I've been doing micro tweaks using JOSM deliberately choosing rivers that participate in multiple relationships to test if I was downloading them correctly and any edits I do are uploaded correctly.

I have done many more which have not appeared on that "loach" website so my edits are working in general.

Why this one appeared I'm not entirely sure, the only thing I can think of it is that it's a bit on the network that overlapped the download areas or did not overlap and some how it got missed/excluded from the splitting process and the relationship was broken.

Should be fixed now.

I'm showing naivety here, I've never seen this website (http://www.loach.me.uk/osm/boundaries/) before. I was expecting to see my [offending] username all over it as someone who has broken a relationship. I was not able to find myself on it and a lot of the areas appear to be elsewhere in the UK. How does one identify the relationships I broke but may have not been fixed by the revert process? In my total ignorance it seems like there is nothing for me fix, but I guess I'm not using this website correctly?

I believe I have been able to revert my changes that I made today. I want to go away and discuss with others what next step should be. I'm personally for editing OSM so there is one definitive version that everyone can benefit from. Having snapshots with considerable post processing squirrelled away in github or any other site is something I would like to avoid.

I have found a plugin in JOSM that allows me to revert changes, I'm running this in the hope this undoes my edits. Interesting argument SK53, I look at the river data and a see an unusable topological nightmare. I was attempting to improve it so that it can be used by the wider scientific community for hydrological analysis free of licensing issues. OS OpenRivers is not perfect and I wanted to improve OSM. Does the idea of a "post processing chain" not break the ideology of OSM in that you feed back and improve the dataset? If I take a snapshot, improve it then no one else can share the benefits if I don't upload it?

Hello,

I followed your link and if I have understood correctly my attempts to update the river network by breaking it at junctions is loosing the relationship with the parish boundary?

I have stopped my bulk editing and update until I can work out how to resolve this.

It looks like my edits are only affecting the streams that are also tagged as a parish.

If someone added back the parish boundary and left the new junctions as-is then this won't upset what I am doing.