.......... when the owner does not wish to pump them out and we don't wish to try to float on them.
Serious suggestions please colleagues.
There are four ponds in total and are not "too sweet" if you catch my drift.
They will never freeze over.
On other such projects the ponds were all drained and sides rehabilitated at the same time as we took elevations on the pond floors.
Remote floating depth sounders may work but the 'stuff' on the top and the 'bubblers' provide a challenge.
Thank you for your anticipated input.
Cheers,
Derek
You know you do not have to take every job that comes your way.
This may be one of those jobs.
Just tell the client that you will take a pass on it.
Cleaning your transducer alone after the field work will be a "challenge".
How far across?
If not to far. How about stretching a cable across with a pulley? You could shoot the pulley with a reflector-less TS for N,E,Z and have tape or such on the weighted cable every foot or 1/2 foot.
Time to contract with the Remote Sensing people.
They can measure the surface of the ground and also the bottom surface.
One of the firms in Portland, Oregon use these methods for hydrographic data acquisition for the Corps of Engineers and for NOAA Office of Coast Survey to
update the US nautical charts.
Let me know if you need some contact data.
I would try a standard depth finder. It's may work good enough despite the bubbles. I would assume the bottom of the lagoons are reasonably smooth so missing a few shots (around the bubblers) may not affect the accuracy too much.
To get the correct volume you need to get through the "muck". That means sitting in a boat and "shoving" your rod through the stuff until you get to something "solid". This would be really important in a treatment pond.
GOOD LUCK!+o(
Very simple
Do a topo at the surface and up to the top of the dikes. Dump millions of tiny ball bearings into the lagoon until the bottom of the liquid level matches the original surface level. Determine the volume of the millions of tiny ball bearings and you will have your answer.
Thank all of you.
The amount of sludge is a factor of great concern.
I have no desire to get close to it either.
Stay tuned,
Cheers
Derek
I believe that I would pass on this one. Or sub it out to someone equiped to do the job.
The depth finders have to know the speed of sound in the liquid. Is that different enough in this liquid to be of concern?
I will try to bring here the picture you referred to.
I thing the guy needs a gas mask, in the content of this thread, 😉 I believe this is a mini-prism on top of the stick.
