How much room do I need to perform an ERI survey?

Short Answer: Divide the depth you need by 0.15 to find how many meters you'll need to perform a survey.

Long Answer: How much room you need to perform a survey depends on what depth you need to image. A good rule of thumb would be to divide the depth you need by 0.15 (note: 15% of spread length).

Here's an example:

Let's say you need to image 12 meters in depth. You would use the following calculation:

12m/0.15 = 80m

You would need 80 meters in length to lay out your electrode cable. This 15% spread depth factor can be significantly expanded by utilizing remote/infinity electrodes.