Every item of subsurface data, including sampling information, strata changes, penetration tests, etc., must be identified by the depth where that item was located:
- Depths are entered using units appropriate to the measurement system chosen for the project -- for the SI system, enter depths in decimal meters; e.g.,
1.75for 1 meter, 75 centimeters.
For US units, depths are entered in decimal feet:
1.75is 1 foot 9 inches.
LOGDRAFT reports can be set up to automatically convert depths entered in feet into depths in meters -- refer to the Customization Guide for details.
- The first card on the subsurface table usually has a depth of
0. On this card, enter the description of the material encountered at ground surface.
- The last card to be completed should list the depth at which the boring was terminated. Usually this will be the only item of information entered on the row; however, some users prefer to enter something like
BORING TERMINATED AT xxx FEET
in the card's material description field.
- Although it isn't necessary, LOGDRAFT will accept depths in the form start-end; e.g.,
10-12', meaning that the strata, sampler, etc. extended from 10 to 12 feet. The program won't use the second depth for anything (as far as LOGDRAFT is concerned, the 10-12' just means "the current depth is 10 feet"), but it can be useful as a quick guide to where a particular strata began and ended, or to intervals where sampling data were taken.
- This section gives some additional guidelines on how the program expects depths to be entered.