Time of Drawdown (t1) in Unsteady Flow Formulas

Time of Drawdown (t1) is the total period for the difference between the pumping water level and the static (non-pumping) water level. And is denoted by t₁. Time of Drawdown (t1) is usually measured using the Second for Time. Note that the value of Time of Drawdown (t1) is always positive.

Unsteady Flow formulas that make use of Time of Drawdown (t1)

fxChange in Drawdown given Time at 1st and 2nd InstanceGo

FAQ

What is the Time of Drawdown (t1)?

Time of Drawdown (t1) is the total period for the difference between the pumping water level and the static (non-pumping) water level. Time of Drawdown (t1) is usually measured using the Second for Time. Note that the value of Time of Drawdown (t1) is always positive.

Can the Time of Drawdown (t1) be negative?

No, the Time of Drawdown (t1), measured in Time cannot be negative.

What unit is used to measure Time of Drawdown (t1)?

Time of Drawdown (t1) is usually measured using the Second[s] for Time. Millisecond[s], Microsecond[s], Nanosecond[s] are the few other units in which Time of Drawdown (t1) can be measured.

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