Returns a dict of QMED methods using all available methods.

        Available methods are defined in :attr:`qmed_methods`. The returned dict keys contain the method name, e.g.
        `amax_record` with value representing the corresponding QMED estimate in m³/s.

        :return: dict of QMED estimates
        :rtype: dict

def qmed_all_methods(self):
        """
        Returns a dict of QMED methods using all available methods.

        Available methods are defined in :attr:`qmed_methods`. The returned dict keys contain the method name, e.g.
        `amax_record` with value representing the corresponding QMED estimate in m³/s.

        :return: dict of QMED estimates
        :rtype: dict
        """
        result = {}
        for method in self.methods:
            try:
                result[method] = getattr(self, '_qmed_from_' + method)()
            except:
                result[method] = None
        return result