HEC-RAS input
HEC-RAS input
(OP)
I hope you hydraulics experts out there can help out an ignorant structural/bridge engineer. It's a super long story so I'm not gonna explain why, but I need to know how much area upstream and downstream from a bridge needs to be surveyed for a proper hydraulic analysis. Due to issues beyond my control, the surveyors need to complete their work before the civil and geotechnical consultants will be selected, and I need to define their scope of work for contractual purposes. If it matters, the structural/bridge engineer (me) is the prime consultant on a State DOT / Federal Aid bridge rehab project.
Thanks in advance!
Thanks in advance!





RE: HEC-RAS input
good luck
RE: HEC-RAS input
RE: HEC-RAS input
there are existing hydraulic analysis for most rivers. A good place to to start would be to go ask the state or county or FEMA if any any studies have been done in the past. Then start with that study and determine any additional survey that is necessary. You will need to determine if the flow through the bridge is impacting any adjacent property owners so you may need to extend your survey at least to the upstream property lines. Many bridges are also checked against the 500-year flood so you would need to extend the cross sections widen enough to evaluate the 500-year floodplain.
RE: HEC-RAS input