You need a terrain of your entire modeled area-including the stream channels. As great as LiDAR is for collecting surface data, conventional forms of LiDAR do not penetrate water.
This is a common problem as many sources of terrain data are collected today using LiDAR (Light Detection And Ranging). The problem is the area you want to model includes one or more rivers and streams that have no bathymetric (under water topography) data represented in the digital terrain model.
In other words, you want to lay out a grid, but do not want to have do to any 1D computations-all 2D. Let’s say you have a digital terrain model of the area you want to model with 2D HEC-RAS. Written by Christopher Goodell, P.E., D.WRE | WEST ConsultantsĬopyright © The RAS Solution 2014.
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