OptionallangOptionalminOnly stations with lhpClass >= minClass, an integer from -1 to 4. Gauges
without a class (lhpClass null) never match; an off-scale class rejects with
a HochwasserzentralenParseError. Applied after the fetch.
OptionalstatesOptionalwaterOnly stations whose water (river) name contains this text: compared
case-insensitively on the NFC form, whitespace runs = one space, ß = ss,
ä/ö/ü = ae/oe/ue (or without the diacritic), Unicode dashes = -. Applied
after the fetch (the API has no such parameter); a blank value is rejected.
Parameters for
client.stations().