Approach Section Median Particle Size (D50) - Channel

The median stream bed soil particle size in feet (meters), i.e., D50, for the approach section channel. Refer to Chapter 14, Appendix B for more details 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