Lawn Blister

That is what I am calling it.  We had a very heavy rainstorm the other night for which we are very grateful.  The rain gutters feed into French drains to avoid puddles at the edge of the concrete.   The volume of water was so large that water was pushing the lawn up into a bubble.   This lawn is a year old at least.   Not being able to handle this much water was startling. 

The wasps who had nested in the rain gutter were not too happy, either.