Developed by T. Endreny at SUNY ESF in the Department of Environmental Resources Engineering
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# Explanation of Dominant Bed Material Exercise

### Exercise Objective

To assess the Rosgen Level II pebble count measurements for the single threaded Ouachita River Reach.

### Exercise Explanation

1. Pebble intermediate axis, diameter, and class data are shown below:
• Pebble 1 = y, 10.1 mm, gravel
• Pebble 2 = x, 16.8 mm, gravel
• Pebble 3 = z, 0.60 mm, sand
• Pebble 4 = y, 3.5 mm, gravel
• Pebble 5 = x, 74 mm, cobble
• Pebble 6 = y, 6.00 mm, gravel
• Pebble 7 = z, 0.065 mm, sand
• Pebble 8 = x, 1.37 mm, sand
• Pebble 9 = y, 0.67 mm, sand
• Pebble 10 = y, 17.8 mm, gravel
2. Predominant bed material is gravel with 5 counts, as revealed in the histogram image on this page.

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