La Rigole de la Plaine

The last two days I shot photos of the " Canal du Midi" and the "Lac de Saint Fereol" today this photo is "La Rigole" , this small canal dug during the century XVII was necessary to have water at the "Seuil de Naurouze" the top of the "Canal du Midi".
"La Rigole" folow the level line...
Pierre Paul Riquet was a great Enginer , not easy at that moment to verify if possible...
This one is "la Rigole de la Plaine" , an other one is before the lake to take water of an other side"la Rigole de la Montagne"