Final answer:
The Flint Water Crisis occurred when the city switched from Detroit's municipal water to the corrosive Flint River. Urban areas often consider sources such as lakes, rivers, and reservoirs for drinking water.
Step-by-step explanation:
The question refers to alternative water sources that were considered for Flint, Michigan, during its water crisis. Originally, Flint's water supply came from the Detroit municipal system, but due to financial decisions, the city switched to the Flint River, which proved to be corrosive and led to lead contamination and the Flint Water Crisis. While the question does not specify other alternatives, it is common for urban areas to consider a variety of sources such as lakes, rivers, reservoirs and, in some ancient cases, aqueducts from distant sources like glaciers or the collection of rainwater.