Assessing Rehabilitation Techniques Through Hydraulic Modeling

Assessing Rehabilitation Techniques Through Hydraulic ModelingAbstractPurpose Collection system modeling is traditionally completed to assess network condition, achieve infiltration and inflow (I/I) removal, evaluate alternatives, and to develop source reduction programs (SRPs). Eight SRPs were developed for the Kline's Island Sewer System (KISS) to assess the impact of different I/I elimination strategies, and each was incorporated into a scenario of the hydrological/hydraulic model by adjusting the contributing runoff surface values and base infiltration accordingly. I/I reductions were derived from a compendium of rehabilitation effectiveness studies and performance metrics collected over the last 20 years that classified a diverse range of rehabilitation techniques (nearly 30) by effectiveness reduction percentage for the four contributing runoff surfaces. Benefits of Presentation This is a novel method for modeling the impacts of manhole, main, tap, riser, lateral, and private-side sewer rehabilitation techniques. This presentation is relevant to programs that use modeling to assess impact of rehabilitation techniques on sewer baseline infiltration and peak wet weather flows. This method allows for countless rehabilitation strategies to be applied to a model and further evaluated, especially if meaningful assessment of the underlying flow data are also conducted to identify the most effective technique to apply on a catchment by catchment basis. This provides insight on how to develop a catchment-tailored SRP that optimizes cost and I/I reduction, including the ability to differentiate between inflow and rainfall induced infiltration, thereby reducing capital expansion projects. Status of Completion The project team successfully used this modeling method to create eight unique SRPs, utilizing various types and amounts of rehabilitation techniques. These were applied to over 40 modeled alternatives followed by costing exercises to quantify the capital, operating, and replacement life cycle cost of each alternative with the respective SRP applied. The final alternatives provided options that leveraged the benefits of rehabilitation in order to eliminate nine large capital expansion projects. Conclusion The final alternatives provided options that leveraged the benefits of rehabilitation in order to eliminate nine large capital expansion projects.This paper was presented at the WEF Collection Systems and Stormwater Conference, April 9-12, 2024.SpeakerManzano, JuliaPresentation time08:30:0009:00:00Session time08:30:0011:45:00SessionModelingSession number25Session locationConnecticut Convention Center, Hartford, ConnecticutTopic2-D Modeling, Collaboration, Collection Systems, Construction, Design considerations, Flooding, Hydraulics, Hydrology & Hydraulics, Infiltration/Inflow, Modeling, Rehabilitation, Stormwater Management Design And Analysis, Wet WeatherTopic2-D Modeling, Collaboration, Collection Systems, Construction, Design considerations, Flooding, Hydraulics, Hydrology & Hydraulics, Infiltration/Inflow, Modeling, Rehabilitation, Stormwater Management Design And Analysis, Wet WeatherAuthor(s)Manzano, JuliaAuthor(s)J. Manzano1, J. Shelton1Author affiliation(s)Arcadis 1SourceProceedings of the Water Environment FederationDocument typeConference PaperPublisherWater Environment FederationPrint publication date Apr 2024DOI10.2175/193864718825159334Volume / Issue Content sourceCollection Systems and Stormwater ConferenceCopyright2024Word count7