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  #1   IP: 86.174.123.80
Old 30-10-2017, 10:14 PM
Kevindb880 Kevindb880 is offline
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Default Open Ditch or French drain?

We have a farm track which during heavy rain water washes two ways down it meeting in a valley, it then washes over a bank and flows down a valley gouging a channel sometimes upto 2 feet deep which not only washes the crop out of the ground but also tons of soil which ends up in the bottom of the valley.
The bank it washes over is about 50ft long, the water doesnít just go over in one point but over a distance of about 30ft.
We want to catch the water before it gouges out the valley. There is 6in pipe going down the valley about 3ft deep that we want to divert the water into.
My question is would we be better having an open ditch or a French drain bottom side of the the bank to catch the water and divert it into the pipe?
Itís only a rough farm track so it would be difficult to build up the edge so that the water would go over the bank in one place.
It is only water going over the bank so it wouldnít fill either a ditch or French drain with dirt!
Kevin
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  #2   IP: 86.168.16.226
Old 30-10-2017, 10:38 PM
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Default Re: Open Ditch or French drain?

Quote:
Originally Posted by Kevindb880 View Post
We have a farm track which during heavy rain water washes two ways down it meeting in a valley, it then washes over a bank and flows down a valley gouging a channel sometimes upto 2 feet deep which not only washes the crop out of the ground but also tons of soil which ends up in the bottom of the valley.
The bank it washes over is about 50ft long, the water doesnít just go over in one point but over a distance of about 30ft.
We want to catch the water before it gouges out the valley. There is 6in pipe going down the valley about 3ft deep that we want to divert the water into.
My question is would we be better having an open ditch or a French drain bottom side of the the bank to catch the water and divert it into the pipe?
Itís only a rough farm track so it would be difficult to build up the edge so that the water would go over the bank in one place.
It is only water going over the bank so it wouldnít fill either a ditch or French drain with dirt!
Kevin
sounds like a hell of a lot of water to be trying to direct into a 6" pipe Kev
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  #3   IP: 86.174.123.80
Old 31-10-2017, 07:17 AM
Kevindb880 Kevindb880 is offline
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Default Re: Open Ditch or French drain?

Um Thatís what I reckon but the pipe is there and if we can get some of the water down it it will help!
The water off the track never used to be a problem but the way it rains these days it can happen every winter.
For some strange reason there are also 3 land drains that run in a ditch beside the track, this ditch is quite long and under normal rainfall itís not a problem but this can also overflow onto the track.
This only used to happen once in ten years now it can be every winter if itís a wet one, I think the weather is definitely changing and not for the better!
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Old 31-10-2017, 09:46 AM
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Default Re: Open Ditch or French drain?

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Originally Posted by Kevindb880 View Post
Um Thatís what I reckon but the pipe is there and if we can get some of the water down it it will help!
The water off the track never used to be a problem but the way it rains these days it can happen every winter.
For some strange reason there are also 3 land drains that run in a ditch beside the track, this ditch is quite long and under normal rainfall itís not a problem but this can also overflow onto the track.
This only used to happen once in ten years now it can be every winter if itís a wet one, I think the weather is definitely changing and not for the better!
no question Kevin ... the deluges are more frequent and heavier than of years gone by. Can get an unbelievable volume of water in a matter of minutes these days.

Think I'd be going with a stone filled land drain, as big as poss., TBH .. it attenuates the flow and slows the speed of it dramatically .... your pipe may stand a chance then perhaps.
Plus if it's full of stone, it's not an open ditch to lose a wheel into, on a dark foul night
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Old 31-10-2017, 05:13 PM
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OllieGunns OllieGunns is offline
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Default Re: Open Ditch or French drain?

On steep fire roads in the Alps which get frequent heavy rainfall in the summer, they dig small 4" wide channels that run diagonally across the track down the hill to a ditch at the side. They line the channels with timber either side and make good the track up to that. Vehicles can drive straight over them no worries and the water gets caught before it all joins into a raging torrent - which is what it sounds like you have!

If its excessive run off water you are trying to catch then I would suggest a ditch would be better, even if filled with shingle to the top if you are worried about animals getting stuck in it. This combined with the run off channels on the track should make your track last longer and solve your crop washing away.
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Old 31-10-2017, 11:38 PM
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Default Re: Open Ditch or French drain?

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Originally Posted by OllieGunns View Post
On steep fire roads in the Alps which get frequent heavy rainfall in the summer, they dig small 4" wide channels that run diagonally across the track down the hill to a ditch at the side. They line the channels with timber either side and make good the track up to that. Vehicles can drive straight over them no worries and the water gets caught before it all joins into a raging torrent - which is what it sounds like you have!

If its excessive run off water you are trying to catch then I would suggest a ditch would be better, even if filled with shingle to the top if you are worried about animals getting stuck in it. This combined with the run off channels on the track should make your track last longer and solve your crop washing away.
My terminology may have been off ..... that's basically what I meant with 'land drain' ... large ditch full of clean stone (without a pipe at the bottom, in this case) allows flow, but slows it dramatically
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Old 01-11-2017, 12:59 AM
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Default Re: Open Ditch or French drain?

Cut a V ditch deeper than required, fill with a good 6" of Clean stone (40mm - 75mm) put a section of 6" land Drain pipe in and then top off with the same clean stone.

Best of both worlds then. The large attenuation capacity and catchment of a V Ditch and the safety of not having a ditch, likewise no maintence other than scraping the top off every few years to keep the grass from blocking it.
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  #8   IP: 86.174.123.80
Old 01-11-2017, 01:03 PM
Kevindb880 Kevindb880 is offline
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Default Re: Open Ditch or French drain?

Here is what has happened in the past and you can see why we want to stop it happening again!
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  #9   IP: 82.20.150.176
Old 07-11-2017, 08:10 PM
strott strott is offline
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Default Re: Open Ditch or French drain?

That's some erosion
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  #10   IP: 86.174.123.80
Old 08-11-2017, 08:27 PM
Kevindb880 Kevindb880 is offline
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Default Re: Open Ditch or French drain?

Was quite bad that year, had a couple of days with jcb and tractor and trailer loading the dirt up in the valley and taking back up the hill to fill the rut up.
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