From what point on the water you will be measuring with theodolite? In your pics it is a straight line, but in reality it's not. You might want to have a boat in canal with marked post, so it stops at the same distance near every road post, while measuring angle from across...

We will be measuring from the other side. Measuring from the surface of the water to a spot on the stick. The stocks will Be primaries every six inches but we will not know what the numbers are till we get there and are setup. Then we need to measure from the other side and we will know what the starting mark is for each stick.

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