How to install Riprap properly is a cheat sheet and can be found here
Rip rap, also known as rip-rap, shot rock, rock armour or rubble, is rock or other material used to armor shorelines against water or ice erosion.Other uses for riprap can be found on a steep graded hill to prevent weather related erosion.
One benefit to riprap that might be overlooked is that it helps increase habitat for wildlife, specifically small creatures looking for shelter during wet weather.
A well-graded mixture of rock sizes should be used instead of one uniform size for graduation.Riprap material that is durable, so that freeze and thaw cycles don't break it in a short time, is the way to go for the quality of the stone.Make the riprap layer at least two times thicker than the maximum stone diameter.Before applying the riprap, you should apply a filter material.The underlying soil can't move through the riprap.There are limits to riprap.Riprap should be placed at a point where vegetation will be satisfactory to control erosion.Riprap should be five times the bottom width upstream and downstream of the curve and the entire curved section.The average size of the riprap material is 2 inches to 24 inches in diameter, but it can be much larger.Riprap will need an enclosure.Use chain link fencing or wire mesh to secure riprap installations on steep slopes or in high flow areas.
The steepness of the slope can cause riprap loss due to erosion and sliding.
After major storms, inspect riprap areas.Fix riprap as soon as possible to prevent a progressive failure.If the original design conditions have changed, evaluate the site to see if repairs are needed again.Weed and brush growth may need to be controlled.
Smaller riprap stones are ideal for a driveway or gravel parking lot.They are durable enough to endure wear, but not too bumpy.This size helps weed control by keeping soil from being eroded near ditches.The base of a tree is one of the uses.