Explain your observations 4 reach into the rear of

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well #6? Explain your observations. ____________________________________________________________ _________________________________________________________________________________________ __________________________________________________________________________________________ 4. Reach into the rear of the tank and close the discharge area (turn the green handle 90 degrees either way). Now, open the stream valve. In this exercise, the dye will represent some toxic pesticides or herbicides. a. Make sure the stream is flowing properly. b. Add one drop of dye to well #6 and follow it with a squirt of water. c. What happens to the plume of contamination? _______________________________________________ _______________________________________________________________________________________ d. How does this impact the water table? ______________________________________________________ _______________________________________________________________________________________ e. Add another drop of dye (pollution) to the well. Where does the contamination end up and approximately how long does it take for the water to clear up? __________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ f. If this model represented a real contamination scenario, how would the pollution impact a community who relies on water from this groundwater source? ____________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ g. If you were going to build a house on this model, which well would you want as your drinking water well? Why? __________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ TA CHECK_________________
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Lab #6: Streams, Coastlines & Groundwater 93 Homework Activities Activity 1: Streams 1. Describe the relationship between water velocity and deposition and erosion of sediment. Think of where erosion and deposition occurred in the stream table. _______________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 2. Think back to the In-Class activity and how the placement of structures impacted the stream behavior and vice versa. What factors would be different in the real world? ____________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ Activity 2: Coasts 1. Go to the lab Canvas page and download the pictures and data from the coastal wave experiment. In the space below, use colored pencils to draw the changes is the coastline over the course of the day. a. Draw the coastline in the 8:00 am picture. b. Using a different color, draw the coastline in the final picture. c. Label the north arrow, scale bar, and show the direction of the incoming waves. d. Label coastline features, which may include: headland, lagoon, islands, direction of longshore transport, etc. 2. Comparing the first and last images, where did the most erosion occur (sediment 1 or sediment 2)? What about de - position? __________________________________________________________________________________ __________________________________________________________________________________________ 3. Now look at the entire sequence of pictures. Describe the changes to the coast line over the course of the day. In particular, compare the erosion and deposition patterns between storms and daily events._________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ Beach side Water side
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Lab #6: Streams, Coastlines & Groundwater 94 4. Look at the measurements of sediment thickness. Plot the results on the graph below, with time on the horizon- tal axis (the dependent variable) and sediment thickness on the vertical axis (the independent variable). Write the thickness values on the vertical axis. Be sure to plot both sediment 1 and sediment 2. a. Does sediment 1 thickness increase, decrease, or remain constant over time? What about sediment 2? Ex- plain. ___________________________________________________________________________________ ________________________________________________________________________________________ ________________________________________________________________________________________ b. Label storm events on the graph. Activity 3: Groundwater 1. What is the difference between porosity and permeability? _________________________________________ __________________________________________________________________________________________ 2. Which sedimentary rocks tend to be more porous? Less porous? ___________________________________ __________________________________________________________________________________________ 3. In many parts of the world, water demands can only be met by pumping groundwater.
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