On that page it says:
* In the very common case of rivers subject to seasonal flooding with
much higher water levels for a relatively short period for example
during monsoon season or snow melt and low and relatively constant water
levels for the rest of the year it is best not to map the
sent from a phone
Il giorno 26 set 2016, alle ore 00:58, Colin Smale ha
scritto:
>> Problems of defining a boundary exist with river banks too.
> That is rather obvious - the area which is covered by water can be a
> continuum, depending on the conditions at any given moment.
>
yes, that
On 26-Sep-16 06:03 PM, Colin Smale wrote:
On 2016-09-26 09:52, Martin Koppenhoefer wrote:
sent from a phone
Il giorno 26 set 2016, alle ore 02:00, Colin Smale
mailto:colin.sm...@xs4all.nl>> ha scritto:
I don't have my own definition, and I don't want to make up a new
one. A quick search r
On 2016-09-26 09:52, Martin Koppenhoefer wrote:
> sent from a phone
>
> Il giorno 26 set 2016, alle ore 02:00, Colin Smale ha
> scritto:
>
>> I don't have my own definition, and I don't want to make up a new one. A
>> quick search revealed these:
>>
>> * a nearly flat plain along the cours
sent from a phone
> Il giorno 26 set 2016, alle ore 02:00, Colin Smale ha
> scritto:
>
> I don't have my own definition, and I don't want to make up a new one. A
> quick search revealed these:
>
> a nearly flat plain along the course of a stream or river that is naturally
> subject to floo
There was a proposal a while back for a 'water=intermittent' tag, which
might be revised for the situation, perhaps with some additional tagging to
describe whether the area is inundated seasonally or only sporadically.
For the 'official' flood control boundary, there are also
boundary=protected_a
On 2016-09-26 01:18, Warin wrote:
> On 26-Sep-16 08:58 AM, Colin Smale wrote:
>
>> On 2016-09-26 00:17, Warin wrote:
> Perhaps you could state your definition?
> One definition I saw briefly said something about the maximum expected area
> ... I only skimmed it .. looking for a open source map
On 26-Sep-16 08:58 AM, Colin Smale wrote:
On 2016-09-26 00:17, Warin wrote:
On 25-Sep-16 08:48 PM, Colin Smale wrote:
Where would the boundary be? How could we describe it objectively?
In low lying areas such as the Netherlands there are sometimes so
called winter dykes which give a sharp ed
On 2016-09-26 00:17, Warin wrote:
> On 25-Sep-16 08:48 PM, Colin Smale wrote:
>
>> Where would the boundary be? How could we describe it objectively? In low
>> lying areas such as the Netherlands there are sometimes so called winter
>> dykes which give a sharp edge to the flood plain. Otherwis
On 25-Sep-16 08:48 PM, Colin Smale wrote:
Where would the boundary be? How could we describe it objectively? In
low lying areas such as the Netherlands there are sometimes so called
winter dykes which give a sharp edge to the flood plain. Otherwise it
would all be a bit vague around the edges.
sent from a phone
> Il giorno 25 set 2016, alle ore 12:30, Warin <61sundow...@gmail.com> ha
> scritto:
>
> My thinking is that this would lead to conflicts with other 'natural' tags ..
> like natural=scrub than may be applied to the same area.
it's not a real problem, they could overlap. Na
On Sunday 25 September 2016, Warin wrote:
> [...]
>
> So .. what would be the best key to use for this feature/value?
In general the problem about tagging flood risk is verifiability. How
often should an area be subject to flooding to warrant such a tag? In
case of flood events that occur mayb
In the United States, this is usually defined as the "X years
floodplain", indicating how frequently it's expected to flood. For
example, the 100-year floodplain is the area around a river is the area
that's expected to flood an average of once every hundred years.
--
Mark
On Sun, 25 Sep 2016 1
> On Sep 25, 2016, at 3:30 AM, Warin <61sundow...@gmail.com> wrote:
>
> Hi,
>
> There is a draft to tag floodplains using the key natural.
>
>
> http://wiki.openstreetmap.org/wiki/Proposed_features/floodplain
>
>
> My thinking is that this would lead to conflicts with other 'natural' tags ..
Would this be used for controlled areas flooded by a river only during
extraordinary rains (like a super-typhoon)?
Here is a river that has never exceeded the bounds of the "normal" flood
control measures in the time I have lived here, but these parks are clearly in
a contained flood channel t
Where would the boundary be? How could we describe it objectively? In low lying
areas such as the Netherlands there are sometimes so called winter dykes which
give a sharp edge to the flood plain. Otherwise it would all be a bit vague
around the edges.
//colin
On 25 September 2016 12:30:50 CEST
Hi,
There is a draft to tag floodplains using the key natural.
http://wiki.openstreetmap.org/wiki/Proposed_features/floodplain
My thinking is that this would lead to conflicts with other 'natural'
tags .. like natural=scrub than may be applied to the same area.
So .. what would be the bes
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