I have tried the following in order to obtain all the pools of which length is > 10 meters.
This has been generated by the overpass-turbo wizard.
The original search was:
// gather results
// query part for: ““swimming pool””
// print results
out skel qt;
Out of maybe 500 existing pools known by OSM within the bbox, it highlights only 1, so something is wrong. I guess people do not enter length when creating a pool object.
If you want this type of information, I’d suggest requesting people consider adding it at the talk-gb mailing list. It’s usually known locally, so fellow contributors may be able to improve this aspect of the data quickly.