Putting drainage into the garden involved a considerable amount of disruption and digging three foot trenches. Within a few hours, the garden resembled a battlefield.
We had to hire a contractor to do the digging and drainage, as this was far beyond anything that we could undertake. In order for the drains to be effective, they have to slope down with the gradient of the garden.
This view was taken from upstairs and shows just how much digging was involved.
A large part of the back deck had to be dismantled to allow access for the digger.
Once the trenches were dug, a membrane was placed in the bottom and then the hole back-filled with stone.