Occasionally it is necessary to layout cross sections in a curved or dog‑leg alignment to meet this requirement. The cross sections should extend across the entire floodplain and should be perpendicular to the anticipated flow lines. Cross sections are located at intervals along a stream to characterize the flow carrying capability of the stream and the adjacent floodplain. This article discusses the requirements for HEC‑RAS cross section placement, spacing, layout, geometry, and other data.īoundary geometry for the HEC‑RAS analysis of flow in natural streams is specified in terms of ground surface cross sections and the measured flow distances between them (reach lengths).
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