One century ago the growing City of Funchal needed a new water supply. In these times the system of the "Aguas dos Tornos para Abastecimento do Funchal" was built, see
This cache shows the old way of the water to the city of Funchal on Madeira.
The following map from www.cm-funchal.pt shows the area of the Ecologic Park. Also the bonus map in the description of "Hell's Throat" may help not to go a loop way. If you take the trail to Aguas dos Tornos from above or if you start to climb near the old water facilities (not recommended!) you have to add 1 point to the terrain rate.
note for those who cannot read maps ;-) :
After the bridge don't follow the new Levada dos Tornos. The Waters of the Tornos are crosssing the Levada underneath. The path crosses the Levada.
Click to see lager image.
As we do not live permanently on Madeira we can ask a friend who lives in Canico if maintenance is needed