I would say about another foot of sub-soil now and then about the same of top soil.

Thx for the reply. Exactly what is/where is best to source sub soil? What material should I be looking for in sub soil?

To be honest i would have a really good think ref this washed away land by the results of a brook,

Are you sure a repeat of the same washing away wont happen the first time we have more flooding rains?

Perhaps you should wait a while, maybe ensure the edges of this re(claimed land is very secure from the brook,

How about until the test of time is complete to just cover the area with deep gravel, (a sort of shore line idea)

The reason im saying this is because we're all looking at very different thoughts now when buying houses etc,
the old dream to live next to a river /pond/lake the sea has woke us all up to the changes we're seeing in the weather's pattern and just what damage water to close to houses & gardens can do.
Even house insurance companies are now asking how close to such water feature's your wanting to insure because of past damage.

Regards Dungy.

Both sub soil and top soil would have to be supplied by a local supply firm. there are plenty of them around.
I assumed that you had taken reasonable steps to ensure that the brook cannot repeat the damage in the future.

Dingy
Thx for your reply. I have already shuttered up at the brook side and erected a new fence line all in treated water resistant timbers. The damage occurred over the forty or so years since the house was built. The brook is only small but does rise and run fast in periods of torrential rain. The new fence line will be enough to give me 15 years in similar conditions before needing attention.

Owed boggy
Thx for your comment. I have seen top soil in various DIY and garden centres but haven't come across sub soil. Who would supply that, builders merchants? What does/should sub soil consist of?

It might be worth contacting a farmer to see if he would let you take the surface off part of a field of meadow grass.
Easier to shift. Then stack the turves upside down to fill the gap.
Expect he will want paying.

There are companies which supply top soil by the lorry load. The nearest one to us here in this part of the world is Dandy's. That kind of company would be able to tell you if they have any sub soil available. If not, then fill the hole with top soil.
No matter what you do it is going to cost money.

Diane and Owdboggy thank you both for your suggestions. Interesting what you came up with Diane and in fact I'm going to local stables to get some manure to bulk out top soil and gravel mix then top off with some quality top soil or turf. Thx again.

My garden here is clay base soil, because when these flats were built, and the topsoil moved back for the footings to be put in, the rogues working for the builders came over on weekends, and used the forklifts and lorries to steal it. They sold topsoil £100 per load 10 years ago, it was wicked.
Leaving the new tenants trying to make a garden with clay soil. Patio Roses grow well, thats about all.
So where are Dandys getting their topsoil from ?

No idea Diane, but usually these people get the soil from Road making and such like. They are a reputable firm, as far as I know.