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 09-16-2003, 20:02 Post: 64075
TomG

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Location: Upper Ottawa Valley
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 Is My Retaining Wall Level

I used 1/4" tubing and wished I had used 3/8th. Air comes out of most water inside the tube and bubbles can form air locks that really throw off the level. I still use my 1/4" level but it takes the bubbles a long time to rise through 30' of 1/" tube (half my level length). Air rises a lot faster in 3/8th tubing.

The reservoir idea on the fixed end is good. A large enough reservoir in relation to the volume of water in the tube and for most purposes you don't have to re-calibrate the level when you move one end. 3/8" tubing holds more water than 1/4"and takes a larger reservoir to achieve the same accuracy.

Lazers are dandy but a water level can check the level between points that don't have a sight line. You just have to be sure you don't get an air lock at the top of anything the tubing goes over, and it can't go over anything higher than the tubing ends.

For checking grades I tie the ends onto some lighting stands I have and then measure down to grade along a plumb line. It works better if there's a bit of a head of water at each end of the tubing. I can just raise the stand at the low end to get about 10' of head if I need to.






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 09-18-2003, 08:14 Post: 64234
TomG

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 Is My Retaining Wall Level

The question 'Why?' is a good one. I understand that there's a satisfaction in doing it because you can. I also understand that it's a luxury us amateurs can indulge in.

I suspect that if GPS systems get much better we can throw away all of our levels--at least for most practical purposes.






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