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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"
      type="cite">
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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>
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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]-->Low or normal water
          level of pond<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
                style="font:7.0pt "Times New Roman"">        
              </span></span></span><!--[endif]-->High water level or top
          of embankment<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
                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>
        <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
                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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      <pre wrap="">_______________________________________________
Talk-GB mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Talk-GB@openstreetmap.org">Talk-GB@openstreetmap.org</a>
<a class="moz-txt-link-freetext" href="https://lists.openstreetmap.org/listinfo/talk-gb">https://lists.openstreetmap.org/listinfo/talk-gb</a>
</pre>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">
</pre>
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