This isn't asking a question, it's telling you what you should include in a fictional story.  A fictional story is one that is made up, yet it can be based off of or have the idea of a true story.
 
        
             
        
        
        
I dont get what your asking if there was more of a description i would be able to help
        
                    
             
        
        
        
Answer: 
After the first paragraph.
Explanation:
You will know when the introduction has moved on because at the end of the introduction, there is a thesis statement. The thesis statement is how you will know when the introduction has moved on.
 
        
             
        
        
        
Groundwater flows through rock with a high porosity and a high permeability at a fast rate. The denser and less permeable  the rock is, the slower the groundwater moves. The greater the permeability of a rock, the faster the groundwater flows through it. Groundwater is water that is found in spaces and fractures in rocks, as well as in the sediment between the earth's surface. Groundwater starts off as rain, hail or snow. It seeps down through the sand and soil into the groundwater system. The groundwater eventually flows into rivers, lakes or oceans.