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<DIV><SPAN class=000351401-16022011><FONT face=Arial color=#0000ff size=2>I
think you are making a bit of mountain out of a mole-hill here. For the land
run-off, you can calculate and cheat sheet all you like and still get no better
result than an intelligent guess by looking out the window and making some local
inquiry. You make no mention of terrain, geology, soil conditions, or the
species, size, health and quantity of your trees, if any - and all these
variables are players. You may find that all you need to do to fix thsi
problem, if you actually have one, is to run an absorbtion pipe across the
uphill area that discharges into the existing SWQ dispersal.</FONT></SPAN></DIV>
<DIV><SPAN class=000351401-16022011><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=000351401-16022011><FONT face=Arial color=#0000ff size=2>For
the roof, a more realistic assessment of your daily rainfall might be in
order but, before you worry about that, the best place to start is the annual
collection. For this, all you need is the plan area of the roof, i.e. its
footprint, and the local annual precipitation. That gives you a
starting point and it is then up to you to determine your needs, the desires,
and what you are prepared to invest to achieve that.</FONT></SPAN></DIV>
<DIV><SPAN class=000351401-16022011><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=000351401-16022011><FONT face=Arial color=#0000ff size=2>One
thing you can be pretty sure of is that, if you are not harvesting rainwater
now, your water usage when you do is not likely to be what it is now, thus
further adding to the nebulosity of this exercise.</FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV><FONT face=Arial
color=#0000ff size=2></FONT><BR>
<P><FONT size=2>Nick Pyner<BR><BR>Dee Why NSW </FONT></P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
greenbuilding-bounces@lists.bioenergylists.org
[mailto:greenbuilding-bounces@lists.bioenergylists.org]<B>On Behalf Of
</B>Erin Rasmussen<BR><B>Sent:</B> Wednesday, 16 February 2011 11:57
AM<BR><B>To:</B> 'Green Building'<BR><B>Subject:</B> [Greenbuilding] quick
tools for calculating rainwater run-off?<BR><BR></FONT></DIV>
<DIV class=WordSection1>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 12pt">I live in a low spot, and
we've got rainy conditions for 2/3 of the year. Does anyone have any good
cheat sheets for figuring out how much rain water (in gallons) are coming off
my roof, lawn and land? I've got to install some type of additional drainage
system and i'd like to add rainwater catchment - but I'm not sure what scale I
should be looking at.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 12pt">Total roof area is about 1000
square feet (including the garage) and it's about 0.15 acre but I should
calculate for 0.25 acre to include run-off from the neighbors. Daily
rainfall is typically 0.5-1 inch but it's not unusual to have 3-4 inches in a
2 day period. <o:p></o:p></SPAN></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Erin Rasmussen<o:p></o:p></P>
<P class=MsoNormal>TR Miles Techical Consultants Inc.<o:p></o:p></P>
<P class=MsoNormal>and BioEnergy Discussion Lists<o:p></o:p></P>
<P class=MsoNormal>erin@trmiles.com<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV></BLOCKQUOTE></BODY></HTML>