursday October 31 2013