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<p>Roel,</p>
<p>I'm not an expert in this field of liquid precipitation, but here
are my thoughts in response to your comments:</p>
<p>1) I'm not aware of drastic differences in rainfall between the
airport and more urban areas of a city. However, there are
noticeable differences in wind speeds for which, in the absence of
measured data, are accounted for in building energy modeling by
TERRAIN-PARAMETERs dependent on the general site description,
e.g., 1.00 for flat terrain such as an airport, 0.85 for rural,
0.67 for urban or forest, and 0.47 for urban centers with tall
building, and the height difference between the measured data and
the site. if you're having difficulty in finding either measured
wind speed or driving rain data (good luck!), I would suggest you
just use the airport data and adjust that with a Terrain
Parameter.</p>
<p>2) If you insist on getting rain and wind speed data for a
suburban location, I'm sure those can be found among the 8,000+
weather stations for which I have hourly weather data, but the
locations would be anywhere in the world. Do you care where is
the location? <br>
</p>
<p>3) The Met Eirerann paper describes a driving rain index, but
does not provide the equation. In thinking about it again (note
that I've only thought about this after reading your original
query), I think a plausible approach would be:</p>
<p> a. find the approximate downward velocity of falling rain (a
quick web search for "How fast do raindrops fall" gave the answer
of 10 m/sec)</p>
<p> b. divide that by the (adjusted) wind speed to get the
fraction that would fall on a vertical surface, i.e., driving
rain.</p>
<p> c. multiply the "driving rain fraction" by the reported rain
fall to get the amount of driving rain.<br>
</p>
<p> c. use the wind direction to apportion the driving rain by the
wall orientation. <br>
</p>
<p>It's still not clear to me what is the primary motivation for
your investigation. Is it to determine the amount of driving rain
at a particular location or weather file? to validate the method
to calculate driving rain? Or to just get a handle on how much
driving rain is there ?</p>
<p>Joe<br>
</p>
<pre class="moz-signature" cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>
<a class="moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
</pre>
<div class="moz-cite-prefix">On 7/18/2018 5:43 AM, Roel Tersteeg
wrote:<br>
</div>
<blockquote type="cite"
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<div class="WordSection1">
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Dear
Joe and Luis,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Thank
you for your replies to my question and apologies for my
very late reply to you both. Unfortunately the data from
official, synoptic weather stations is airfield data and
thus not applicable to my situation as there is no
difference in microclimate (no changes in wind or rainfall
due to surrounding building). The same goes for the Met
Eireann information (if of interest, the Climatological
notes 13 and 3 about wind driven rain can also be found and
downloaded here as well: <a
href="https://www.met.ie/education/publications/climatological-notes"
moz-do-not-send="true">
https://www.met.ie/education/publications/climatological-notes</a>)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I
am looking specific for wind driven rain data, or indeed
combined wind and precipitation data that can be converted
to wind driven rain, for different (sub)urban settings. The
suggestion for looking at ‘personal weather stations’ is
very interesting, although this has the issue of uncertainty
about the quality of the measurements.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal">Kind regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Roel <o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> Luis Miguel Blanes Restoy
<a class="moz-txt-link-rfc2396E" href="mailto:lmblanes@gmail.com"><lmblanes@gmail.com></a>
<br>
<b>Sent:</b> 06 July 2018 14:34<br>
<b>To:</b> Joe Huang
<a class="moz-txt-link-rfc2396E" href="mailto:yjhuang@whiteboxtechnologies.com"><yjhuang@whiteboxtechnologies.com></a><br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Bldg-sim] Wind driven rain data<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Joe<o:p></o:p></p>
<div>
<p class="MsoNormal">Try this link<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><a
href="https://es.scribd.com/document/346851908/MET-Driving-Rain-Index-IRELAND#close_user_settings_menu"
moz-do-not-send="true">https://es.scribd.com/document/346851908/MET-Driving-Rain-Index-IRELAND#close_user_settings_menu</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Regards<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Luis<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Thu 5 Jul 2018, 04:28 Joe Huang,
<<a href="mailto:yjhuang@whiteboxtechnologies.com"
moz-do-not-send="true">yjhuang@whiteboxtechnologies.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC
1.0pt;padding:0cm 0cm 0cm
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<div>
<p>Luis,<o:p></o:p></p>
<p>Thanks for the tip. I went to the link, which by the
way is for the Irish Meteorological Service, and read
that it said, "<span
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#434343;background:white">The
amount of rain received by a wall correlates fairly
well with the product of rainfall and the component of
the wind speed normal to the wall. This led Lacy and
Shellard to propose the product of the mean annual
rainfall and the mean annual wind speed as a driving
rain index which is proportional to the total rainfall
driven in one year on to a vertical surface always
facing the wind", which is functionally quite close
to what I was envisioning, i.e., WDR = LP * f(wspd,
wdir), where LP is Liquid Precipitation or Rainfall.
