Analysis and Design Scope

D

Item D: Analysis and Design
Analysis of software and calculation is critical for the design process. Once modeling is complete, analysis including other software will be used to develop a full understanding of the low water crossing parameters. The design process incorporates all learned parameters from modeling and analysis to develop design alternative for the low water crossing’s enhancements. The client’s needs and suggestions will be considered in the design direction and alternatives.

D.1

AutoCAD:
AutoCAD will be used to help establish the project site and certain parameters of the project site. The watershed that affects the project area will be delineated. This delineation will be used in HEC-HMS to estimate flooding values and state what times of the year seem to have the most trouble with flooding. AutoCAD will not be used for any other design reasons besides the deliverable listed above.

D.2

Armoring Existing Crossing:
Currently there is minimal armoring up and down stream of the low water crossing. It is the job of the engineers to determine the appropriate additional armoring needed to protect the low water crossing from damage brought upon by heavy discharge. Based upon modeling data, the appropriate armoring needed for the stream will be based on velocities of the stream, Reynolds’ Roughness Coefficient, and the available materials. Stream armoring is usually associated with rocks and boulders that will prevent erosion along the stream bed or obstructions that are used to slow the velocities up-stream to prevent erosion and scouring. Stream armoring will be initial construction with the new crossing design, but will also have a heavy emphasis in maintenance of the crossing.