We are having our driveway block-paved, it will be finished tomorrow. The whole of the front is being done, which slopes down towards the house. When the guy came to quote he said he would put in one of those drains (with the metal grille on top) across the full width of the house (close to the house wall) and also continuing past the edge of the house on one side up to the boundary wall. What he has done today is to put in a gulley, a sort of row of concave bricks, across the front of the house, but not across the bay window and not across the path at the side of the house. He said he has done this because the drain that we had put in several months ago was not compatible with the type of drainage we originally agreed on. He said it would be ok because the blocks absorb 40% of the rainwater and the gully should take care of the rest. My concern is that in heavy rain the water will run down the drive and overflow the gully, which is quite shallow, and lap against the house. Does anyone have any experience of this type of thing?