Sewer Flow Reductions - 2006

Good News Message on Corunna sewer flows!

To:     Joe Sawyer, City Manager
          City of Corunna

From:   Gary Arnold, P.E.        
            Capital Consultants - Design Works A/E 

Date:   January 5, 2007
Re:  2006 WWTP Flows

Message: 

I received the email from Gary Burk with the 2006 WWTP flow data and used the data to create the following interesting comparisons. I have attached a copy of our analysis of the historical flow data for your records.

Annual precipitation in 2006 was up 42% over 2005. Correspondingly, the average day wastewater flows for the constituent communities reflected the higher precipitation as follows:

• The City of Owosso – up 12.6% over 2005 flows
• Owosso Township – up 20.67% over 2005 flows
• Caledonia Township – up 10.38% over 2005 flows
• The City of Corunna – up 11.30% over 2005 flows

Comparing average day flows for 2006 (with 40.64 inches annual precipitation) and 2004 average day flows (38.47 inches annual precipitation), the following is noted:

• The City of Owosso – down 0.13% over 2004 flows
• Owosso Township – up 19.00% over 2004 flows
• Caledonia Township – up 6.40% over 2004 flows
• The City of Corunna – down 10.44% over 2004 flows

Although not definitive, the data indicates that the recently completed sewer lining and extraneous lead removal program has had a significant positive impact, reducing the level of infiltration and inflow entering the City sewer system.
Once the Ferry Street pump station construction is completed and online (February 2007), we will be able to further evaluate the effectiveness of the initial sewer rehabilitation program. 

View the report below for a flow summary (in PDF format).