In-Situ Virtual HERMIT Tutorial - Manual (Page 41)

Drawdown Calculations 41
5.2 COMPUTING DRAWDOWN
The Virtual HERMIT software will also compute the drawdown while the
pump test is running. The drawdown is computed using the Level TROLL
that is in the pumping well (not the observation wells), which was selected
during the configuration of the HERMIT and Level TROLL instruments.
After the pump well TROLL is designated, the drawdown (how much the
water level has dropped from the start of data collection) is computed and
displayed on the screen for both the pump test (since start of test) and the
current step (since the last pump rate change).
The hydrologist can then see the drawdown values and the graphical
representation of what is happening in the pump well while performing the
test, allowing the hydrologist to determine when the next step should occur.
Level reminder
Set pump well to get drawdown
Set pump well to get drawdown
Drawdown and current step Communication status