Welland initiates investigation of Dain City inflow and infiltration

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Ontario Construction News staff writer

In response to resent flooding in the Dain City neighborhood, the City of Welland has introduced several initiatives to better understand the causes of flooding and to develop implementable solutions to reduce the risk of future flooding.

The plan is to locate and address sources of high Inflow and Infiltration, and further create a plan to mitigate issues to reduce stress on the wastewater systems, and reduce the volume of wastewater that Niagara Region treats.

Over the next few months, thorough investigations will take place in the affected Dain City areas to ultimately create and execute a Dain City Inflow and Infiltration Investigation and Remediation Action Plan.

City staff and GM BluePlan are working on the following tasks this fall 2020:

  • Public outreach and resident feedback
  • CCTV sewer inspection
  • Sanitary sewer flow monitoring
  • Curbside property and neighbourhood survey
  • Fog and dye testing

The city has retained the engineering firm GM BluePlan Engineering Limited to conduct a comprehensive research strategy that includes on-site work exploration and a data collection survey for people who have been affected by basement or property flooding.

The investigation will identify unwanted sources of I&I (infiltration and inflow) entering into the city’s wastewater collection system, the city says in a statement All residents in the I&I investigation areas will receive a letter of notification via mail if or when this procedure will occur. A thorough investigation will help develop appropriate and realistic remediation strategies to reducing and eliminate sources of I&I entering the system.

Fog and dye testing: Fog and Dye testing might be conducted in the affected Dain City areas. All residents in the Fog and Dye testing areas will receive a letter of notification in the main if or when this procedure will occur.

What is fog testing? The fog test consists of blowing a harmless coloured vapour into the sewer manholes and pipes and observing where the fog exits from the system. The fog is expected to exit primarily out of manholes on the street and the sewer plumbing stack at the top of your house. It is also possible for fog to exit stormwater catch basins and roof downspouts at the side of a house. The fog used in the test has no odour, isn’t harmful to your health, and will disappear after a few minutes.

City staff expect a detailed DCII&RAP report completed and presented to council in December.

“Being active and on-site in Dain City is essential to finding the sources of high Inflow and Infiltration, so we can learn more about this neighbourhood’s drainage issues to build a clear strategy plan,” said Marvin Ingebrigtsen, infrastructure planning and asset management supervisor.

“Our goal is to reduce stress on the wastewater systems through a reduction in stormwater entering the wastewater system.”


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