We have just completed construction of our new 5-acre pond. Prior to the pond filling, we have begun the process of gathering structure and placing it in the pond. I have several questions:

1) The tire reef which we constructed out of old tractor tires is tied together and have holes drilled in the top. Do we still need to secure the tires to the bottom of the pond to avoid floating? If so, what's best (cinder blocks, culverts, T-posts)?

2) The brush piles typically consist of a large (20+ foot) cedar tree. Do these need to be secured to the bottom?

3) What improvements to the structure would you recommend?

Photos are at: Pond photos