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If you own lakeshore property in the Detroit Lakes area, shoreline erosion is not a hypothetical problem — it is something you can see happening season after season. Wave action, boat wakes, ice heave, and spring snowmelt runoff are relentless forces working against your bank. Riprap is one of the most effective and time-tested tools available for stopping that erosion and protecting both your property and the water quality of the lake.
Here is what you need to know about riprap — what it is, why it works, and why maintaining it matters as much as installing it correctly in the first place.
What Is Riprap?
Riprap is a layer of large natural rock — typically ranging from 6 to 30 inches in diameter — placed along a shoreline to absorb and deflect the energy of moving water. Unlike a retaining wall, which is a rigid vertical structure, riprap works by distributing the force of wave action across a sloped surface of interlocking stones. Water loses its energy as it moves through and around the rocks rather than hitting a hard surface and rebounding.
When installed correctly, riprap sits on a bed of filter fabric, crushed rock, or gravel that prevents the fine soil underneath from washing out through the gaps. The stone layer above protects the bank. The filter layer below protects the stone. Both layers working together is what gives a properly...
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