Sediment Impact Assessments for the Rio Guanajibo at Mayaguez and San German, Puerto Rico.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1995
- Accession Number
- ADA293246
Entities
People
- William A. Thomas