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<div class="moz-cite-prefix">On 21/07/18 09:23, Graeme Fitzpatrick
wrote:<br>
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<span
style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">On
21 July 2018 at 04:59, Michael Patrick<span> </span></span><span
dir="ltr"
style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><<a
href="mailto:geodesy99@gmail.com" target="_blank"
style="color:rgb(17,85,204)" moz-do-not-send="true">geodesy99@gmail.com</a>></span><span
style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span> </span>wrote:</span><br
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<ul style="margin-left:40px">
<li>Does light reach the bottom of the deepest point
of the water body?</li>
<li>Does the water body only get small waves (i.e.,
smaller than 1ft/30cm in height)?</li>
<li>Is the water body relatively uniform in
temperature?</li>
</ul>
<p style="margin-left:40px">If these questions can be
answered with a “yes,” the water body is likely a pond
and not a lake.<sup>1</sup></p>
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<div>Other national technical typologies do include a
lower area requirement ranging from .5 hectares ( 'two
NFL football fields' for USA residents ) to 2 hectares,
and other various factors like inflow/outflow, relation
to the water table, sediment suspension, etc.<span> </span></div>
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<div class="gmail_quote">On 21 July 2018 at 05:20, Dave
Swarthout <span dir="ltr"><<a
href="mailto:daveswarthout@gmail.com" target="_blank"
moz-do-not-send="true">daveswarthout@gmail.com</a>></span>
wrote:<br>
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<div>My criteria for deciding between lake and pond are
therefore mostly based on size. Sometimes a lake-sized
water body is obviously very shallow and so I tag it
as a pond. </div>
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<div> </div>
<div>Being an awkward Aussie again :-)</div>
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<div>Lake Eyre, <a
href="https://en.wikipedia.org/wiki/Lake_Eyre"
moz-do-not-send="true">https://en.wikipedia.org/wiki/Lake_Eyre</a>,
when full, has a surface area of "<span
style="font-family:sans-serif;font-size:14px">9,500 km</span><sup
style="line-height:1;font-size:11.2px;font-family:sans-serif">2</sup><span
style="font-family:sans-serif;font-size:14px"> (3,668 sq mi)" </span>but
has only filled a handful of times in the last ~150 years.
Even when full, the maximum water depth in the deepest
spot is only 6 m's, with most being <3 m's, & the
water is virtually transparent, so that the lake bottom
can still be seen from the air.</div>
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<div>So this makes it only a pond? (& a intermittent one
at that! :-)) <br>
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Ephemeral. :)<br>
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