calculating the depth of water

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#1 Post by **Keeper** » Fri Aug 01, 2008 3:16 pm

Has anyone got an accurate rule of thumb for calculating the depth of water. i.e the the weight of the sinker x time (secs) to hit bottom = depth.

I have one or two marks where a 5 oz lead is taking 23-25 seconds to sink and I'm wondering what the Depth is.

#2 Post by **shamoo0804** » Fri Aug 01, 2008 4:26 pm

Easiest way I would imagine, would be to let your line out in the back garden (presuming you have one) and measure how much line you retrieve on each full turn, then multiply it up as needed.

I'm a bit of a novice myself, but that seems a logical way of doing it.

Hope that helps.

Mark

#3 Post by **stevecrow74** » Fri Aug 01, 2008 7:03 pm

shamoo, that would only really work for boat though..(and most of them have depth sounders)

it would be hard to calculate from the shore, and triangulation would be out due to bow in line, i.e distance and angle..

gravity under water changes with pressure and drag from object, but if you can find out what speed a 5oz lead travels in water and work it out that way, still wouldnt be accurate but would give you an idea :wink:

#4 Post by **philthefish** » Sun Aug 03, 2008 9:49 pm

The best way to find depth from the shore is to cast a running ledger rig with a float where the hook should be.release line from your reel by hand counting the amount of line.when the float reaches the surface you have your depth.

#5 Post by **Keeper** » Wed Aug 06, 2008 3:28 pm

thanks for the replies.
Will try the float method to see how that goes.