Erosion Control Mats: An overview of the use and features of various types of erosion control mats including a proposed classification system that allows the various mats to be grouped into three classes. Includes discussion on the desirable features of a mat when it is used in various site conditions, and the key hydraulic parameters of allowable flow velocity & allowable shear stress. Description, purpose, limitations, advantages, disadvantages, special requirements, site inspection, installation, maintenance and removal. Fig=2; photos=13; tables=15