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mburrell

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About mburrell

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  1. By the way - a couple other important points to this topic that others might find useful: 1. When we were running WMS on a 10 metre pixel DEM there were NONE of these issues. Culverts, flow patterns and drainages all came out exactly as expected. It wasn't until we tried to refine the data by tightening up the resolution that the problems appeared. 2. When I used the ArcGIS Hydrology toolset to derive the Flow Direction and Accumulation surfaces there were no problems with the result at either 2m or 10m. The flow went through at culverts just the way you would expect... and orig
  2. Hi, Just reporting back on my flow pattern issue. Editing the DEM as described worked perfectly, transferring the water across the road, but in the end I had to come at the problem a different way. Cody's method was convenient and straightforward but in my dataset I just had too many 'misdirections' to make it feasible. Instead I experimented with widening the gap in my roads. Initially the culvert location was a single pixel hole in the road's berm. I created a depression around this gap (trying various diameters up to 22 metres wide) to pull the water toward the culvert, it
  3. Thanks guys. Very useful; I'll give those ideas a try and report back. It was a fine balance with the LiDAR DEM when I originally exported to ASCII for WMS. I didn't want to make the culvert 'holes' through roads too large or they would start impacting the surrounding terrain unrealistically. My basic process was to run raster math on the original DEM. As mentioned it was a 2m dataset. First, I made the roads 10m tall to ensure they were a barrier, then cut 2m holes in them where each culvert was situated. Then I tried both a 5m buffer depression and a 10m buffer depression s
  4. Hello, I'm a GIS Tech and have been tasked with producing a number of hydrographs for some culvert installations within a forested water supply catchment. I'm using a 2m LiDAR DEM (converted to ASCII for import) and for the most part the TOPAZ-derived drainage network is representational of reality in the field. For those areas where WMS is sending the drainage down an incorrect path I need to make adjustments to both the drainage and its associated basin. I can't figure out how to do this!! I saw the tutorial video on how to divert runoff along a topographic barrier (the example
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