Transcription of LOOSE RIPRAP PROTECTION - USDA
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LOOSE RIPRAP PROTECTION - USDA
United States Department of Agriculture Soil Conservation Service St. Paul, Minnesota LOOSE RIPRAP PROTECTION Minnesota Technical Note 3 July 1989 FOREWORD The Soil Conservation Service in Minnesota is pleased to present this revised copy of Minnesota Technical Release #3, " LOOSE RIPRAP PROTECTION ". The document was revised to add background information, examples, and a glossary and to expand the bibliography. The changes in the design procedure are those that remove references to allowable velocity procedures and replace them with tractive stress evaluations. This technical release is not meant to be used for the design of rock chutes, nor lined channels steeper than 5-6%. New research data from Colorado State University is being reviewed by National Headquarters for development of new RIPRAP design procedures. Some of the research done is mentioned in this document but no specific design recommendations are given. This document is also not meant for the design of side inlet channels These tend to be sites with smaller drainage areas and steeper slopes that can tolerate a higher level of risk than in a channel lining situation.
* Presence of excess hydrostatic (pore) pressure. * Loss of foundation support at the toe of the riprap blanket caused by erosion of the lower part of the riprap blanket (reference 13). The failure of riprap referred to as modified slump is the mass movement of material along an internal slip surface within the riprap blanket.
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