rivers flowing throu lakes and canals

[cantece]

Hello, I love this page. It is graphically beautiful and scientifically interesting.
I have only two remarks:
1: if a natural waterway runs throu a lake (but is not connected) , is it possible to show all the branches as connected waterways?
2: if a natural waterway runs throu a canal and then back into an other river (all connected in a river relation), is it possible to show all the branches as connected waterways in the downhill mode?

[amandasaurus]

1: if a natural waterway runs throu a lake (but is not connected) , is it possible to show all the branches as connected waterways?

Currently, the only way to do this is map a waterway _though_ the water body. There is currently no other way to do it. The OSM community is a little uncertain if this is always a good idea. Here's a community discussion about it: <https://community.openstreetmap.org/t/should-river-lines-be-mapped-through-lakes-estuaries-gulfs-and-other-large-water-bodies/104438> I did try to add a map view which would include the edges of waterbodies <https://community.openstreetmap.org/t/osm-river-basins-website-to-show-how-are-rivers-in-osm-connected/102655/118> but that didn't work as well, because it only uses `ways` not `relations`, so many water bodies weren't included. However, the latest new feature, the River Directory <https://waterwaymap.org/river/>, could benefit from relation support. So I might add that. cf. <https://community.openstreetmap.org/t/waterwaymap-org-is-not-a-map/127608#:~:text=like%20the%20rest%20of%20wwm%2C%20osm%20waterway%20relations%20are%20completely%20ignored.%20however%2C%20they%E2%80%99re%20probably%20the%20solution%20to%20%E2%80%9Criver%20name%20changes%E2%80%9D%2C%20so%20watch%20this%20space>. BTW I've added this to the (new) [FAQ](https://github.com/amandasaurus/waterwaymap.org?tab=readme-ov-file#if-a-natural-waterway-runs-through-a-lake-is-it-possible-to-show-all-the-branches-as-connected-waterways)

2: if a natural waterway runs throu a canal and then back into an other river (all connected in a river relation), is it possible to show all the branches as connected waterways in the downhill mode?

Alas, the river relation is ignored (for now). In the `flowing_water.tagfilterfunc` file <https://github.com/amandasaurus/waterwaymap.org/blob/main/flowing_water.tagfilterfunc>, you can see the tag rules for what combinations are, and are not, included. There are cases where a canal is included, (cf. <https://community.openstreetmap.org/t/the-end-of-waterway-map/108632/4> ). I think I will have to support river relations, and this might solve all these issues.

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-- Amanda