Heavy rains or flooding can be harmful to your lawn. If the lawn is underwater for less than four days, the temperature is below 60 degrees and no erosion takes place, then chances are high that the lawn will survive.
Remove all debris, silt and mud deposited on the lawn after a storm. In cases of a hurricane, salt water presents a danger. If either salt water or oil has contaminated the soil, be sure to flush the lawn with water until you’re confident the root system is free from contaminants.
If you’re having frequent flooding problems, fill in any low spots or depressions in your lawn and grade slopes so water drains away from the house and its foundation. If you’re still having drainage problems, consider installing a drain tile.
Lots of wet weather often causes the growth of mushrooms, which work to break down old organic matter in the soil. Mushrooms are not harmful, so you can mow them down if you like.