Had a 3/4 acre pond dug last fall and before I could get the grass growing on the side good we had 6" of rain that washed a lot of clay off the sides into the pond..now I have these unsitely gullies up the bank...some of the bank was covered with topsoil and some is left in clay..do these gullies pose a problem for the dam wall? what is the best way to fix the problem?? Is there anything that will grow in clay soil and hold the clay together? What is the best way to plant grass on the sides of the dam?? has anyone used hydroseeding??