The Arrowhead Sewershed includes the drainage area along South Franklin Street on the southern side of Interstate 81. This area was identified in a previous study as a major source of Inflow and Infiltration (I & I). Inflow is stormwater that enters sanitary sewer systems directly. Infiltration is groundwater that enters a sanitary sewer system through holes or leaks in sewer pipes.
Initial flow monitoring and model development indicates that the Arrowhead Sewershed has the highest normalized I & I of the entire sewer system. Additionally, this sewershed has the most potential for future growth so it is very important to fully understand the sources of I & I and the cost to reduce these peak wet weather flows.
This map shows where the study will be conducted.
The Sanitary Sewer Evaluation Study (SSES) and I & I Study included flow monitoring, sewer manhole inspections, sewer line CCTV, wet weather observations and smoke testing. The combination of these activities helped to determine the sources of I & I and identify corrective action the Town can perform to reduce these impacts.
Once the SSES was completed, the Town procured design services to prepare design drawings to address the I&I in the system. The engineer is currently preparing the project documents and the work will be bid to contractors in upcoming years.