Digging in water really washes out the grease in the pivot points, and might contribute to extra wear in those areas even if they are greased every 4 hours. That combined with having the soil wash back out of the bucket with the water, having the water wash soil back into the pond when the bucket of water/soil is placed on the ground, and not being able to really see what you are doing are some of the other problems when digging in water.

Not to mention a really muddy pond due to the suspended dirt while digging.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).