Yard gulley

[bitwrx]

We're going to have party of our yard relaid, as it's broken up (prematurely). Part off the problem has been poor drainage. There's always been standing water on it.

So what we need is a gulley to drain the water away. We've been told that a suitable fall for the gulley is 1 in 240 (inch in 20').

If that's the case, the gulley bottom needs to be 80 mm below the current yard level at its discharge, and for various reasons we need to take it straight through some good concrete that wouldn't otherwise be re-laid. We're trying to minimise the amount of good concrete we need to cut out.

How steep can we make the slope into and out of the gulley so it's comfortable to drive across with the handler?

We've had a look at some slopes around the yard, and for the moment, have settled on a 1 in 10 slope. This means we need to cut out 1800mm width of concrete at the end (800mm lead in, 200mm gulley bottom, 800 lead out).

Does anyone have experience of anything similar? If so, how did you get on?

Thanks in advance.

 

[teslacoils]

We've been told that a suitable fall for the gulley is 1 in 240 (inch in 20').

Who told you that?

 

[Mouser]

We're going to have party of our yard relaid, as it's broken up (prematurely). Part off the problem has been poor drainage. There's always been standing water on it.

So what we need is a gulley to drain the water away. We've been told that a suitable fall for the gulley is 1 in 240 (inch in 20').

If that's the case, the gulley bottom needs to be 80 mm below the current yard level at its discharge, and for various reasons we need to take it straight through some good concrete that wouldn't otherwise be re-laid. We're trying to minimise the amount of good concrete we need to cut out.

How steep can we make the slope into and out of the gulley so it's comfortable to drive across with the handler?

We've had a look at some slopes around the yard, and for the moment, have settled on a 1 in 10 slope. This means we need to cut out 1800mm width of concrete at the end (800mm lead in, 200mm gulley bottom, 800 lead out).

Does anyone have experience of anything similar? If so, how did you get on?

Thanks in advance.

You going to slope 3ft each side into a 3inch gulley?
Seems extreme. What length of gulley? What equivalent pipe size would it be to take water? Could you take half into a drain and pipe it away so a smaller dish in concrete would take the rest?

 

[bitwrx]

Who told you that?

Builder. What's your view?

 

[bitwrx]

You going to slope 3ft each side into a 3inch gulley?
Seems extreme. What length of gulley? What equivalent pipe size would it be to take water? Could you take half into a drain and pipe it away so a smaller dish in concrete would take the rest?

Gulley is about 28m long. With a fall of 1 in 240, we're looking at a total fall of 115-120mm over its length. The way the levels work out, the gulley would be 80-90 mm below the current concrete at one end. Zero at the other end.

Unfortunately drains have been discounted. It's the yard in front of our weaner shed. Two bays get mucked out every week, and one of them gets pressure washed. 8 odd trailer loads of dung, approx 2 to 3 cubic m of pressure wash water and a good few hundred kilos of shîte as a result, so anything under a grating is likely to get bunged up. We generally scrape the yard after pressure washing to keep it clean-ish, but it does spend most of the winter covered on mud brought in from the pig fields.

Worth noting that we'll be driving across the gulley for every bucket/grab load of dung. And every bale of bedding. And a fair few other times for various purposes. I really don't want it to be uncomfortable.

 

[teslacoils]

Builder. What's your view?

I haven't got one. I'm planning yard and roof drains and it's a case of ask three people get four answers. Hence I was probing you four your source

 

[bitwrx]

I haven't got one. I'm planning yard and roof drains and it's a case of ask three people get four answers. Hence I was probing you four your source

When you find your other three answers, let me know what they are. I could do with some... context. Not that I don't trust the builder. Just want an independent sense-check somehow.

 

[teslacoils]

When you find your other three answers, let me know what they are. I could do with some... context. Not that I don't trust the builder. Just want an independent sense-check somehow.

Me too. When you're putting stuff underground for 100 years you don't want to be doing much to it after day 1.

 

[bitwrx]

Me too. When you're putting stuff underground for 100 years you don't want to be doing much to it after day 1.

1000000%

 

[teslacoils]

Replies so far, this is for pipes and drains:

1:100 surface water
1:80 surface water
Depends on diameter of pipe.

 

[bitwrx]

Replies so far, this is for pipes and drains:

1:100 surface water
1:80 surface water
Depends on diameter of pipe.

I've heard 1:120 for pipe. ?‍

Surely there's a farmers' book for this sort of stuff?

 

[teslacoils]

For flow exceeding 1litre per second:

4" pipe is 1:80 min
6" pipe is 1:120 min.

Nhbc regs.

Field drains iirc no greater than 1:200.

 

[24/7 farming]

If the water going down the pipe is going to be dirty (from muck in yard etc) a fall that shallow might not be enough to carry the dirt to the outfall and will end up silting up the pipe over time. If stuck wit them levels and falls make sure there is a silt trap in the gully to catch most of the dirt (will need shovelled out every so often). We had to lay a pipe level to get water away in part of our yard, have to clean the box 2-3 times a year but never no issue wit the pipe staying clean

 

[bitwrx]

If the water going down the pipe is going to be dirty (from muck in yard etc) a fall that shallow might not be enough to carry the dirt to the outfall and will end up silting up the pipe over time. If stuck wit them levels and falls make sure there is a silt trap in the gully to catch most of the dirt (will need shovelled out every so often). We had to lay a pipe level to get water away in part of our yard, have to clean the box 2-3 times a year but never no issue wit the pipe staying clean

Great advice. Many thanks. Our gulley is going to flow towards a silt trap of sorts, so we will be able to keep any downstream pipes clear of debris.

 

[Mur Huwcun]

If you’re going to muck about with traps and pipes can’t you slope the gulley to the middle of yard and pioe it away, you will then only need to half the drop in level?

 

[Robert K]

@RWG Contracts will be along

 

[bert]

Something like this any good? Was thinking of doing this running to a grate in the middle of the yard

 

[deleted user 837354]

If the water going down the pipe is going to be dirty (from muck in yard etc) a fall that shallow might not be enough to carry the dirt to the outfall and will end up silting up the pipe over time. If stuck wit them levels and falls make sure there is a silt trap in the gully to catch most of the dirt (will need shovelled out every so often). We had to lay a pipe level to get water away in part of our yard, have to clean the box 2-3 times a year but never no issue wit the pipe staying clean

Agreed, need a trap for the gunge that you can get in and clear out with a shovel when it's full.

 

[Forever Fendt]

i150X90 steel channel galvanised with fishtails welded to it and set on a good concrete bed and slab each Side tied into it at your crossing points use a piece of 127x63 channel sat in the opposite way round with some stops welded inside to stop it moving

 

[chaffcutter]

Interesting thread, but some plans/drawings would help!