Kathleen M. Flynn Dannie L. Collins 1978 <p>The primary purpose of this report is to summarize and make available to other investigators the measured hydraulic data collected in the Flood Plain Simulation Facility located at the Gulf Coast Hydroscience Center, near Bay St. Louis, Miss., during a series of experiments designed to study steady and unsteady flow over uniform grass roughness. All experiments were conducted during the 1973 and 1974 test seasons. Tables of measured ground-surface elevations, water-surface elevations, and point velocities are included for all experiments. Bed roughness data in the form of grass heights and densities are tabulated. A total of 19 steady flow experiments and 7 unsteady flow experiments for varying grass heights are included. For the steady flow experiments, an average set of water-surface elevations and point velocity measurements are tabulated.&nbsp;</p><p>Inflow discharge hydrographs are tabulated for the unsteady flow experiments. The tabulated point velocities and water-surface elevations for the unsteady flow experiments were selected to represent the general changes in the flow variables as the flood wave passed through the facility but do not include all collected data. However, all data that were collected have been stored on computer disk storage and may be retrieved using the listing programs and memory locations.</p> application/pdf 10.3133/ofr78808 en U.S. Geological Survey A summary of measured hydraulic data for the series of steady and unsteady flow experiments over uniform grass roughness reports