[Wheaton Sanitary District](http://www.wsd.dst.il.us/). This tour of a wastewater treatment plant is an example of a high-volume, public project. How is...

 Wheaton Sanitary District. This tour of a wastewater treatment plant is an example of a high-volume, public project. How is capacity defined at a wastewater treatment plant? Throughout the year, the demand on capacity can vary significantly. How do they meet peak demand? Provide a quantitative analysis from the available information. What are the constraints involved in changing the capacity of a facility like this?