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<div class="moz-cite-prefix">The area I would tag as a
landuse=basin, basin=detention/retension/infiltration. That is
what I have done around me. <br>
Most of these are larger than your example, the largest one that I
know of is <a class="moz-txt-link-freetext" href="https://www.openstreetmap.org/way/282846991">https://www.openstreetmap.org/way/282846991</a>. <br>
<br>
Some sports field are used as a detention pond when high rates of
rain fall cause the drainage system to back up, the over flow is
held by the low lying sports field for later drainage. I have left
these alone - a temporary use that won't often be seen I hope. <br>
<br>
On 20/06/19 00:09, Jez Nicholson wrote:<br>
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<div dir="ltr">My client GeoSmart are experts on SuDS, further
reading at <a
href="https://geosmartinfo.co.uk/knowledge-hub/sustainable-drainage-systems/"
moz-do-not-send="true">https://geosmartinfo.co.uk/knowledge-hub/sustainable-drainage-systems/</a>
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<div>Many/most planning applications for new developments now
have to mitigate the drainage area that has been lost to
houses/drives/roads/etc. It can be difficult to identify a
SuDS installation as they are deliberately blended into the
site. It might just be a pond at the bottom of a larger dipped
area that'll take some of the bite out of a flash flood.</div>
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<div dir="ltr" class="gmail_attr">On Wed, Jun 19, 2019 at 2:46
PM SK53 <<a href="mailto:sk53.osm@gmail.com"
moz-do-not-send="true">sk53.osm@gmail.com</a>> wrote:<br>
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<div>Last night before visiting the pub we had a look at
part of Sheffield's "Grey-to-Green" SuDS system.
Unfortunately all my batteries ad packed up at this point,
but there are some decent pictures on <a
href="https://twitter.com/NigelDunnett/status/1136347921950134273"
target="_blank" moz-do-not-send="true">twitter</a>.<br>
</div>
<div>The bit we looked at was outside the courthouses. It
consisted of :<br>
</div>
<ul>
<li>A bio-swale. Planted with a colourful mixture of
plants most of which I've forgotten now, although I do
recall Jerusalem Sage. The ground was a gravel mix with
presumably a geo-membrane underneath to retain water. A
few birches were also planted along the length of the
swale. Superficially this just looks from a distance
like a large ornamental flower bed.</li>
<li>Concrete 'dams' periodically, along the swale, rising
to within a few inches of pavement level and with a
v-shaped notch in the centre. Obviously these are not
really dams, more a type of weir, being designed to
moderate the flow of water through pooling behind each
dam. I've seen similar constructions in the Alps albeit
on a larger scale. </li>
<li>At the bottom of the swale a more obvious drainage
channel. Where the swale is broken for pedestrian access
this runs in a recessed gutter covered by a grille.</li>
</ul>
<div>There are probably other features of the completed
scheme which we didn't see. I notice many new-build
housing estates will have an area set aside as a water
retention basin.</div>
<div><br>
</div>
<div>I've previously noted a SuDS along <a
href="https://web.archive.org/web/20131002214536/http://www.susdrain.org/case-studies/case_studies/nottingham_green_streets_retrofit_rain_garden_project.html"
target="_blank" moz-do-not-send="true">Ribblesdale Road</a>
in Nottingham, but the features involved are on too small
a scale to consider mapping for now.</div>
<div><br>
</div>
<div>This type of infrastructure is becoming much more
popular, particularly with extreme flooding events due to
surface run-off. I'd hoped to look at the one in
Sheffield, and fortunately Laura both remembered this and
where it was. Larger ones are relatively simple to map the
main features, choosing viable & appropriate tags is
more challenging. I've <a
href="https://www.openstreetmap.org/#map=19/53.38533/-1.46791"
target="_blank" moz-do-not-send="true">had a go</a>, but
am very open to other suggestions. I suspect the whole
swale should be mapped as a waterway feature. For now I've
used waterway=drain with intermittent=yes for the channel
in the swale & the connecting part of the drain
running in a covered gutter (one import in Santa Clara Co,
CA opted for waterway=stream). However many of the
features could use man-made rather than waterway tags. </div>
<div><br>
</div>
<div>In conclusion: there's probably a SuDS near you;
they're hard to tag (for know); but not too hard to map;
we could do with thinking about better tags.</div>
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<div>Regards,</div>
<div><br>
</div>
<div>Jerry</div>
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