City of Englewood Outfall Systems Plan Update, Oxford Pipeline Conditions Assessment, and Floodproofing Manual

 

The City of Englewood hired Calibre to model, identify, and mitigate flood hazard areas in an extremely flood prone area of the City. In July of 2018, three major basins in Englewood were impacted by 100-year flooding that caused unprecedented damage, including the collapse of a major roadway and a resident fatality. The main goal of this study is to provide Hydraulic & Hydrology (H&H) Modeling and 2D Modeling of the study area to identify expanded areas of probable flooding. In addition the project designs and prioritizes both short-term and long-term solutions to flooding, as well as to determine how to achieve the most flood hazard reduction with available city funds.   

 

In addition, Calibre provided a universal floodproofing study and research analysis to identify, analyze, and rank local and residential floodproofing techniques. This included review of the US Army Corps of Engineers’ manual titled: “The Floodproofing Technique, Programs, and References,” as well as USACE’s “Flood Proofing Regulations,” a half dozen FEMA resources, NOLA resources, and more than a dozen federal, public, and private agency resources. This manual will provide citizens with a go-to manual for residential floodproofing. 

 

The conditions assessment aspect of the project required Calibre to investigate the condition of an existing CMP and RCP stormwater pipe at Oxford and Santa Fe that has collapsed four times in the last five years, as well as to provide rehabilitation options and pricing. The portion of the system investigated includes pipe segments beginning at the South Platte River and extending to Rotolo Park. The alignment runs east from the river approximately 3,000 feet (ft) along W. Oxford Avenue to Navajo Street (Line 1), then turns south on Navajo Street for approximately 1,300 ft, then follows W. Quincy Avenue for approximately 250 ft, before entering an easement and running approximately 640 ft to a cul-de-sac in W. Radcliffe Drive. In total, we investigated 7944 LF of pipe ranging from 60” – 92” The assessment documented numerous pipe failures and blockage caused by debris. This included minor coating damage, joint failure, sedimentation, invert deterioration, asphalt debris, and other debris and build-up. Rehabilitation recommendations included pipe cleaning and removal of debris and sedimentation, acoustic assessment of soil instability, HDCCTV mapping, Phase II condition assessment, and pipe renewal of severe damage and deficiencies 

Outfall Systems Plan, Oxford Pipeline Assessment & Floodproofing, Englewood, CO

     

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