Much of the eastern seaboard is currently experiencing incredible amounts of rain. Flooding from once small streams, as well as rivers is occurring. Neighborhoods are also being flooded by storm water runoff as the municipal water systems are being stretched beyond their limits. Under all this water is your garden - will it survive?
If the water is from a stream or river then you may well have nutrient-rich silt covering your garden which is beneficial. Let the water drain and let your grass grow through the new layer of 'soil'.
If the water is from storm runoff then there will be no nutrients and as the water seeps into the ground, it will leach nutrients. These gardens and lawns will need a little extra help when the water finally drains away.
For any garden though that is underwater, wait for the water to thoroughly drain before you attempt to walk on the grass or mow it. Molds and funguses can be spread easily by walking over the wet grass. Do not let children make slides in the wet soggy grass either, though it is fun to do! The health departments tell us that bacteria can be a problem for the children, and your grass will need a major repair job when the puddles have gone.
So be patient, and wait until the rain and flooding have departed. Plan a new garden or read a good book or browse around the other Suite topics to occupy your time!