# theisRecoverySeries

> Theis recovery series: ratio = t/t′ (time since pumping started over time since it stopped) against the residual drawdown, or against the depth (residual: false) when there is no static level. Empty when the pumping duration is unknown.

> **theisRecoverySeries**(`event`): `object`[]

Theis recovery series: `ratio` = t/t′ (time since pumping started over
time since it stopped) against the residual drawdown, or against the depth
(`residual: false`) when there is no static level. Empty when the pumping
duration is unknown.

## Parameters

### event

`HydrodynamicEvent`

## Returns

`object`[]