Wheaton Sanitary District’s Waste Water Treatment Plant (WWTP) capacity is measured in millions of gallons per day (MGD). Wheaton states in their Virtual Plant Tour that the WWTP is designed to treat a dry weather flow of 8.9 MGD, a design maximum flow of 19.1 MGD and a peak wet weather flow of 45 MGD (WSD, 2015).
Wheaton Sanitary District meets its peak demand through the use of four "Archimedes type" screw pumps. Each pump lifts the wastewater up from the main interceptor sewers into the plant. Each screw pump is 6 feet in diameter and 40 feet long. They are driven by a 100 horsepower motor and have a capacity of 15 MGD. Normally demand flows can be maintained with only one screw pump in in operation for wastewater treatment. During wet weather periods, up to three pumps may be required with a maximum flow of 45 MGD. By law, the plant must be able to operate with the largest pump out of service (WSD, 2015).

Wheaton Sanitary District Operating Data 2015 2014 2013 2012
Average Flow 6.0 MGD 7.38 MGD 7.39 MGD 5.96 MGD
Peak Flow 9.13 MGD
Week ending 3/14/15 14.01 MGD
Week ending 5/17/14 27.23 MGD
Week ending 4/20/13 9.91 MGD
Week ending 1/28/12
Minimum Flow 4.91 MGD
Week ending 2/28/15 4.79 MGD
Week ending 11/22/14 4.64 MGD
Week ending 10/26/13 4.67 MGD
Week ending 12/8/12

Week Flow MGD Week Flow MGD Week Flow MGD Week Flow MGD
03/21/15 7.26 12/27/14 6.53 12/28/13 6.88 12/29/12 5.45
03/14/15 9.13 12/20/14 5.14 12/21/13 5.95 12/22/12 7.27
03/07/15 5.16 12/13/14 5.24 12/14/13 5.23 12/15/12 5.41
02/28/15 4.91 12/06/14 5.29 12/07/13 5.48 12/08/12 4.67
02/21/15 5.33 11/29/14 6.76 11/30/13 5.77 12/01/12 4.69
02/14/15 6.05 11/22/14 4.79 11/23/13 7.37 11/24/12 4.82
02/07/15 5.39 11/15/14 4.99 11/16/13 5.79 11/17/12 5.22
01/31/15 5.6 11/08/14 5.04 11/09/13 6.83 11/10/12 4.85
01/24/15 6.04 11/01/14 5.36 11/02/13 7.24 11/03/12 4.91
01/17/15