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Hello, I have delineated watershed from DEM for some culverts. I would like to add the area of each watershed to its respective culvert and I would really appreciate any help I can get. The culverts are point shapefiles and the watershed are from the DEM. Since these are two different Layers, I am finding it hard to add the area drained by each culvert (which is in the DEM)to its respective culvert. I have 1435 culvert points shapefile and there are 1409 watershed areas I need to add to the culvert shapefile. Also, I have a land cover data classified into two classes (pervious and impervious) that I would like to add as another attribute of the culverts point shapefile. I would like to determine percent of watershed that is impervious as attributes of each culvert. Can anybody please give me clues as to how to proceed? Thank you.
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05-08-2014
01:41 PM
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Mark, I am trying to raise the roads. Since roads are barriers to flow, I am trying to raise it from the surrounding ground. I would want merged my roads with the DEMs so the road locations would have 3m more of elevation so that I will use this newly created DEM to generate watershed using road culverts as the pour points. I would want to know the catchment for each road culverts(s). Thanks.
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02-19-2014
02:22 PM
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I need help burning my roads data into my 3m resolution DEM to generate watershed. Any help? I have a roads dataset which I have already converted to raster with the same resolution as the DEM. I need to roads to burn into the DEM with the output being a new DEM so that I can use this to delineate watershed for road culverts. Can anybody please help? Thanks.
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02-19-2014
10:44 AM
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This will help you by checking your assumption that the watershed coming out of the processing is too big. Maybe its not. In the old days, watershed were delineated by hand using contour maps. A contour map of the area, however old, should be somewhat consistent with a modern day DEM. If I have a watershed that looks "wonky" I will use some other data source to check it against. Contours are a good start. The rules are that the watershed boundary must cross the contours perpendicularly. Flow direction is also perpendicular to the contours. If you have a GIS generated watershed, it should overlay on the contours (polylines or image) and the watershed boundary should cross the contours perpendicularly. If not, something is wrong. I suspect this is elementary to you. There are docs online that explain this. I've attached an image of a recent project I did with the watershed boundaries plotted over Topographic basemap layer from ESRI. Thank you very much for this I really appreciate it. Will keep you posted on things. Once again, thank you.
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12-20-2013
10:39 AM
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Can you please tell me how it will that help me delineating the water for the culverts?? Thanks
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12-20-2013
10:08 AM
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My study are covers 7 counties. I do not have a contour map map to compare my results to. You have any ideas in mind? Thanks
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12-20-2013
07:03 AM
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I am trying to delineate watershed for road culverts using the culverts as pour points. I have 3, 10 and 30 meter resolution DEMs which I downloaded from national map viewer for my study area. I snapped the pour points to specified distances; 10m distance for the 3m resolution DEM 20m distance for the 10m DEM, and 50m distance for the 30m resolution DEM. Can someone please help me how to get a reasonable catchment for each culvert? I am interested mainly in the little catchments that drain into a particular point(s). I have tried the usual ways of delineating watersheds; creating flow direction, flow accumulation and using the snapped points to generate to watershed using the watershed tool. My problem is some of the catchments are way toobig for just one culvert. Can someone please help me how I can do this? Thanks.
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12-19-2013
03:03 PM
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