Live Webinar Series

Infiltration and Inflow Measurement and Methods

Part 5 – Wet Weather Analysis: Setting Up the Work
Thursday, June 24, 2021 @ 12N EDT, 11am CDT, 10am MDT, 9am PDT
Have an infiltration and inflow (I/I) problem? You are not alone. Most wastewater collection systems do, and an I/I study is often the first place to start. Join ADS for a six-part webinar series taught by experienced professionals where you will learn how to plan and execute successful I/I studies. The first two webinars will focus on planning, mobilization, and monitoring, while the following four webinars will discuss evaluation methods used to characterize rainfall events and understand dry weather and wet weather sewer performance. I/I studies are fundamental to the success of subsequent condition assessment and rehabilitation programs. Learn here to plan and execute them with confidence to guide and assess the programs that follow.

Duration: 50 minutes with up to 10 minutes of Q&A to follow

The success of a rainfall-dependent inflow and infiltration (RDII) project strongly depends on project planning and execution. This webinar will define the several steps necessary to produce a useful analysis that can determine where RDII is originating and the severity of RDII throughout the study area. Key items to consider include, basin size, determining sewershed boundaries, Gross and Net RDII hydrographs and precompensation of base infiltration. We will discuss the 14 historical methods for quantifying and normalizing RDII values and recommended method(s) for normalizing RDII. Will also discuss the use of Seasons and the number of storms to be included in a study.
Speaker: Patrick Stevens, P.E.

Patrick is Vice President of Engineering at ADS Environmental Services with over 50 years of experience in wastewater engineering with a wide perspective as a municipal engineer, consulting engineering, and regulator. He holds a Bachelor of Science in Aeronautical Engineering and a Master of Science in Environmental Engineering from Purdue University. He is a 2019 Water Environment Federation Fellow.

Did You Miss Previous Webinars?
May 27, 2021
To understand the wet weather performance of your sewers, you first have to understand how they perform during dry weather conditions. This webinar will define a “dry day” in the context of I/I studies and show how to extract this information from study data. Key performance indicators (KPIs) include minimum, average, and maximum dry weather flow rates, as well as estimates of wastewater production and groundwater infiltration. Four methods of estimating groundwater infiltration will be discussed, including the % Minimum Method, the Wastewater Production Method, the Stevens-Schutzbach Method, and the Mitchell Method. Once KPIs are obtained, they can be used to benchmark performance against a variety of sewer design guidelines.
April 22, 2021
Following successful planning, mobilization, and monitoring, I/I can be evaluated to target the most problematic areas of the wastewater collection system for further investigation, inspection, and rehabilitation. The first step is to evaluate rainfall data obtained during the monitoring period. This webinar will discuss the definition of a rainfall event and the characteristics of rainfall events most important to I/I evaluation. Comparing rainfall events to rainfall depth-duration-frequency (DDF) and intensity-duration-frequency (IDF) data will also be discussed, along with spatial distribution methods available to extrapolate point-source rainfall measurements to areal rainfall estimates associated with the study area.
March 25, 2021
Following the initial planning for an I/I study, it is time to deploy flow monitors and rainfall monitors and gather crucial data needed for successful evaluation. Part 2 of this webinar series is a panel discussion that provides important insight on what to do and what not to do in this critical phase. Panelists include ADS project managers and engineers who understand the administration, management, and technical aspects of I/I studies and have a broad range of experience on projects throughout the United States and Canada.
February 25, 2021
Part 1 provides a framework to help you plan for a successful I/I study.  One of the most important planning objectives is to estimate the scope, schedule, and budget for the monitoring phase, which requires that several questions be asked and answered.  How many flow monitors are needed?  How many rainfall monitors are needed?  When should I start monitoring?  How long should I monitor?  We will discuss the technical implications of these questions and how they influence the success or failure of an I/I study.  Applying the principles here will allow you to position your next I/I study for success.
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ADS Webinar for Elements to Successful Rainfall Monitoring Part 01

SPEAKER: Kevin Enfinger, P.E.
Important engineering decisions are made every day regarding sanitary sewer, combined sewer, and storm sewer systems and often require the use of rainfall data. See how selecting the right equipment in the right quantities for your local rainfall conditions and your specific applications will lead to a successful rainfall monitoring program.

SLiiCER - I/I Analytics for the Next Generation
SPEAKER: Kevin Enfinger, P.E.   SLiiCER™ makes it easy to evaluate your entire collection system as a single solution, tracking down I/I to guide rehabilitation programs, eliminate overflows, and validate results.
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