Pond reinstatement

[stroller]

The Somerset Rivers authority via FWAG are going to pay me to dig out a silted up and overgrown pond, and construct a leaky dam. They’ve suggested a way of making the outlet with twin wall and concrete, has anyone done anything similar?

 

[HatsOff]

Looks the same basic idea as an orifice chamber - which is a flow control chamber with a weir wall with a hole in it. So the hole lets out a trickle flow but in high/floods the weir is overtopped.

 

[flywheel]

Are you liable for flooding etc if this goes pear shape in the future?

 

[stroller]

It's a small pond not a massive reservoir! That's why I think the 600mm chamber is overkill, currently the ditch goes into a 9" pipe, so not huge flows of water, total area of pond won't be more than 75 sq/m, not worked out the levels yet but the deepest would only be 4ft max.

 

[Doing it for the kids]

Out of curiosity will the area round the pond ever flood?

 

[FMF74]

I’m sure that’s called a monk around here not sure why.

 

[Doing it for the kids]

I’m sure that’s called a monk around here not sure why.

Google their haircut - tonsure

 

[stroller]

Out of curiosity will the area round the pond ever flood?

doubtful as the fields around it drain to the pond which is the lowest point, it then goes in a ditch that continues through my fields, so not worried about flooding.

 

[tullah]

What’s the going rate from Natural England for cleaning out a silted up pond? I’ve got three in mind here.

 

[som farmer]

we have an old mill pond, silted up a few 100 yrs ago, always been a bugger to drain.

however, some in a scheduled monument field, some not, the not bit, l put into a pond yrs ago.

so thought would do the other, it just holds wet.

ring up EH, out they come, wonderful idea. Then :-

pay for a full archaeological survey, of the area, would take someone 2 days.

then pay an archaeologist to be there, when we dug it out, because you never know what someone might have thrown in the pond, l was thinking kittens in a bag, not sure what they were thinking off !

so, can l dig up the drains to get them running again ? yes.

can l 'redig' the ditch that 'sometimes' ran through it ? yes, but wouldn't it look nice as a pond again.

yes, it would, but at that expense, not a chance, dug the ditch, wet patch dried up.

what l didn't tell them, there was no medieval village there, as they thought, because a big survey had been done, and no village there, there was elsewhere though ......................

 

[Doing it for the kids]

doubtful as the fields around it drain to the pond which is the lowest point, it then goes in a ditch that continues through my fields, so not worried about flooding.

Thanks.

The only reason I asked is because we have been forced to build a holding pond in relation to some solar to prevent the wicked flooding caused by it.

They initially suggested building it half way up the hill near no ditches.

When I pointed this out they then suggested at the lowest point. I explained that all that would happen is the pond would fill in October and drain in march so not help at all with flow spikes.

Fell on deaf ears, they knew best of course.

 

[deleted user 837354]

Is a pond of 4ft in depth even worth it? Me having no understanding of such things would think deeper=betterer? That leaky outlet- be ideal for filling the sprayer, no?

 

[Exfarmer]

Thanks.

The only reason I asked is because we have been forced to build a holding pond in relation to some solar to prevent the wicked flooding caused by it.

They initially suggested building it half way up the hill near no ditches.

When I pointed this out they then suggested at the lowest point. I explained that all that would happen is the pond would fill in October and drain in march so not help at all with flow spikes.

Fell on deaf ears, they knew best of course.

It will help with flow spikes if you have a relatively small drain possibly a third below the top so the pond will drain slowly after rainnand hoefully keep some water al, year

 

[Doing it for the kids]

It will help with flow spikes if you have a relatively small drain possibly a third below the top so the pond will drain slowly after rainnand hoefully keep some water al, year

Water table is a few inches down so will naturally fill up.

Had it been half way uphill intercepting main ditch with a hydro bake then different chat!

 

[Grass And Grain]

What holds that vertical piece of twinwall in place?

Edit. Just set in concrete at its base?

Will the twinwall stand the sunlight?

Better with a concrete pipe, with slit cut in side with angle grinder?

 

[puppet]

We made a pond/wetland without any concrete or leaky containers. Attached a vertical pipe to the outfall pipe using a right angle joint and anchored in a sump of stones. Water spills over the top to maintain level. Materials cost nothing, just had to dig to find the drain. Would be easy to make a few holes lower down to act as an attenuation pipe and lower the water level until it rains. However 75m2 is going to fill pretty quickly in heavy rain.

Is a pond of 4ft in depth even worth it? Me having no understanding of such things would think deeper=betterer? That leaky outlet- be ideal for filling the sprayer, no?

If you are just doing it for nature can be quite shallow to allow waders or ducks to feed below with a small deeper area to prevent winter freezing. Gentle slowing banks to allow them to climb out.