Manilha
The manilha was an old Madeiran unit for measuring irrigation water, equal to 16 anéis or 128 penas. By the time of writing it was little used, though drinking water was still sold by the pena.
Water was formerly measured in manilhas (old water-flow measure: an orifice one palm in circumference, = 16 anéis), anéis (water measure: 1/16 manilha = 8 penas) and penas (traditional unit of water flow, roughly 1/60 litre per second), each manilha containing 16 anéis and each anel eight penas.
According to an official letter dated 8 November 1849 and published in vol. II of the Epocha Administrativa, the manilha was ‘an orifice one palmo (span, about 22 cm) in circumference’.
The manilha is little used today, but drinking water is still sold by the pena, half-pena and quarter-pena, as in the days before the metric decimal system came into force.