Congratulations on your new job as plant manager at the waste water (sewage) treatment plant! After you hear every "crap" joke a thousand times you finally "wade in" and start to analyze a front end process -- the well that acts as a buffer for the rest of the plant. Waste water treatment plants do not like abrupt changes to the incoming flow rate. However, thousands of bathroom "throne jockeys" could care less.
If you change the flow rate too fast then the plant might not adequately treat the waste. If you don't change it fast enough then the sewer lines could back up and the city residents are up to their ears in crap.
The purpose of this well is to act as a buffer and to slow down the incoming flow rate of change.
Can you tune this controller and keep both the plant and bathroom users happy?
1. If you are running Internet Explorer, click here to run this example on-line in your browser. When the file download window appears click on "open this file from its current location".
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