Locating Your Trail Bridge for Longevity
Long Description for Figure 17
Graphic showing typical site survey with labels that read: Shot, Ground Shot, Bottom of bank, Top of bank, TBM, Permanent control point, Shots that form equilateral triangles produce a more accurate contour map, Permanent control point, Permanent control point. This graphic also contains a section of notes which are:
- This example plan is for a typical site. More complex sites with flood plains will require additional shits and ground shots.
- More complex sites will require an additional 50 feet of trail CL beyond what is shown here.
- More complex steams will require 300 feet upstream and 300 feet downstream of survey from the proposed bridge location.
- Set three control points that are intervisible out of the project area and a temporary bench mark (TBM).
- Take bankfull indicator shots.