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Hydraulic efficiency of grate and curb inlets for urban storm drainage

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dc.contributor.authorComport, Brendan, author
dc.contributor.authorThornton, Christopher, advisor
dc.contributor.authorKampf, Stephanie, committee member
dc.contributor.authorRoesner, Larry, committee member
dc.date.accessioned2022-04-15T15:26:03Z
dc.date.available2022-04-15T15:26:03Z
dc.date.issued2010
dc.descriptionCovers not scanned.
dc.descriptionPrint version deaccessioned 2022.
dc.description.abstractStormwater runoff from an urban landscape is typically conveyed through networks comprised of streets, gutters, inlets, storm sewer pipes, and treatment facilities. Objectives of this research program included evaluating the hydraulic efficiency of three storm-drain inlet types and developing design methodology. Denver Type 13 and 16 grate inlets and Colorado Department of Transportation Type R curb inlet were evaluated during the course of testing. Grate inlets were tested in a grate-only and combination inlet configuration. A one-third Froude scale model was constructed to permit testing longitudinal slopes from 0.5 to 4 %, cross slopes from 1 to 2 %, prototype depths from 0.333 to 1 ft, and prototype inlet lengths from 3.3 to 15 ft. A total of 318 tests were performed for the various configurations. Inlets tested are currently used by the Urban Drainage and Flood Control District (UDFCD), and have never been tested or studied in a manner such that an efficiency relationship is known. Efficiency is defined in this study as the percentage of total street flow removed by an inlet design. Current design practices are typically based upon “Hydraulic Engineering Circular 22” (HEC 22), which addresses the use of other inlet types, but it does not provide guidance specific to the three inlets tested. Need for this study arose from general uncertainty in matching inlets used by the UDFCD to methods presented in HEC 22. This uncertainty in design relates to sizing inlets and in determining the level of flood protection afforded by their use. After examining the collected test data, dimensional analysis was conducted on influencing variables and regression techniques were used to develop new equations for prediction of inlet efficiency. In addition, HEC 22 methods were modified to include the three inlets tested. Street flow was observed to be often supercritical and non-uniform, with efficiency highly dependent upon flow velocity and inlet length. For a given inlet length, the combination inlets were found to perform most efficiently. Inlet efficiencies computed from the developed empirical equations and modified HEC 22 methods were compared to the collected test data and current HEC 22 methods. When compared to prototype data for typical design flow depths of 0.5 to 1 ft, the empirical equations showed accuracy to within 9% efficiency error for the combination inlets which is a 30% improvement over current HEC 22 methods. All methods for the type R inlet showed similar results at 0.5 and 1 ft depths, with differences up to 15 % occurring at the lowest depth of 0.333 ft. Furthermore, details of the testing and analysis were presented and suggestions for further research were made.
dc.format.mediummasters theses
dc.identifier.urihttps://hdl.handle.net/10217/234710
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relationCatalog record number (MMS ID): 991014244609703361
dc.relationTE215 .C655 2010
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectRoad drainage
dc.subjectStorm sewers
dc.subjectUrban runoff
dc.titleHydraulic efficiency of grate and curb inlets for urban storm drainage
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineCivil and Environmental Engineering
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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