Old drain keeps flooding Yard in deluges

[Fat hen]

Want to block/stop a drain from flooding car park.

We dug out an area from a woodland for a car park. The ground level of the car park is 5ft below the woodland GL. Halfway up the created perimeter bank we came across a some Georgian drains which drain a sandy soiled woodland. They spill out of the bank onto the car park.
When we get a deluge this causes inundation and washes away our sloped drive.

Any suggestions to stop them from flowing?
Dig it up say 5metres into the woodland and remove some pipes?

 

[David1968]

Dig it up say 5metres into the woodland and remove some pipes?

That will likely bring the bank down into your car park, if there's as much water as you say.

You need to intercept them just before the car park and pipe the water away somewhere else. Where did they flow to before you dug out the car park?

 

[ollie989898]

Dig trench in or around the car park perimeter, put new drainage pipe into it and pipe the drains into it to get the water away another route?

 

[Zebbedee]

You will not stop the water,,,,it always flows to lower ground??? gotta tie a new drain or ditch to the outlets and reroute it, be glad the drains are there and working

 

[yoki]

 

[Sharpy]

Want to block/stop a drain from flooding car park.

We dug out an area from a woodland for a car park. The ground level of the car park is 5ft below the woodland GL. Halfway up the created perimeter bank we came across a some Georgian drains which drain a sandy soiled woodland. They spill out of the bank onto the car park.
When we get a deluge this causes inundation and washes away our sloped drive.

Any suggestions to stop them from flowing?
Dig it up say 5metres into the woodland and remove some pipes?

When you created the car park you should have either dug the drains back and diverted them into a new drain to divert the water or dug new pipes under the car park following the original pipes route but deeper tieing in to the original pipes at both ends. Remember that any attempt to make water run uphill will result in sediment choked pipes. As above choking the ends of the exposed pipes will probably be a disaster, when very wet sands can turn to soup and will act like a fluid.

 

[Fat hen]

That will likely bring the bank down into your car park, if there's as much water as you say.

You need to intercept them just before the car park and pipe the water away somewhere else. Where did they flow to before you dug out the car park?

Before the car park the pipes just petered out hidden beneath soil and bushes next to a track.

Tbf the vol of water is not just from these drains but they are contributing.

We never expected the woodlands to be drained!

 

[upnortheast]

Can you dig a ditch, or " french drain " to intercept the water and take it away ?

 

[David1968]

Before the car park the pipes just petered out hidden beneath soil and bushes next to a track.

Tbf the vol of water is not just from these drains but they are contributing.

We never expected the woodlands to be drained!

You need to divert the water. Playing King Canute won't work.

As others have said, you need to dig a ditch across the bottom of the wood to take the water elsewhere. Either leave it open or, if the ground's not stable enough, put a perforated pipe in and gravel it all the way to the top.

If you're using a pipe, make sure it's big enough to take everything you've seen on the worst day.