Rip Rap Specification

[CPENG78]

Hello All,
Need your help on rip rap specifications. I am sizing rip rap for an outfall and carried out the calculation using US Federal Highway standards. This results in rip rap of classes 1 - 6. Does anyone know how would that translate into CA DOT Caltrans rock gradation. Caltrans has it separated into unit weight of rock. Thank you.

 

[MiketheEngineer]

Call CAL-trans and get their specs. Remember to write the name and phone number of the person you talk to.

 

[boo1]

try

http://www.dot.ca.gov/hq/oppd/hydrology/ca_riprap.pdf

 

[cvg]

assuming you calculated D50 size and want to convert to caltrans weight spec, you will need to assume SG=2.5 (or another value if you have a specific quarry in mind), assume your rock is approximately spherical and then calculate weight of the rock using the equation for volume of a sphere. Alternatively, you can assume a cube shape. Recommend using nothing smaller than light class. Also, keep in mind that the caltrans spec is not "percent passing" but "percent larger".

 

[CPENG78]

Thank you all.