Dead Zones: Graphical Analysis Assignment: Create two (2) graphs based on the data below and answer questions related to the data. Graphing: The data in Table 1 (below) are the yearly flow of water and the amount of nitrogen input into the Chesapeake Bay. Plot the annual flow data versus nitrogen input data on a scatter plot. Plot the water flow per year as a column graph.

Dead Zones: Graphical Analysis

Assignment:
Create two (2) graphs based on the data below and answer questions related to the data.

Graphing:
The data in Table 1 (below) are the yearly flow of water and the amount of nitrogen input into the Chesapeake Bay.

• Plot the annual flow data versus nitrogen input data on a scatter plot.
• Plot the water flow per year as a column graph.
• Use Excel to construct your graphs (select the scatterplot option for the yearly flow and nitrogen load graph and the column option for the water year and annual flow graph).
• Be certain to clearly label all axes (including units) and provide a descriptive title in the form of a sentence.
  Analysis:
  In several (3) well written paragraphs, describe the relationship between river flow and nitrogen input based on your graphs:

1. What is that relationship between river flow and nitrogen loading into the Chesapeake Bay?
   Refer to your graph to explain your answer.

2. A) What are the 4 sources (parameters) that went into calculation of the “Rounded Total” of nitrogen Pollution Load entering the Chesapeake Bay?
   You will need to investigate the data set found at: https://www.chesapeakeprogress.com/clean-water/water-quality

   B) Which of these sources is not due to river/water inputs? Which of these sources (parameters) contributed most to the rounded total load?

3. A) What is the expected relationship between nitrogen loading and dead zone formation? Be sure to describe the connection between eutrophication, nutrient pollution, and dead zones.

   B) Based on this relationship, during what water years would you expect the Chesapeake Bay dead zone to have been largest? Would you expect the 2018 dead zone to be larger or smaller than the dead zone in 2011? Explain your answers.

Table 1. Annual Chesapeake Bay River Flow and Nitrogen Loading for Water Years 1990 through 2018.