Rain can collect easily in a dried out waterbed called a _____________

gully, washout, dry creek, dry lake, and about a thousand other terms: surely you had some vocab words to go with this assignment.

That could be a gully, a gulch, an arroyo

It could also be a wadi.

Rain can collect easily in a dried out waterbed called a "Cistern".

To arrive at this answer, you can follow these steps:

1. Start by understanding what a waterbed is. A waterbed is a large, fluid-filled mattress typically used for sleep or relaxation.
2. Consider the purpose of a waterbed. Waterbeds are designed to provide a comfortable sleeping surface by distributing weight evenly across the mattress.
3. Imagine what can happen to waterbeds when they are not properly maintained or left unused for an extended period. Over time, the water inside the mattress can evaporate or leak out, leaving the bed empty.
4. Think of a term that describes a dried out waterbed that retains water, like a receptacle for collecting water. The word that fits this description is "Cistern".
5. Confirm your answer by searching for the term "cistern" to verify that it aligns with the definition you have in mind.

Therefore, a dried out waterbed capable of collecting rainwater is known as a cistern.