[Talk-GB] Sewage Outfalls

[Warin]

On 28/10/21 11:27 pm, James Derrick wrote:
> Hi,
>
> On 27/10/2021 09:12, SK53 wrote:
>> As sewage outfalls are in the news at present it might be a good 
>> opportunity to map some of them, particularly those close to popular 
>> bathing beaches.
>
> In case anyone is mapping sea outfalls, you can usefully represent 
> both the physical discharge pipe and the "nautical signage" often 
> placed around it.
>
> After regulations were tightened to enforce secondary treatment, many 
> outfalls were rebuilt with long underwater pipes to discharge treated 
> water into the main current of the sea. After many years of sailing 
> dinghies in Newbiggin Bay, only disused outfalls are visible even at 
> mean low water springs (MLWS on maps - lowest of the low tides). The 
> active discharge pipe is buried deep into rock, and then sand. The 
> only ground-truth for 1.5km is a yellow buoy to discourage boat anchors.


I would have though all sewage would now be a fair way out to sea, not 
near a tidal area.

The outfall I see around me is storm water. The only time I see/smell 
sewage is when there is a fault.


Grey water? In domestic and industrial areas this is mixed with sewage, 
cheaper to run one pipe that 2 and it helps clear the fat burgs.

Grey water is used in RVs to help keep water use low.

>
> In case you're not a sailor, OpenSeaMap is a render of OSM that 
> produces sea charts and tagging structures such as buoys, markers, and 
> lights using international standards for sea marks (road signs for 
> boats!)
>
> https://map.openseamap.org/
>
> My own local outfall marker buoy is therefore tagged using the seamark 
> tag which is rendered fully only on OpenSeaMap:
>
> https://www.openstreetmap.org/node/4338899837/
>
> You might also find other 'signs' or 'marks' on the foreshore warning 
> boats of the outfall such as fixed poles with shapes on the top - a 
> yellow X is one option, but there are a few possibilities. The marks 
> should be standard, but as ever there are many standards - offshore 
> IHO and inshore CEVNI to name but two.
>
> There are also plug-ins for JOSM to make mapping sea marks easier, and 
> add some validation
>
> Happy Mapping,
>
>
> James
>
> James