REQUEST FOR DIRECTION
DATE: September 18, 2017 Report No. EPW-17-046
TO: Laurie Hurst, Chief Administrative Officer
FROM: Jeff Miller, Director of Engineering and Public Works
SUBJECT:
Title
Inflow and Infiltration Strategy
End
ESSENTIAL QUESTION:
How will inflow and infiltration activities that occur in the public and private realms be funded?
RECOMMENDATION:
Recommendation
That the Committee of the Whole receive Staff Report EPW-17-046 for information, provide any additional direction to staff as the COTW considers advisable, and directs staff to prepare a report for Council's consideration.
Body
BACKGROUND:
Inflow and infiltration (I&I) is the flow of storm water or ground water that enters the sanitary collection system. See Attachment 1 for definitions. From 2005 to 2015, the Township has carried out a number of activities to reduce the flows created by I&I within the public realm. See attachment 2. Theses activities were undertaken to meet requirements under the Liquid Waste Management Plan. These are:
1. Reduce the maximum daily wet weather flows to less than 4 times the average dry weather flow (4xADWF) by 2030.
2. Eliminate overflows less than a 5 year return period.
The activities that have been carried out have impacted the volume of I&I that enters the sanitary collection system. See Attachment 3. However to continue this trend, activities would need to shift from the public realm to the private realm due to the length of pipe and contribution of the private realm. See Attachment 4.
When a typical neighbourhood is reviewed, there are generally three situations that will appear. These are:
1. The existing storm drain does not extend the entire length of the road. In this situation, roof drains and weeping tile has been tied into the sanitary service line.
2. Storm and sanitary service laterals have been cross connected to each other.
3. The sanitary lateral is connected to the sanitary collection system but is failing.
ISSUES...
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