Sediment Control Log (SCL) Performance, Design and Decision Matrix for Field Applications

Many sediment control logs fail because of poorly understood performance limits and improper installation. The overall goals of the proposed project are to define the performance limits by determining the flow and sediment removal characteristics of different type of logs and to improve installation by developing a flow-chart decision matrix tool for selecting the best log for a given construction situation. The specific objectives of this project are to (1) determine hydraulic characteristics of sediment control logs constructed from different media and encasement fabrics, (2) evaluate the removal efficiency of sediment for these logs and the impact of trapped sediment on the hydraulic characteristics, (3) develop design guidelines for selection of sediment control logs based on the contributing areas, characteristics, sediment load, and longevity, and (4) coalesce the selection guidelines within a decision tree framework for use by field practitioners. The first objective will be completed by using an indoor test apparatus located at the University. A total of 20 sediment control logs will be evaluated. The second objective will be done by constructing a test apparatus for this activity. A subset of logs that represents a group of logs of objective 1 will be used to determine the removal efficiency of sediment for the logs. Objectives three and four will take experimental results and incorporate them into useful design tools. Physical theories will be used to estimate the flow rates and sediment load for different construction situations.