I'm in the initial research phase of landscaping my side yard, which is currently filled with pea gravel. The developer/architect provided the below plans for how water flows into the drain at the end of my yard (where the lounge chair/bistro table is in the mock). I've been told that the ground is sloped downwards toward the drain. Will I need to add in some sort of drainage if I plan to turn the yard into the below? Any tips would be appreciated! I plan to use turf instead of real grass, if that matters.

Mock of design: