Page 394 - Materials Chemistry, Second Edition

CAT3525_C10.qxd 1/31/2005 12:00 PM Page 365
The Sanitary Landfill 365
● Leave the “geotextile transmissivity” cells blank and Press Page Down to continue
● You have now finished editing the soil and design data and will continue to the next step
in the simulation

Step 4: Specifying Runoff Curve Numbers
● Scroll down and select “HELP Model Computed Curve Number”
● Enter a slope of 4% and press <Enter>
● Enter a slope length of 75 ft and press <Enter>
● Leave the soil texture of 18
● Enter a vegetation code of 4 to denote a good stand of grass
● Again the F2 option describes the different vegetation types
● Press Enter and the HELP program will compute a runoff curve number What is the
runoff curve number?

Step 5: Verifying the Soil and Design Data
● Press F10 to verify your parameters
● Scroll up and press <Enter> for each item on the menu. An “OK” should appear of you
have entered all of the data appropriately
● Once you have done this scroll to the Save Soil and Design Data, again enter your name
into the file space
● Press Page Down to return to the main menu

Step 6: Running the Simulation
● Now that you have entered or specified all the required data, you are now ready to exe-
cute the HELP simulation
● Select Execute Simulation from the main menu and specify the file name of the data that
you saved
● Next, press Page Down to continue
● Leave the default values in the output selection and press Page Down again to begin run-
ning the simulation
● HELP has now performed the simulation using that data that you entered

Step 7: Viewing the Results
● The main menu should be displayed at this point
● Scroll to View Results and press <Enter>
● Press Page Down to proceed to the specified viewing file
● You should now see the result of your simulation displayed
● Use the Arrows or Page Up/Down to navigate through these results

QUESTIONS

Answer the following questions from the Table near the bottom of the results labeled “Average
Monthly Values in Inches for Years 1974–1978”

1. Which month/year experienced the highest precipitation?
2. What was the volume of runoff in March/September?
3. How much lateral drainage was recirculated into Layer 1 in April/October?
4. When was the lateral drainage collected from Layer 1 highest? Lowest?
5. When did the most leakage occur through Layer 2? What is the volume?