Station Numbers

LOGDRAFT will use either metric or US-unit station numbers (i.e., stations in either kilometers or feet). Normally, if your project uses US unit dimensions (meaning that you are entering depths in feet) LOGDRAFT assumes that your station numbers will also be entered in feet. Likewise, if your project is using SI units, LOGDRAFT expects that your station numbers will be in kilometers.

However, since you may have received your station data from another party, LOGDRAFT allows you to work with projects where station number units are different from the dimension units used for everything else, meaning that you can enter your depths in feet and the boring station numbers in kilometers. To do this, refer to this section for instructions on changing the units used with stationing information.

LOGDRAFT also allows you to group your borings into station groups. Station groups are useful, for example, in entering borings taken from different roadways. Membership in a particular station group is denoted by adding a one or two letter group name to the beginning of the station number -- for example, B32+000 indicates that the boring was located at station 32 in station group B.

LOGDRAFT mostly ignores station groups -- when the boring at station B32+000 is plotted on a profile it will appear under station 32 of the profile's horizontal scale -- but you can use the Coordinates frame on the Report Settings dialog to print a profile featuring only one station group. Do this by entering the name of the station group to be plotted into both the From and To "Station Number" boxes.

The table below gives some examples of valid US and SI station numbers:

Station Number Examples

You cannot use station numbers for printing profiles unless the data entry form you're using with the project was properly set up. See this section for a further discussion.

Printing Profiles of Borings with Station Numbers and Perpendicular Offsets

To produce a profile of borings that have station coordinates and offsets perpendicular to the centerline (for example, STA. 30+22, 11' RT), you must convert each boring's coordinates to a two-dimensional grid. The new two-dimensional coordinates are then entered at the boring's "North" and "East" coordinate prompts.

To do this, convert the boring's station coordinate to a feet/meters coordinate and enter this number at the "East" prompt. Next, enter the perpendicular offset as the "North" coordinate: Offsets to the left of centerline should be entered as negative numbers; those to the right of centerline should be entered as positive numbers. Once the North and East coordinates have been entered, you must leave the "Station Number" prompt blank.

A sample conversion follows:

1. Boring B1> Station 14+12, offset 13' RT of centerline
2. Boring B2> Station 16+10, offset 12' LT of centerline

Should be entered as:

1. Boring B1> East: 1412 North: 13
2. Boring B2> East: 1610 North: -12