What is meant by closing the urban water cycle?

Question

Having no net losses of water in the cycle
Using collected rainwater for drinking water
Re-using treated wastewater for drinking water treatment
unanswered

Answer 1

Maybe this will help:

The urban water cycle encompasses the engineered systems that protect water resources, form green infrastructure, provide essential and safe drinking water, ensure wastewater and sewage removal and manage stormwater to prevent flooding.