Riprap 10 : Rocks, pieces of used concrete, or other material of various sizes placed firmly or loosely on river banks to prevent scouring by the river, or on slopes or road cuts to prevent erosion
British Columbia Ministry of Forests and Range, Acronyms and Initialisms for Forestry Terms in British Columbia, Canada 2008. http://www.for.gov.bc.ca/hfd/library/documents/acr onyms/ & http://www.for.gov.bc.ca/hfd/library/documents/glo ssary/Glossary.pdf, (For Fr - Canad) {16}