Dealing with a blocked outside drain is unpleasant, but it is often a job you can handle yourself without calling a plumber.
If you have a pressure washer with a drain-cleaning nozzle (or hire one): how to unblock outside drain
Before you start digging or poking, figure out where the blockage is. Dealing with a blocked outside drain is unpleasant,
To tackle an outdoor blockage effectively, you willGather these items before you begin: how to unblock outside drain
The manhole is located under a permanent structure or is too deep to reach safely.