An engineer constructs a model of a new dam that is to be built above the Danube River. He uses the same type of cement that will be used on the real dam. The dam design is called Arch-22. He tests the miniature cement dam using a pressurized water tank. Which predictions could NOT be made from using a model such as this?
A) The Arch-22 design may have weaknesses around the base.
B) A coating may need to be added to the concrete, as water weakens it.
C) The Danube River may rise above the level of the dam during Spring.
D) The Arch-22 dam needs to be sloped at 39 degrees, to give maximum strength.

The model is a miniature of the real dam that tries to predict things that can happen with the real one. In the model is possible to identify, for example, if the material is resistant to the corrosion of the water and if some extra material is necessary to be added, as stated in letter b. Also, the weakness of it can be found, as stated in the letter a, so, the engineer would know if it's necessary to reinforce it.

Also, the temperature effect can be noticed, knowing the average maximum temperature, its possible to identify how the material behaves at the temperature, as stated in letter d. But is not possible to know in the miniature if the Danube River will rise above the level of the dam. It must be constructed knowing how much the river rises during the spring (by the volume of the rain), but the miniature it's not necessary for this.