def reynolds_number(v: float, d_hyd: float, kin_visco: float) -> float:
    """
    Calculate Reynolds number.

    **Parameters:**

    - `v`: (*float*) = flow velocity [m/s]
    - `d_hyd`: (*float*) = hydraulic diameter [m]
    - `kin_visco`: (*float*) = kinematic viscosity [m^2/s]

    **Returns:** (*float*)

    """
    return v * d_hyd / kin_visco