Construction: large stone and riprap

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Riprap serves as a protective layer to: prevent sediment entering the underlying layers and clogging the LID facility, dissipate stormwater energy, and stabilize the terrain and slope.

Construction Steps:

  1. Backfill the material from the outside of the LID facility to avoid compaction.
  2. Ensure the material is being placed to the elevation and thickness to the design requirements.

Key Inspection Points:

  • Arrival of material to the site: material meets specifications as per design, no debris in the aggregate and, if possible, washed or clean stone with little to no fine materials in it.
  • Placement: material is backfilled to the right depth and elevation.

Common Mistakes to Avoid:

  • Use of wrong material that does not meet design specifications. If there are changes in the material, it must be approved by the supervisor or project manager.

Riprap