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<p>[not cross posted]</p>
<p>I have mapped some largish attenuation ponds as landuse=basin,
basin=detention here
<a class="moz-txt-link-freetext" href="http://www.openstreetmap.org/#map=16/53.7810/-0.4483">http://www.openstreetmap.org/#map=16/53.7810/-0.4483</a></p>
<p>These are specifically described by the council, who commissioned
them, as flood alleviation. These are supposed to work by quickly
filling during heavy rainfall and slowly emptying into the
conventional drainage through a restricted outfall thus spreading
out the rainfall and preventing flooding.<br>
</p>
<pre class="moz-signature" cols="72">--
cheers
Chris Hill (chillly)</pre>
<br>
<div class="moz-cite-prefix">On 07/05/2017 17:22, Steve Brook wrote:<br>
</div>
<blockquote cite="mid:000f01d2c74e$1eb23e20$5c16ba60$@tiscali.co.uk"
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<p class="MsoNormal">Many new UK housing estates are required to
be built with Attenuation Ponds / Sustainable Drainage schemes
as part of their development. These are to control rain water
runoff during storms and consist of a pond surrounded by an
embankment with a controlled release structure to slow down
drainage of the water to the river system. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The relevant features might be<o:p></o:p></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-family:Symbol"><span style="mso-list:Ignore">·<span
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</span></span></span><!--[endif]-->Low or normal water
level of pond<o:p></o:p></p>
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style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-family:Symbol"><span style="mso-list:Ignore">·<span
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</span></span></span><!--[endif]-->High water level or top
of embankment<o:p></o:p></p>
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style="font-family:Symbol"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]-->Land use/vegetation
between low/high water marks is water tolerant/marsh plants<o:p></o:p></p>
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style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-family:Symbol"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]-->Structures for water
input and output – often brickwork and filter screens round a
pipe.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Has anyone any experience of mapping and
tagging such a structure? <o:p></o:p></p>
<p class="MsoNormal">Are there any examples of where this has
been done?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Steve<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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