I live in a house that was built 30 years ago. My wife's grandparents owned the home and we moved in after they passed away.
We inherited a landscaping nightmare. A landscaper came in a few years back and added sod without properly preparing the yard or putting in proper drainage. Now, everytime it rains a bit the yard floods and the two small drains in the back don't drain well due to poor location and or roots growing into and plugging the drain.
What can we do short of tearing up the yard putting in new drains, that would require cutting through concrete (yard boarders)? We live in mild Northern California (Redding, CA).

Any tips and pointers or sound advice is greatly appreciated.