T3RRA has a drain collection mode that you must use when surveying drain lines. The button is at the bottom right of the survey collection map window.
When in 'Drain survey' mode you must drive the length of the drain in order to collect the data. It doesn’t matter whether you drive from source to outlet or vice versa. When points are collected in 'Drain survey' mode the data points are displayed as squares.
Available features:
Delete all or portion of drain line.
Extend drain’s length.
Split drains.
(see Drain specific edit controls)
After you have finished surveying:
- Design drains from either direction.
- Choose Best-Fit, Multi-Fit, or Linear-Fit drain design.
- Add batters/backslopes to drains.
- Export drains as guidance curves.
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