The city has some serious problems to solve, and it needs your help.
The river has been overflowing and flooding homes. We need to control the water level.
A hurricane damaged part of the city. We need to deliver supplies to the residents.
Some people are not recycling because it takes too much time to sort. We need a way to make recycling quicker and easier so more people will do it.
Your challenge is to come up with a solution to one of these problems, and make a model to show how your solution works.