pastas.rfunc.FourParam.get_tmax
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.. py:method:: pastas.rfunc.FourParam.get_tmax(p: pastas.typing.ArrayLike, cutoff: float | None = None) -> float

   
   Calculate `tmax` using approximation or root finding.

   :param p: Response function parameters.
   :type p: array_like
   :param cutoff: Fraction of the step response used to determine the response cutoff.
   :type cutoff: float, optional

   :returns: Response time in days corresponding to the selected cutoff.
   :rtype: float















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