2018 NHEC - NATIONAL HYDRAULIC ENGINEERING CONFERENCE
Advancing Hydraulic Engineering through Innovation and Resilient Design
Wednesday, August 29, 2018
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TITLE:
Computation of Hydraulic Jump's Sequent Depth in Sloped Circular Water Pipe
AUTHOR:
Kenneth B. Edwards, LMNO Engineering, Research, and Software, Ltd.
ABSTRACT:
Hydraulic Engineering Circular No. 22 (HEC-22) contains the FHWA's guidelines and recommended design procedures, which are widely used in design of roadway drainage. HEC-22 proposes a set of equations for the design of curb inlets; however it does not mention the source or the assumptions behind these equations. In this study, the theoretical basis of these equations is presented and the underlying assumptions were critically examined. In the case of undepressed inlets, data from previous studies showed that HEC-22 accurately predicts the 100% interception for flat cross-sectional slopes and underestimates the inlet’s performance for steep cross-sectional slopes. For depressed inlets, full-scale tests showed that HEC-22 significantly overestimates the interception capacity of long inlets (greater than 5 ft). Modifications are proposed to HEC-22, which show good agreement with results from earlier studies. Finally, full interception of incoming flow is seldom achieved for depressed and undepressed inlets on a road with both a steep grade (greater than 3%) and a flat cross-sectional slope (less than 3%). Designers are advised to use a different type of storm drain inlet for this condition or take into account the substantial degradation in the performance of the curb inlet.
BIOGRAPHY: Kenneth Edwards
Ken Edwards is a Professional Engineer in Ohio and holds a Ph.D. from Iowa State University in civil engineering. He and his wife, Debbie, who is also an author of this paper, are co-owners of LMNO Engineering, Research, and Software. LMNO Engineering is a consulting and software development company in Athens, Ohio, focusing on fluid dynamics, hydraulics, and hydrology. Prior to forming LMNO Engineering in 1998, Ken was a faculty member in civil engineering at Ohio University in Athens.
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The Russ College of Engineering and Technology at Ohio University, in cooperation with The Ohio Department of Transportation, is proud to have hosted the 2018 National Hydraulic Engineering Conference (NHEC), on August 28-31, at the Hyatt Regency in Columbus, Ohio. Themed “Advancing Hydraulic Engineering through Innovation and Resilient Design,” the ninth biennial conference addressed the challenges that transportation agencies face to construct, maintain, sustain, and improve hydraulic structures in the physical, natural, social, and economic environments of today and tomorrow.
Presentation topics included stream stability, water quality, stormwater management, climate change, scour, modeling, and related areas. The conference also featured demonstrations, field trips, and short courses for surface transportation officials, including hydraulic engineers, environmental engineers, National Pollutant Discharge Elimination System (NPDES) specialists, roadway designers, and other professionals.
