02 Oct Imbricated Stone
Applications of Imbricated Stone
Boulder revetments are sloped stone walls designed to absorb the impact of incoming water flow. Revetments protect existing shorelines and slopes. Imbricated rip rap is constructed similar to revetments. However, imbricated stone walls are built high enough to completely protect the stream bank.
The steps in building an imbricated stone streambank are as follows:
1. Grade the streambank to the desired angle.
2. Trench the toe (bottom) of the bank for the installation of the footer stones.
3. Install geotextile fabric from the top of the bank down to the footer trench.
4. Place the footer stones on top of the fabric in the trench.
5. Build the wall over the footer stone with each stone overlapping the one below by a half.
6. Transition top of bank soil into imbricated stone wall and stabilize.
Advantages of Imbricated Stone
Using imbricated stone in lieu of other methods include:
• Less space requirements for angled walls. The stones can be installed at a slight angle and still provide soil stability. Practical for almost all streambanks.
• Attractive option for streambank perimeters at lakes and parks.
• Economical solution as compared to standard concrete retaining wall.
Additional uses of imbricated stone are inclusive of:
• Outfall Stabilization – Fast flowing water may be dissipated by stone walls. However, hill slopes may be fashioned to contain outfall pipes to mitigate water flow. The outfall pipes can be supported with imbricated stones.
• Step Pools – Channel rocks are lined in a continuous series with deeper pool areas between each series of rocks. Water flows down the vortex shaped arrangements in a series of short drops. A process similar to walking down stairs. Channel stability is provided for during massive flood events.
• Stone Toe – This measure prevents undermining at the bottom of stream banks. Soil fabric may be installed on top of the stone toe to provide for a vegetated streambank.
Bulk Delivery Options
The bulk source of these site construction materials come from stone quarries. The stones are often transported from the quarries by trucks or railroad cars. Local deliveries are made using dump trucks, while flatbed trailers are used for longer distances.
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