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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:windowtext'>That seems to be what I settled on too, e.g. <a href="http://www.openstreetmap.org/way/189511931">http://www.openstreetmap.org/way/189511931</a><o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Ed<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='color:windowtext;mso-fareast-language:EN-GB'>From:</span></b><span lang=EN-US style='color:windowtext;mso-fareast-language:EN-GB'> Chris Hill [mailto:osm@raggedred.net] <br><b>Sent:</b> 07 May 2017 17:35<br><b>To:</b> talk-gb@openstreetmap.org<br><b>Subject:</b> Re: [Talk-GB] Mapping Attenuation Ponds / Sustainable Drainage schemes<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p>[not cross posted]<span style='font-size:12.0pt;mso-fareast-language:EN-GB'><o:p></o:p></span></p><p>I have mapped some largish attenuation ponds as landuse=basin, basin=detention here <a href="http://www.openstreetmap.org/#map=16/53.7810/-0.4483">http://www.openstreetmap.org/#map=16/53.7810/-0.4483</a><o:p></o:p></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.<o:p></o:p></p><pre>-- <o:p></o:p></pre><pre>cheers<o:p></o:p></pre><pre>Chris Hill (chillly)<o:p></o:p></pre><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On 07/05/2017 17:22, Steve Brook wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><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><ul style='margin-top:0cm' type=disc><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo2'>Low or normal water level of pond<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo2'>High water level or top of embankment<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo2'>Land use/vegetation between low/high water marks is water tolerant/marsh plants<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo2'>Structures for water input and output – often brickwork and filter screens round a pipe.<o:p></o:p></li></ul><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><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:EN-GB'><br><br><br><o:p></o:p></span></p><pre>_______________________________________________<o:p></o:p></pre><pre>Talk-GB mailing list<o:p></o:p></pre><pre><a href="mailto:Talk-GB@openstreetmap.org">Talk-GB@openstreetmap.org</a><o:p></o:p></pre><pre><a href="https://lists.openstreetmap.org/listinfo/talk-gb">https://lists.openstreetmap.org/listinfo/talk-gb</a><o:p></o:p></pre></blockquote><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:EN-GB'><br><br><o:p></o:p></span></p><pre><o:p> </o:p></pre></div></div></body></html>