See below as I have copied and pasted and oldie but goodie....

1.38 -C- Do we have a control meter?

From:Lori Byron

Date:Fri, 20 Dec 2013 at 2:09pm

Category: Category 1 - SSWWEP Questions and Presentations

Frank Burdick’s Log Number: 51

Submitted by: Burdick’s Log, October CAC meeting

Category (1,2,3): 1

Status: Closed

Estimated date to address: N/A

Q.51. Is there a control for the three graphs OHM put up at the October 29 SSWWE CAC meeting? Robert C. (OHM) said that the whole City can act as a control because the FDDP has not had much impact on the volume of the system citywide. If so, doesn't that contradict the premise of the FDD program--which is to reduce sewer backups and avoid overflows into the Huron? 

 

A.51., CAC October meeting. There is not an “ideal” control meter on a small upstream neighborhood without FDDs. However, the wastewater treatment plant (WWTP) is working as a suitable control district with some limitations. The limitations include changes in the system over the last 13 years such as new development (baseflow), and the fact that the flows at the WWTP may have decreased slightly themselves as a result of FDD.  Because houses with FDD comprise only about 5% of the total houses in the City, the WWTP is functioning as a suitable control, despite these limitations. It should be noted that a decrease in flows at the WWTP as a result of FDD would tend to result in the underestimation of FDD flow removals in the priority neighborhoods, when the WWTP is used as a control.

Frank Burdick Sat, 22 Feb at 1:24pm | Edit (for another 12 minutes)

It the wwtp is used as the only real "control" for the sanitary system at large:

1. What impact has the recent / on going snow melt had on the flow to the wwtp especially regarding man hole pick holes,etc  I/I and other non-FDD sources of flow?

2. What can the FDD CAC / CDM tell us at to he frequency of discharges of the existing FDD sump pumps during this latest period?

The purpose of this inquiry is to help narrow down the impact of  non-sump related i/i.  That is if the sump pumps are not running that frequently during this recent "melt" because of the extreme frozen ground still, is it likely that much of the I/I  ( please forgive my all caps here!) currently flowing to the WWTP, can be quantified as non fdd I/I?