Here is a list and description of the sections you should include in your report.
Introduction
Describe your research question in relation to the research problem, the role modeling work plays in answering the question and list your hypothesis with regard to the factors which effect the time it takes to drain a swimming pool
Methods
Describe the experiments you conducted in this section. Include information about the experimental setup motivate why you feel these were adequate for the hypotheses you were investigating.
Results
Describe the results of your experiments here. State which results belong to which hypothesis and what they mean for your modeling work. Be sure to include datasets and tables within this section to show evidence of your experiments and describe how you analyzed the information.
Conclusions
Describe your conclusions regarding your research question. Include information about how your model behaves and how well you think it predicts the time it takes to drain a swimming pool.
Discussion
Describe avenues for future research with this problem and an evaluation of your working method. Include how your model can be used in a different context, what you did well and what you would do differently and the limitations of the research you conducted.