Welcome! Thanks for your interest in exploring the ParFlow Sandtank. We designed this interactive computer simulation to facilitate learning about real hydrology concepts. This model will allow you to dive into the world of groundwater hydrology, making decisions about inputs to groundwater aquifer systems, visualizing model outputs, and learning about various factors that impact real environmental systems. We hope you have fun and learn a lot using this interactive educational tool!
Getting Started: This manual is designed to familiarize you with the parts of the ParFlow Sandtank model and the options available to you as a user. We hope this builds your curiosity and draws you over to our other available lessons to use with this sandtank model.
Now that you’re an expert on all the available buttons, let’s move to the actual tank and get running! There are 11 wells in the ParFlow sandtank. Each well has a pumping/injection/off switch above it, described below.
BASIC SANDTANK RUN:
Now let’s walk through a simple exercise using the ParFlow Sandtank to test your skills:
Open the ParFlow Sandtank:
Click on the River/Lake dropdown menu and choose “Lake”.
Click the “Run” button in the upper right corner.
Click on Tank Conditions button.
Scroll down to the Soil Material Selections.
For soil material number 1, move the slider to “Loam”; For number 2, move the slider to “Sand”; For number 3, move the slider to “Gravel”; For number 4, move the slider to “Clay”.
Set each Hydraulic Head slider to about 40.00.
Click on the “Run” button.
Observe the timesteps passing and the water table rising.
Notice that your lake is filled with water; mouse over the Question Mark button and see how much water is being stored in this feature (should be around 81m3).
Move the Water Opacity slider to the middle so you can see the soil materials better through the water.
Hover over Well D, the 4th well from the left. Inject 45 units of water by clicking on the red arrow until the number above the well is 45. Click the “Run” button.
Observe the water table rising and the introduction of pollution to the system.
Click on the River/Lake dropdown menu and choose “River.” Click the “Run” button.
Observe as the Lake drains—what is the river flow? (Remember to hover over the Question Mark button)
Drop the right Hydraulic Head slider to about 10.00. Click the “Run” button.
Watch as the water table drops down—you may have to select “Run” multiple times.
Good Job! The skills are strong with you! Now go look at some associated lessons and become more of an expert!