This is a test of commonsense. Complete the next sentence:

How to fix poor soil drainage
Identify where water collects.
Watch your yard during rainfall. Note exactly where water tends to pool and sit.
Also take into consideration how light or heavy the rainfall is, which may affect how large the affected area is. Plant stakes or flags in the center of the area and/or its borders while it's still wet if you think you will lose sight of it once it dries.