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Haha interesting twist here: 1.5"-3" stone will work from an engineering perspective, however the local municipality has specified that the stones must be "too large for someone to pickup and throw".

Thanks again everyone.

I appreciate everyone's input. Upon further clarification from our client, psmart was exactly right! The situation calls for a single sized rock with 40% voids. We have no fines, just a constant grain size. Intuitively I would say that this is only dependent on the shape of the rock just as...

psmart- I mean a void ratio of 0.4, what you have suggested is a void ratio of 0.67.

Hello- At my office we need to specify the size of a rock going into a small channel for filtration. The void ratio has been specified for us at 0.4, so how would we determine the rock size? Thank you, Kevin