Apparently I was not clear enough. There is no main usage, except keeping water levels in all parts of the polders within very narrow range. All else varies according to varying needs, wishes and opportunities. If it rains a lot, the whole system drains. If it doesn't rain at all, the whole system irrigates. If it rains exactly the amount that evaporates and leaks, the system just holds water. In the meantime you can use the bigger ditches and canals for human things like boating, fishing and small transport.
Vr gr Peter Elderson Op di 4 jun. 2019 om 16:36 schreef François Lacombe < fl.infosrese...@gmail.com>: > > Le mar. 4 juin 2019 à 14:07, Peter Elderson <pelder...@gmail.com> a > écrit : > >> All the waterways can drain, transport water/people/goods, and irrigate, >> as needed. >> > > Transportation is not transmission. Transportation of water over a canal > means loading water into boats and send them over the canal. > Those canals aren't intended to transmit water like the Los Angeles > Aqueduct does. > > Many headrace or transportation canals can also serve a water discharge > where local drains end. > Drainage can't be the first usage because if drainage water stops, > transportation, navigation and irrigation should still be possible. > Then, the two main usages can be irrigation and transportation according > to your explanations > > Am I wrong? > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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