AmericaNYStateHydrologyHydraulicsBridgeDesignHandouts1.pdf

Bridge Hydraulics Overview Hydrology & Hydraulics for Objectives for this presentation: Bridge Design 1 – Design discharges (Hydrology) 2 – Channel & Bridge Characteristics 33 – HHyddraulilic AAnallysiis usiing HECHEC-RASRAS -- A brief overview BRIDGES OVER WATERWAYS Bridge Design Objectives BRIDGE DESIGN CRITERIA: • Provide for the safe traveling of the • Bridges should be able pass the 50 year public across a waterway storm with 2 feet of freeboard and some lesserlesser freeboardfreeboard forfor thethe 100100 yearyear stormstorm. • Allowing for conveyance of storm • There should be no impact to the discharges through the structure upstream water surface elevation and/or without adversely impacting the floodway and floodplain widths. traveling public, damage to properties • Bridges should be able to withstand scour and the environment. during a 500 year storm event. SIZING A BRIDGE WATERWAY SIZING A BRIDGE WATERWAY OPENING