With hard surface draining it really comes down to the existing drainage apparatus in place. In most cases, your concrete or brick was put in place with a drainage plan in mind.
It will be sloped to direct water to another part of the lawn or into a drainage pipe. If you’re already experiencing drainage problems on your patio, you’ll need to have them corrected before having artificial turf installed.
The backing material on your grass will also act as a turf drainage system. It will allow water to flow across it to drainage pipes or to drain down into holes drilled through the hard surface.