Any difference of opinion which may arise under either of the two last preceding sections between a local authority and any person as to whether—
any sewers, drains, culverts or pipes substituted or proposed to be substituted for sewers, drains, culverts or pipes of a local authority are or will be equally effectual, or entail or will entail additional expense on the authority; or
the supply, quality or fall of water in any reservoir, canal, watercourse, river, stream or feeder is injuriously affected by the exercise or powers under this Act,
may, at the option of the party complaining, be referred to an arbitrator to be appointed, in default of agreement, by the President of the Institution of Civil Engineers.