On 03/04/18 23:22, Martin Koppenhoefer wrote:
sent from a phone
On 2. Apr 2018, at 23:40, Graeme Fitzpatrick <[email protected]
<mailto:[email protected]>> wrote:
Should it continue more or less straight, following the line of the
beach, across the mouth of the estuary; or should it follow the
estuary / river bank for an undetermined distance inland?
the coastline should represent the limit of the sea, in case of a
river flowing in, people look at the level of salt in the water and
whether the level of the river is influenced by tides (afaik), for
example here you can see a coastline at a “river”:
https://www.openstreetmap.org/way/88960837#map=9/53.6926/9.3947
River flows can be extremely different from one season to the next in
some parts of the world.
Consider the tropics where the major seasons are described as 'wet' and
'dry', river levels can change by 5 meters between the seasons.
In other places the tide can influence river levels for many kilometres
inland.
In both those cases the salt levels will vary from one extreme to another.
Possibly best to take the minimum intrusion of the sea into the river?
Maybe not for some though - the rate of flow will have fresh water going
out into what most would call the sea!
Where this detail is unknown then Graeme's approach of a straight line
across the mouth of the river can be used to minimise work and signify
the lack of information or the conflict for the area.
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