Do I need to grade my turf for drainage in a small plot
1/8&quot; per foot or 1cm per m (minimum) slope away from the house is always needed, and will save a lot of problems with water infiltrating the house.
However, since this does not directly abut the house, if the paver area next to the house is properly sloped away from the house and the drain works, sloping the grass area away from the house is less important, unless there's so much water the drain is overwhelmed. I typically try to have 12 feet or 4 meters around the house consistently sloped away - after which things can change, if water management is adequate.