Explain the current problem
Describe where water collects and when: rain, snowmelt or irrigation. Note downspout outlets and nearby low areas. Ground-level photos during normal conditions can help; there is no need to enter an unsafe flooded area.
Consider the surrounding elevations
Doors, garage floors, existing pavement and neighboring grade constrain the layout. The plan should show how the new surface connects to them. A slope chosen without considering the outlet may move a puddle rather than solve it.
Separate slab work from drainage systems
A drain, underground piping or broader grading may be a separate scope with its own requirements. Ask who designs and installs it and where discharge is allowed. Avoid assuming water can simply be directed toward a street or neighboring property.
Check the proposal as a whole
Confirm finished elevations, intended flow direction and responsibility for any downspout or landscape changes. Drainage should be considered before excavation and revisited when site conditions become visible. It is easier to resolve these details before the concrete is placed.