It's not irrelevant because De Lille says that's what we must save to accommodate them. 50ML is 10% of the daily target of 500ML, and 700ML if they stay 14 days. 
Come on, Farsouth! Are you're saying 700ML, which can accommodate the ENTIRE city for over day, is not significant? Why do you, De Lille, city, politicians and DA supporters still have your heads in the sand, or a place civility prevents me mentioning? Was arithmetic - 1+1= 2 - not your subject at school? What economy - tourism or otherwise - or society will we have on the expected day before or after March 2018 when the water runs out? 
Actually, I don't mean visitors can't come, but not if they're being irresponsible and illegal ito restriction like hotels that provide and visitors who expect baths, showers and all the trimmings and many other businesses who are not conserving water, like the two-person micro-business that uses 1KL a day and city doesn't ask what's going on.
Let's be sensible, shall we.