[OSM-newbies] Weirs

[Andrew Errington]

Hi,

I have a river with weirs.  I have marked each end of the weir and drawn a
way between them.  This is is waterway=weir.  To make the river I have
drawn the river banks (waterway=riverbank, natural=water), and along the
centre of the river I have drawn a way to indicate the river itself
(waterway=river).  This is consistent with the instructions[1].

Rendering is not quite right,  The weir is drawn on top of the water,
which is a blue area between the riverbanks.  The river is drawn as a blue
line, which cannot be seen against the water between the riverbanks,  but
it is drawn on top of the weirs, so they have a blue gap in the line.

I expect if I set 'layer=1' for the weir it might work, but I don't think
that's the Right Thing to do.  Am I missing something, or shall I create a
bug report for Mapnik?

Andrew

[1] http://wiki.openstreetmap.org/wiki/Tag:waterway%3Driverbank