Possibly not much use to the op, but from watching here's how to lay a mooring on the cheap. If you are up a muddy river in brazil anyway. These were slowly being installed for boats moored stern or bows to med style against a pontoon rather than have to anchor.
Dig a hole in the river bank about 1m3 at low water and fill it full of concrete with a ring on top.
Low water a few days later when you get round to it build a raft out of any old bits of wood and plastic cans lying around.
Next high water swim it out to where you want to be with a mask and snorkle then cut away the bits of string holding the raft together until it goes glug.
Next day stick a cheap workshop air compresser on a raft with power cord drifting back to pontoon so the local kid can dive with a diving regulator pluged into the compresser and get shouted at each time he comes back up without being able to free the yacht anchor chain next door which is stuck under the concrete block.
Somehow it all works in the end.
is there enough tide where you are to make your own?
