A client of mine has recently had a new bluestone patio installed. As you can see from the photo, (during construction) the paving is laid to allow rainwater to flow to the edge of the grass/paving. I laid the new lawn with the sod at the same grade as the paving, as you are supposed to do. That allows the mower to run along with one wheel on the paving and cut the grass without the need for a weed wacker.
My client is complaining that after a rain the water is trapped at the auction of the paving and the lawn.
He is asking me to take up the sod and lower the soil so that when the sod is relaid it will be lower and allow the rainwater to run off.
I am planning to suggest installing a French drain at the junction of the paving and lawn and pick the water up and run it away beyond the hedge, that you can see in the top right of the pic.
I will look forward to hearing from you.
Regards;
John