My family farm has a pump that floats on a raft in the middle of the manure lagoon. To prevent the raft from drifting away with the pump, we built cement anchors that sit on the banks of the lagoon. We used an empty tub that was once used for calf supplements as a mold for our quick drying cement. We then bent some rebar into a “U” shape and placed it inside the wet concrete to act as the hook for the rope to be tied to.
To the right is the empty tub we used as a mold. To the left is the finished dried cement block.