Approach Section Median Particle Size (D50) - Left Overbank
The median soil particle size of overbank in feet (meters), i.e., D50, for the approach section left overbank. Refer to Chapter 14, Appendix B for more details. Please note if the particle size is smaller than the limit for fine sand (0.0007 ft.), then evaluate the cohesive properties of the soil when estimating its critical velocity. The Office of Structures recommends obtaining the soil particle (D50) size for channel bed materials from the geomorphology report.