Riprap

• stone pitching is done with vegetation inter-planted between the stones; usually on gully floor
• It is made from variety of rock types, commonly granite or limestones, and occasionally concrete rubble from building.
• used to stabilize streambanks, provide in –stream channel stability and provide a stable outlet.
• absorb and deflect the energy of waves before they reach the defended structure.
• The vegetation like nilkanda, asuro, saiiwan, simali etc are grown.
• Riprap stone can be built at any time, but planting should be done before monsoon.
• Slopes on which riprap is used to stabilize streambanks should be no steeper than 1.5:1.