Golieth Ball with Lifter Ring (Not Manifolded)
by reefball, published
And adjustable height breakwater artificial reef module where the bottom ring can be filled with rocks to make the crest height (top of the unit) level when used on a seabottom of variable depths used to control erosion and to create natural beaches without sand pumping.
This model contains "rocks" inside which were only a painted skin in Google Sketchup, and they will probably just turn out like square blocks. I will later try to refine this. This model has not been scaled. Any use must display credit to www.reefball.org as copyright owner although anyone can freely copy for model (not ocean) use.