Live Webinar Series

Scattergraph Principles and Practice

How to Use the Scattergraph Poster – A Guided Tour

Thursday, November 04, 2021 at 12N EDT, 11am CDT, 10am MDT, 9am PDT
The scattergraph is a powerful tool that displays depth and velocity data from a sewer flow monitor, and the resulting patterns form characteristic signatures that provide insight into conditions within a sewer. Last year, ADS hosted a comprehensive webinar series designed to educate wastewater professionals to use scattergraphs to recognize various flow conditions in sewers and understand how they impact sewer capacity and performance. This webinar supplements that series with the release of the latest edition of our popular Scattergraph Principles and Practice Poster. Join Patrick Stevens and Kevin Enfinger as they demonstrate how to use the poster and provide a guided tour. This webinar is both informative and fun and will include tips and tricks, some hidden nuggets of wisdom, and a few behind-the-scenes stories.

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

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 Registered Professional Engineer in Indiana and Maryland and is a 2019 Water Environment Federation Fellow.

Speaker: Kevin Enfinger, P.E.

Kevin is a Product Manager at ADS Environmental Services with over 25 years of experience in environmental engineering and consulting. He holds a Bachelor of Science in Chemical Engineering from the University of Florida and is a Registered Professional Engineer in Alabama, Kentucky, North Carolina, South Carolina, Tennessee, and Texas. He is a member of the American Society of Civil Engineers and the Water Environment Federation.

Did You Miss the Previous Webinar Series?

Webinar Series: Infiltration and Inflow Measurement and Methods

August 19, 2021
Gauge-adjusted radar rainfall (GARR) is a powerful tool that combines rain gauge and radar data to produce high-quality, spatially distributed rainfall data used in I/I studies and hydraulic modeling. This webinar will provide an overview of GARR and discuss how to apply it. Planning considerations will be provided, as well as practical considerations needed for successful implementation and maximum benefit.
July 22, 2021
The key objective of an I/I study is establishing the relationship between the rainfall and the I/I that it generates; often called the Q vs i relationship. Each basin has its own relationship that varies with Winter and Summer seasons as well as with Wet Years and Dry Years. This relationship not only is an answer in I/I studies, but it is also a Key Performance Indicator (KPI) of how the work was conducted. We will discuss how the Q vs. i plot can be used to spot storms that were affected by snowmelt, high winds, base infiltration, restricted pipes, and sanitary sewer overflows (SSOs). Rainfall measurement is mathematically just as important as flow measurement, and rainfall measurement continues to be the greatest source of error/variation of results. We will discuss Control Basins and how they can overcome the vagaries of rainfall in assessing Pre- and Post-rehabilitation success.
June 24, 2021
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.
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.