Document Type


Publication Date

January 1985


Introduction: Newly constructed earth channels and steep cut and fill slopes on construction projects need temporary protection from water erosion until a protective cover of vegetation can be grown. In some instances the temporary protective measures can be left in position to serve as part of the permanent system. Various kinds of vegetative and chemical mulches are available for use as temporary control measures, and other materials such as jute, fiberglass roving, and excelsior blanket are also in use. However, for large volumes of flow and for high velocities, more substantial materials are required. One class of such materials is referred to as ECRM, or Erosion Control and Revegetation Mats. These are designed primarily for use on steep slopes and in drainage channels where high velocities of flow are encountered, and where mulches are not effective. Mirafi engineers, in cooperations with 3M Company, have developed an ECRM called Miramat, which is a flexible, three-dimensional web of bonded binyl monofilaments. Since commercial introduction, it has gained rapid market acceptance, but more information was desired on its performance capabilities and limitations. The objective of the present study was to conduct performance tests in the laboratory of two ECRMs, Miramat and Enkamat. one measure of the protective ability of such material is the flow velocity it can withstand before excessive erosion occurs. The determination of this permissible velocity was one of the objectives of these tests.