However, when I clicked on the link to the actual
paper cited, the Meteireann web site responded that
"404: Page not found". Therefore, I still don't know
the function that converts LP or rainfall to WDR.</span><o:p></o:p></p>
<p><span
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#434343;background:white">Joe</span><o:p></o:p></p>
<pre>Joe Huang<o:p></o:p></pre>
<pre>White Box Technologies, Inc.<o:p></o:p></pre>
<pre>346 Rheem Blvd., Suite 205A<o:p></o:p></pre>
<pre>Moraga CA 94556<o:p></o:p></pre>
<pre><a href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank" moz-do-not-send="true">yjhuang@whiteboxtechnologies.com</a><o:p></o:p></pre>
<pre><a href="http://weather.whiteboxtechnologies.com" target="_blank" moz-do-not-send="true">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data<o:p></o:p></pre>
<pre>(o) (925)388-0265<o:p></o:p></pre>
<pre>(c) (510)928-2683<o:p></o:p></pre>
<pre>"building energy simulations at your fingertips"<o:p></o:p></pre>
<div>
<p class="MsoNormal">On 7/4/2018 2:30 PM, Luis Miguel
Blanes Restoy wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal">Hi Roel and Joe<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Did you look at available data
from Met Eireann? There is a paper regarding WDR
index calculation method that may be of your
interest. See below link.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><a
href="https://www.met.ie/climate/what-we-measure/rainfall"
target="_blank" moz-do-not-send="true">https://www.met.ie/climate/what-we-measure/rainfall#</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Regards<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Luis<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<p><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Wed 4 Jul 2018, 22:12
Joe Huang via Bldg-sim, <<a
href="mailto:bldg-sim@lists.onebuilding.org"
target="_blank" moz-do-not-send="true">bldg-sim@lists.onebuilding.org</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid
#CCCCCC 1.0pt;padding:0cm 0cm 0cm
6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<p>What is your definition for Wind-driven
Rain? Practically all weather station
reports, including official stations
available in NOAA's ISD as well as
unofficial "Personal Weather Stations"
hosted on WeatherUnderground, contain
information on liquid precipitation (LP),
wind speed, and wind direction. Can the WDR
be calculated from these standard
parameters, maybe as the LP * f(wspd, wdir)
?<o:p></o:p></p>
<p>Joe<o:p></o:p></p>
<div>
<p class="MsoNormal">On 7/4/2018 3:52 AM,
Roel Tersteeg via Bldg-sim wrote:<o:p></o:p></p>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Dear
all,<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">For
the verification of a model to estimate
wind driven rain (WDR) I would like to
use WDR data from different
microclimates (rural, (sub)urban). I
have access to several data sets of free
field or airfield WDR measurements from
different locations and the results from
a measurement campaign in Vancouver. To
better evaluate the model I would like
to use measured data from one or more
locations with different microclimates,
not being free field or airfield sites.<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">My
question is if someone knows if
measurements are available of wind
driven rain in one or more
microclimates?<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Kind
regards,<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Roel
Tersteeg MSc<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="color:gray">PhD-student
</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="color:gray">Building Energy
Research Group</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="color:gray">School of
Architecture, Building and Civil
Engineering</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="color:gray">Loughborough
University</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="color:gray">T: +44 77 56 10 90
54</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="color:gray">E:
</span><a
href="mailto:R.M.Tersteeg@lboro.ac.uk"
target="_blank" moz-do-not-send="true"><span
style="color:gray">R.M.Tersteeg@lboro.ac.uk</span></a><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
</div>
</blockquote>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
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</blockquote>
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<p class="MsoNormal"><o:p> </o:p></p>
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