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What is I&I?
Infiltration and Inflow (I&I) is clean storm and/or groundwater that enters the sanitary sewer system through holes, breaks, joint failures, connection failures, illegal connections (sump pumps, down spouts/gutters, and footing drains), and from cross-connections with storm sewers. Most inflow comes from stormwater and most infiltration comes from groundwater. High groundwater levels and storm events can contribute to excessive sewer flows.
I&I affects the volume of flow conveyed through the system and pumping stations and the cost to treat the flows. Ultimately, this affects the taxes businesses and residents pay to operate and maintain the sewers. Private property I&I can contribute substantially to the problem. An 8-inch diameter sewer can adequately convey flow from roughly 200 homes. However, only 8 sump pumps operating at full capacity can overload the same 8-inch diameter sewer.
The Town of Amherst Engineering Department maintains a proactive approach to sanitary sewer maintenance which includes sewerline flushing, root treatment, manhole inspection and GPS. To minimize and eliminate extraneous stormwater from entering the sanitary sewer system a townwide program is currently being utilized. Some of the investigative techniques are used to identify sources of I&I include the following:
- Flow Monitoring
- Determines the amount of I&I entering a sanitary sewer system. Sensors are placed into the flow and the data is analyzed to determine if more investigation is required in the study area.
- Smoke Testing
- Identifies connected downspouts and other inflow sources, such as cross connections with the storm sewer system and deficiencies in and around manholes and sewers. The testing involves placing a blower over a manhole to push a non-toxic, odorless “smoke” into the sewerline and laterals.
- Televising and Dye Testing
- a non-toxic dye is added to a possible I&I source like storm drains and ditches. The sewerline is then televised, using a camera to look for cracks, root intrusions, and dye colored infiltration. The video from the camera also serves as a condition assessment for the sewers to determine locations for repairs and rehabilitation projects.
- Time of Sale Inspections
- Includes interior and exterior plumbing inspections to help property owners eliminate illegal or improper stormwater connections like sump pumps, roof drains and more. For more information see the Time of Sale Law webpage.
- I&I Reduction Program
- Private developers are required to offset peak flows from their proposed projects on a 4:1 ratio. For an explanation of the program see the Sewer Remediation Trust Fund. This program requires that developers calculate the peak sewage flow for the their project and then multiply the peak sewage flow by the 4:1 ratio of required mitigation flow to peak sewage flow to determine the flow that must be mitigated by the proposed project.Forinformationregarding the acceptable mitigation measures and costs of mitigation credits, please see the Town of Amherst I&I Table.
Once I&I sources are identified, several repair and rehabilitation methods are used, including replacement, spot repair, and manhole repair. Trenchless Technologies are also being used, including PipePatch and Cured-In-Place Pipe (CIPP) Lining to help the town rehabilitate the sewer infrastructure.
Engineering Department
1100 N Forest Rd
Williamsville,
NY
14221
(716)
631-7154
8:00 AM - 4:00 PM (Mon-Fri)
Engineering Department
Engineering Support Division
Sewer Maintenance Division
Water Pollution Control Division
Environmental Control
Engineering Services Division
Armstrong, Brian
Director of Engineering Services
716-631-7154 ext.
7412
Boudreau, Jessica
Project Manager
716-631-7154 ext.
7427
Hitzel, Michael
Architect
716-631-7154 ext.
7069
Pontikos, Asher
GIS Analyst
716-631-7154 ext.
7415
Schregel, Chris
Project Manager
716-631-7154 ext.
7416
Sewer Maintenance Division
Reberholt, Vaishali
Assistant Town Engineer
716-631-7154 ext.
7421
Burow, Sarah
Senior Engineer Assistant
716-631-7154
Goldstein, Noemi
Messenger
716-631-7154 ext.
7422
Princess, Brian
General Crew Chief
716-631-7154 ext.
7434
Wastewater Treatment Facility
Colter, Quinton
Pretreatment Coordinator
716-691-9771 ext.
8028
Burroughs, Jeffrey
Town Engineer
716-631-7154 ext.
7418
Suszynski, Jerome
Assistant Plant Superintendent
716-691-9771 ext.
8036
Abramo, Joe
Electronics Technician
Barnes, Brian
Senior GIS Analyst
716-631-7154 ext.
7069
Berger, Corey
Senior Electrician
Dean, W. Tom
Purchasing Agent
716-691-9771 ext.
8041
Hoose, Richard
Electronics Technician
Poslinski, Michael
Senior Engineer Assistant
716-691-9771 ext.
8045
Process Control
Process Control
716-691-9771 ext.
8015
Rink, Richard
Project Manager
Russell, Crystal
Accounts Payable
716-691-9771 ext.
8010
Struzik, Gregory
Network Coordinator
716-691-4331 ext.
8025
Tirone, Mark
Chief Wastewater Treatment Plant Operator
716-691-9771 ext.
8017
Vaillancourt, Andrew
Senior Electrician
716-691-9771 ext.
8053
Citizen’s Guide to Identifying and Preventing Stormwater Pollution
The Town of Amherst is a MS4 Community and together with the Western New York Stormwater Coalition, Amherst is providing this Citizen’s Guide to help identify and prevent stormwater pollution. Please see the attached document for helpful tips on understanding illicit discharges and things you can do to protect water quality. For questions or to report an issue, email sburow@amherst.ny.us. Thank you for doing your part to keep our water clean!
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