Before installing mulch i try to make sure it is in a location that wont flood in heavy rain, and get with the customer and ask if the beds flood. I let them know that if the beds do flood badly there is a chance of the mulch rising and floating out of the beds. I have had one bad experience where the beds were directly below the end of the roof, and there were no gutters. I warned the customer but they wanted it done anyway.. after the first good rain i was raking mulch out of the yard around the beds. Other than this one yard i've never had much trouble.. is there any solution to this?? should i worry about installing mulch in the same situation (directly under the roof) only with gutters? I've heard laying a thin layer of mulch wetting it, then laying another layer on top and wetting it helps almost lock the mulch together... i've got a mulch job coming up and gutters are in place but i just want to make sure the mulch is going to stay.. i am using single ground hardwood and going 2.5 inch deep on a new bed. Thanks in advance!