McGarry, Tim

Tim McGarry is with SewerAI.

Titles from this speaker

Description: Accuracy and Project Cost Comparison Between Photogrammetry and LiDAR-based Methods...

Accuracy and Project Cost Comparison Between Photogrammetry and LiDAR-based Methods in Sewer Manhole Inspection Data Capture and Condition Assessment

Abstract

Sewer infrastructure management is on the verge of significant transformation driven by advancements in cloud computing, photogrammetry, and availability of high-resolution 360 'Action Cameras'. This presentation takes a critical look at this innovative approach, which uses data captured with consumer-available 360 'Action Cameras' to convert manhole inspection videos into intricate, textured 3D models of sewer systems. Notably, this session will feature a comprehensive objective comparison of field data accuracy, production/efficiency, limitations, and lessons learned. At the core of this approach lies photogrammetry, a sophisticated mathematical method that translates digital pixels in inspection videos into precise 3D points. Within the rendered 3D models, users can swiftly assess sewer components, perform custom measurements with centimeter-level accuracy, and can export this data into popular CAD software, for additional uses. The presentation explores how this new approach addresses longstanding challenges utilities have faced in sewer manhole assessment. Central to this discussion is a deep dive into the objective comparison of field data accuracy and field production and efficiency when contrasted with legacy manhole scanning systems. We will explore real-world scenarios and outcomes on projects in Houston, TX; Los Angeles, CA; Alexandria, VA; Toronto, ON; and other North American locations, shedding light on the practical implications of this technology. In addition, new cloud-based workflows for data capture, data transfer, stakeholder alert/review, and final submittal will also be described and compared to traditional methods of on-premises and physical data transfer. Furthermore, this presentation will scrutinize the limitations of this approach and draw a comprehensive comparison between photogrammetry and LiDAR, two prevalent methods in the industry. As we peer into the future of sewer infrastructure management, this session promises to provide valuable insights, backed by empirical data, and aims to foster an informed discussion about newly available options for sewer utilities, services contractors, and civil engineers. The presentation will conclude with summaries of known use-cases, as well as future use-cases and capabilities enabled by current technologies, such as Digital Twins and 3D modeling of horizontal sewer structures. Join us in this pivotal exploration of advancements that are shaping the future of sewer infrastructure management.

This paper was presented at the WEF Collection Systems and Stormwater Conference, April 9-12, 2024.

SpeakerMcGarry, Tim

Presentation time

10:45:00

11:15:00

Session time

08:30:00

11:45:00

SessionCollection System Inspection

Session number28

Session locationConnecticut Convention Center, Hartford, Connecticut

TopicCoastal Systems, Collection Systems, Condition Assessment, Consent Orders, Construction, Design considerations, Flow control, Force Mains, Infiltration/Inflow, Innovative Technology, LiDAR surveying, Pipe, Pipe Failures, Real Time Decision Support System, Real-Time Control, Rehabilitation, Slip line, Utility Management, Wastewater Management

Author(s)

