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Re: Snow Drift Load

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I believe that Gary is refering to RWDI (Rowan Williams Davies & Irwin
Inc.) in Guelph, Ontario.  A company that I had worked for had used them
for some wind tunnel studies, including a snow drift load study for a
domed stadium.

HTH,

Scott
Adrian, MI


On Sat, 31 Jul 2004, Daryl Richardson wrote:

> Gary,
>
>         I think that may be right.  Thanks, Gary.
>
> Regards,
>
> H. Daryl Richardson
>
> Gary Hodgson & Associates wrote:
>
> > I think the firm is RWDP or something like that (starts
> > with an R) near the University of Guelph.  There is also
> > another firm there doing the same stuff. Also there is
> > the well-known wind lab at Unoversity of Western Ontario
> > in London (2 hours west of toronto).
> > Gary
> >
> > On 30 Jul 2004 at 14:11, Daryl Richardson wrote:
> >
> > > Mike,
> > >
> > >         Thanks for the complement.
> > >
> > >         My use of the term "major dissertation" was a feeble attempt
> > >         at
> > > humour due to my tendency to over verbalize.
> > >
> > >         I was actually present for part of the model study but it was
> > >         in
> > > 1975 or 1976. Even so I've probably forgotten most of the technically
> > > important details.  Essentially, the testing went something like the
> > > following.
> > >
> > > 1.    The scale was quite small, something in the order of 1" = 50',
> > > give or take.
> > >
> > > 2.    The tests were conducted in a water flume which was about three
> > > feet wide and, perhaps 12' long. The water was about 8" deep and the
> > > flow rate was about one or two feet per second.
> > >
> > > 3.    Sand was used in place of snow.  I don't remember the size; but
> > > it was fairly find.  I expect it would all pass a #100 screen.
> > >
> > > 4.    The model had to be reassembled for each different height of
> > > building above ground level.  Each model was tested for wind direction
> > > from at least 8 compass points.
> > >
> > > 5.    I don't remember how long the tests took; but it was a few
> > > hours, not a few minutes (Perhaps 4  hours).
> > >
> > >         Of course, as we all know, the scale, flow rate, viscosity,
> > >         sand
> > > density etc. etc. all have to have properly matched ratios
> > > model/prototype.  In all, I found the whole thing very interesting
> > > (Mr. Spock might even say "fascinating!").
> > >
> > >         The testing was done in a private testing lab owned by a
> > > consulting firm.  As I recall, there were four "partners or
> > > principals" and several or all were engineering professors at "Guelph
> > > University" (if I've got that name right), which is located a few
> > > miles (50 or so) west of Toronto, Ontario, Canada.
> > >
> > >         As far as cost is concerned I didn't have anything to do with
> > > the cost; I have no idea what it actually did cost.  That said, we can
> > > all make a reasonable guess.  Say 300 to 400 hours for engineer and/or
> > > technicians plus a month rent of the equipment plus a report.  Even
> > > considering that university types under value their own services it
> > > would not likely cost less than $50,000.00 if done today.
> > >
> > > Regards, Mike,
> > >
> > > H. Daryl Richardson
> > >
> > > "Michael L. Hemstad" wrote:
> > >
> > > > "......I hope this major dissertation is of some help to you.
> > > >
> > > > Regards,
> > > >
> > > > H. Daryl Richardson"
> > > >
> > > > Well, Daryl, I thought it was pretty cool.  Thanks.
> > > >
> > > > How does one go about conducting a model study like that?  Are there
> > > > Universities who do it, and roughly what does it cost?
> > > >
> > > > Mike Hemstad, P.E.
> > > > TKDA
> > > > St. Paul, Minnesota
> > > >
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