Boardwalk Stob replacement

[Fredsboy]

Next question: as the passing water then flows on to a fishing lake what is a safe product to treat timber with please to minimise potential toxic leaching 

[Fredsboy]

We went back in this week and checked another section. As the pic shows this is where the excess water in the Carr trickles back into the lower ground and main pond. It looks as though poles were laid at 90% across (actually damming) the trickle (stream after rain) and rotting the entire infrastructure

[Fredsboy]

In a close up we can also see that an earlier walk was built in places without poles, using stobs and stringers butting up to poled sections. so a  real mish mash

[Fredsboy]

I am thinking that we will 'bridge' the run off stream. Is there any mileage, while the walk is up, in shoring the stream with sides (of what) or even a culvert?

[openspaceman]

2 hours ago, Fredsboy said:

I am thinking that we will 'bridge' the run off stream. Is there any mileage, while the walk is up, in shoring the stream with sides (of what) or even a culvert?

For migration of inverts and herps I would say a muddy grip bridged by the decking was best.

Edited July 31, 2021 by openspaceman
typo

[Fredsboy]

Apologies Openspaceman still new to a lot of this, do you have an example "muddy grip bridged by the decking "

Paul

[openspaceman]

1 hour ago, Fredsboy said:

Apologies Openspaceman still new to a lot of this, do you have an example "muddy grip bridged by the decking "

Paul

No you'd need better advice than mine.

 

A grip is just a shallow drain rather than a trench filled with water, shallow sloping sides preferably with enough light getting through for some vegetation to grow as many micro beasties can be put off by having to cross open ground.

 

A couple of sort of examples: down on the New Forest I came across an electrocuted otter, big animal rather than what we are discussing, but I couldn't understand why it had got out of the river walked up the embankment and tried to cross the third rail (600-900V DC). It seems that as the river went under the brick arch with vertical walls each side of the water with no bank the otter would not swim through. Similarly on the heath silver studded blue would not migrate across a 16ft road and it was because both sides were tree-lined, once gaps were created both sides they few across.

 

Roads are one of the worst things for isolating meta populations and very little green bridging is done in this country.

[Fredsboy]

Gotcha.  a lot of the culvert advice seems to assume a road - we are going under a boardwalk, but assuming the same principle, maybe we should include a wee beastie tunnel higher than the water level so they can get under without going in..

Paul

[openspaceman]

1 hour ago, Fredsboy said:

Gotcha.  a lot of the culvert advice seems to assume a road - we are going under a boardwalk, but assuming the same principle, maybe we should include a wee beastie tunnel higher than the water level so they can get under without going in..

Paul

Piped culverts aren't very wildlife friendly which is why I said a shallow grip, if you must pipe it in the pipe should be big enough and deep enough that the bottom fills with silt that won't get flushed out.

[Fredsboy]

analogy I guess is underpass in South London - got me thinking