Sullivan, Eric

Author(s)E. Sullivan1, T. McGarry1

Author affiliation(s)SewerAI 1

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Apr 2024

DOI10.2175/193864718825159365

Volume / Issue

Content sourceCollection Systems and Stormwater Conference

Word count20

The Amazing AI Race: Pit Stops, Detours, and Green Flags

Abstract

Across North America, the National Association of Sewer Service Companies (NASSCO) has pioneered the development of a standardized observation and defect coding system for underground infrastructure systems. Using NASSCO's the Pipeline Assessment and Certification Program (PACP), inspections can be evaluated in a consistent and defensible manner. Standardization serves as a cornerstone for establishing benchmarks and comprehensive guidelines for assessing pipe's current condition and tracking deterioration over time. Using PACP, allows owners, engineers, and operators to discuss pipe condition using the same language, which minimizes the risk of misinterpretation. In keeping with the broader trend seen in many industries, gravity sewer condition assessment has seen advancements with artificial intelligence (AI) coding. While NASSCO's coding system provides consistent guidelines for certified professionals to use, it doesn't account for experience level and bias. These factors can attribute to missed or improperly documented defects. However, AI technology is not intended to completely replace human interaction with closed circuit television (CCTV) and condition assessment. The goal would be to help employees work more efficiently, allow utilities to better allocate resources, and to produce more consistent condition assessment results to help track pipe deterioration over time. The extent to which AI can impact a sewer maintenance program depends on the unique goals and structure of each utility. Some utilities have an abundance of CCTV comprising information from various sources. This data can be from historical inspections that don't meet NASSCO standards, new construction acceptance assessments, cross-bore investigations, or routine inspections done in house or by a contractor. AI can be used to bring historical data up to date with modern coding standards quickly and effectively. For utilities facing staffing constraints, they can utilize AI to process and code videos to be flagged for emergency repairs, cleaning issues, or long-term construction planning. For more robust utilities with capital improvement programs, AI can help streamline processes and help drive decision making tools. Ultimately, AI can upgrade a utility's potentially underutilized data into a wealth of knowledge for stakeholders. For one case study, AI was introduced into a robust program. Historically, CCTV data was collected and coded in the field by operators. Office staff would review all the codes for accuracy and update accordingly. The codes were then processed through an algorithm to produce rehabilitation, replace, or repair (3R) recommendations and estimated costs for repairs. As a potential cost and time saving measure, AI was introduced between when the data is recorded and when the data is coded. The utility contractors will submit uncoded data to the AI and the AI will process the videos and provide PACP codes. Compared to historically coding review, there was an 80% reduction in review effort required by office staff. The AI generated codes are still run through the same 3R algorithm and costs are produced. When comparing human coding to AI coding, two key points stood out. AI detected more structural codes than a human coder, and according to the 3R algorithm, those codes in general were higher risk and indicated a more robust repair. A more detailed condition assessment must be accounted for in future budgeting as the utility considers adopting AI. While there are significant costs savings during data collection and processing, more capital funds are potentially required for system improvements. Modifying the 3R algorithm can help to accommodate for those increased costs, but there can be downsides to changing the algorithm. Another case study introduced AI in part to keep up with the amount of 360 data they are collected via an untethered large diameter floating camera. This data is collected with basic header information and was previously left for engineers to process. The goal for the AI is to code these inspections so that the engineers can prioritize which inspections they are reviewing based on structural or operation and maintenance (O&M) codes the AI adds. Utilizing AI in this way allows the utility to effectively allocate staff hours to the most at risk pipes. However, AI is not the 'easy' button the industry might be searching for. There are hurdles to implementing an AI can include initial investment costs (licensing cost, staff training, and required software), planning efforts, data management, and data quality. Like any new tool, adding an AI to a program requires some monetary investment. Understanding the extent to which an AI will be used can help build justification for the initial investment. Aside from the direct costs for a new tool, there will be costs associated with planning and changing business processes for implementing AI. Utilities will have to decide at what part of their process the AI will replace/supplement and what parts of the downstream process will change with the new outcomes from AI. Documented workflows are beneficial for understanding the current level of effort for staff and where a tool like AI can fit best to amplify the process from field collection to renewal/monitoring. For data management, the AI acts as a source for data to live and be processed. There is still a requirement that a utility staff or consultant, manages what data is submitted to and processed by AI. For data quality, AI is a tool that is taught the PACP standards and will improve more and more overtime. AI still requires some human quality control but will still significantly reduce hands on review. When introducing AI as a new part of any company, there can be some hesitation from staff around job security. Its vital to a successful implementation to clearly explain the intent and extent of the AI to all team members. Transparency during a transition like this can help encourage a culture shift that would see AI as a supportive tool rather than job replacement measures. The integration of AI into a sewer maintenance program represents a drive towards more effective and efficient infrastructure management. AI can continue to grow and complement the efforts by NASSCO to standardize condition assessment efforts in the industry. The success of AI depends on the specific objective of each utility, but helps pave the way for a more robust, data-driven, forward-thinking approach to sewer systems.

This paper was presented at the WEF Collection Systems and Stormwater Conference, April 9-12, 2024.

SpeakerAlexander, Kelly

Presentation time

10:45:00

11:15:00

Session time

10:15:00

11:45:00

SessionAlternate Design Tools

Session number29

Session locationConnecticut Convention Center, Hartford, Connecticut