[talk-au] Brisbane Flooding on NearMap

[Elizabeth Dodd]

On Sat, 15 Jan 2011 07:57:49 +0100
"waldo000000 at gmail.com" <waldo000000 at gmail.com> wrote:

> On Sat, Jan 15, 2011 at 6:02 AM, Elizabeth Dodd <edodd at billiau.net>
> wrote:
> >
> > > > flood_prone=yes
> > >
> > > Need to expand it a little to cover how often that level is
> > > likely to occur etc and/or height above the normal river level.
> >
> > Jan 2010 added to it somehow would be adequate?
> 
> I think it would be better to describe the flood by a height, rather
> than by a date. This way, it is generalisable to future floods.
> 
> Something like:
> flood_prone=yes
> flood_prone:height=*
> 
> Obviously, we'd need to carefully define "height" (is it normally with
> respect to some marker, or with respect to sea level, etc.?) Anyway,
> the idea is that this field would describe under what conditions the
> area (or way) is flood prone.

flood markers exist at particular points but are subject to being moved
you can find references on bom.gov.au to some river heights not being
at the same point as the historical flood marker
so you can say that this is Xmetres on the Brisbane City Gauge
flood_prone:height=* sounds good but we don't have that much data - we
can mark the edge as being inundated at X+4.3metres but we don't have
enough data to know where the edge is at X+2 metres (etc)
there are generalised standards avail off BOM where floods are
major:moderate:minor
and those terms are defined here
http://www.bom.gov.au/hydro/flood/flooding.shtml#definitions_terminology

so i suggest we make an effort to fit in with that established
terminology