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Meaning of 50th Percentile ( median) Armour Stone Revetment Stone Size

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Michael Matkowsky

Civil/Environmental
Joined
Oct 5, 2018
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3
Location
CA
If a coastal engineer specified 4 to 5 ton armour stone and the construction had a range of sizes, say 3-5 ton and over
50 % of the stone was 4.5 ton or more, is the engineer's spec being satisfied ?
 
The way I have seen "median 50th percentile weight" (W50) used is a single number, say 4.5 tons. Then 50% of all the stones weight less than 4.5 tons and 50% of all the stones weigh more than 4.5 tons. All of the stones (100%) are within the specified 4 to 5 ton range.

[idea]
[r2d2]
 
Is there a limiting weight for the under size stone? Where do these rules come from ?
 
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