[Talk-GB] SuDS (Sustainable Urban Drainage Systems)

[Warin]

The area I would tag as a landuse=basin, 
basin=detention/retension/infiltration. That is what I have done around me.
Most of these are larger than your example, the largest one that I know 
of is https://www.openstreetmap.org/way/282846991.

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.

On 20/06/19 00:09, Jez Nicholson wrote:
> My client GeoSmart are experts on SuDS, further reading at 
> https://geosmartinfo.co.uk/knowledge-hub/sustainable-drainage-systems/
>
> 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.
>
>
>
> On Wed, Jun 19, 2019 at 2:46 PM SK53 <sk53.osm at gmail.com 
> <mailto:sk53.osm at gmail.com>> wrote:
>
>     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 twitter
>     <https://twitter.com/NigelDunnett/status/1136347921950134273>.
>     The bit we looked at was outside the courthouses. It consisted of :
>
>       * 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.
>       * 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.
>       * 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.
>
>     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.
>
>     I've previously noted a SuDS along Ribblesdale Road
>     <https://web.archive.org/web/20131002214536/http://www.susdrain.org/case-studies/case_studies/nottingham_green_streets_retrofit_rain_garden_project.html>
>     in Nottingham, but the features involved are on too small a scale
>     to consider mapping for now.
>
>     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 had a go
>     <https://www.openstreetmap.org/#map=19/53.38533/-1.46791>, 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.
>
>     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.
>
>     Regards,
>
>     Jerry
>
>
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