Accession Number : ADA293246

Title :   Sediment Impact Assessments for the Rio Guanajibo at Mayaguez and San German, Puerto Rico.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB

Personal Author(s) : Thomas, William A.

PDF Url : ADA293246

Report Date : JAN 1995

Pagination or Media Count : 67

Abstract : This sediment impact assessment was conducted for two protection projects on the Rio Guanajibo. San German is a channel modification project designed for a 10-year level of protection. The existing channel was analyzed using five stability tests in the computer program, 'Hydraulic Design Package for Channels' (SAM), and found to be stable because the historical inflowing sediment discharge was sufficiently high to prevent erosion of the channel bed. The proposed project channel is wider than the existing channel and has a flatter slope. The analytical method for stable channel design indicated deposition would occur, and the sediment yield study predicted a trap efficiency of 59 percent. That trap efficiency is sufficiently high that a detailed sedimentation study should be conducted. Project reliability during the passage of the design flood event was tested using a sediment budget approach, also. The calculated trap efficiency is 33 percent. This is expected to cause about 1/3 m of deposition, most of which comes after the peak discharge, and the project is judged to be reliable. (MM)

Descriptors :   *SEDIMENT TRANSPORT, *CHANNELS(WATERWAYS), *SOIL STABILIZATION, *FLOOD CONTROL, COMPUTER PROGRAMS, MATHEMATICAL MODELS, DRAINAGE, ROUTING, RIVERS, BANKS(WATERWAYS), DESIGN CRITERIA, SOIL EROSION, FLOODING, CHANNEL FLOW, HYDRAULIC MODELS, SLOPE STABILITY, SEDIMENTATION, STREAMFLOW ANALYSIS, LEVEES, TRAPS, FLOOD PLAINS, PUERTO RICO.

Subject Categories : Hydrology, Limnology and Potamology
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE