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SR99 Bridge at Big Chico Creek, Chico, CA and Avenue 360 Culverts near Tulare, CA Dr. Lewandowski was project engineer for the hydraulic analysis of the existing and replacement bridges for this three span structure. A HEC-RAS model of the existing and two proposed bridge conditions was developed and used to estimate bridge soffit elevations.įirst Street Bridge Replacement, King City, CADr. FEMA floodplain boundaries were outside of the channel, with overland flow over the bridge approaches. Lewandowski was project engineer for the hydraulic analysis of the bridge. The HEC-RAS model included modifications to reflect existing conditions that were previously modeled incorrectly or for a new replacement bridge that had been constructed since the previous model had been developed.ĭr. Many of the bridge configurations in the previous HEC-2 model were updated in a new HEC-RAS model. Lewandowski was project manager for this study which included the analysis of thirteen bridges or large culverts along San Pablo and Wildcat Creeks.
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San Pablo Creek and Wildcat Creek Floodplain Assessment, San Pablo, CADr.
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Contraction scour was calculated using the HEC-18 methodology. A HEC-RAS model was developed for a multiple opening condition in the bridge. The crossing had three culverts, one super-span arch and two elliptical culverts, across a wide floodplain. Lewandowski was project manager for an analysis of the West Branch Alamo Creek crossing of Bollinger Canyon Road. A scour analysis was performed to determine the retaining wall footing elevation and scour protection measures.īollinger Canyon Road Bridge, San Ramon, CADr.
#Hec ras blogspot software#
This software allows the user to perform one-dimensional steady flow, one and two-dimensional unsteady flow calculations, sediment transport/mobile bed computations, and water temperature/water quality modeling. The widened roadway also requires a retaining wall to be constructed parallel to the edge of the creek. Welcome to the Hydrologic Engineering Center's (CEIWR-HEC) River Analysis System (HEC-RAS) website. A HEC-RAS hydraulic analysis was performed for the revised bridge crossing. The project is near the confluence of two creeks and required a bridge and scour analysis. Lewandowski was project engineer for an analysis of creek impacts from the Dublin Canyon Road widening project. A HEC-RAS model was developed for each bridge to determine the revised hydraulic and scour conditions.ĭublin Canyon Road Bridge Replacement, Pleasanton, CAĭr. Bridges over Cottonwood Creek and Elbow Creek were also analyzed. The pile caps and piles below the bridge were exposed due to past scour. Johns River had experienced long-term degradation, as well as contraction and pier scour. Lewandowski was the project manager for the hydraulic and scour analysis for the eight revised structures. The length of three existing bridges and five irrigation crossings of the highway must be increased as part of the project. Road 80 is a 15-mile length two-lane highway between the cities of Dinuba and Visalia, CA to be widened to four lanes, separated by a median.