[Paddlewise] Residual resistance

I read this somewhere and asked the author where the formula below came
from.

 "Residual resistance (Rr) varies as the square of the Beam (B) and the
first power of Length (L):   Rr = B^2L."

I was told the formula came from someone who is a member of Paddlewise. Can
anyone tell me if this is a correct formula, and if so where it can be found
in the literature of Naval Architecture (so that I might be able to read
more about it). It doesn't look right to me but maybe there is something
similar out there and this is a typo (or something else is involved).

Matt Broze
www.marinerkayaks.com
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