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  • Users: Ravn
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  1. Ravn

    Flow path and catchment delineation with buildings

    Hello, I have some high quality DEM raster files from an urban area. I was thinking to delineate sub-catchment boundaries and flow paths with Arc Hydro Tools, but does anyone have experience how buildings affect to these processes? Buildings have an effect to the flow paths.. Is it possible to...
  2. Ravn

    Pipe flow, Manning's n, low flow

    My problem is following: I am trying to generate a elevation-disharge curve for a pipe with Manning's equation. I know the material (concrete), diameter (20 inches) and the slope (3%) of the pipe. There are some discharge measurements, but unfortunately these measurements are from low flow...
  3. Ravn

    How to calculater pipe discharge with upstream water elevation

    Dear all, What would be the best way to calculate/estimate the discharge in a pipe when the available data consist of pipe material (roughness), slope, lenght, diameter and upstream water level. I need an estimation for the discharge - water depth -curve for a specific pipe. It would be...
  4. Ravn

    2D dual drainage models

    I tried to ask about the benefits of the more accurate surface flow achieved with a 2D surface flow model in urban environment. In the "basic" urban drainage models, the surface flow is very simplified: One does have a catchment that is described with different parameters like...
  5. Ravn

    2D dual drainage models

    I'd like to ask your opinion about 2 dimensional (2D) dual drainage models. What benefits you think one is getting by modelling the drainage network with 2D flow model instead of simplifying areas to sub-catchments as well as simplifying their hydraulic and hydrologic phenomena? Is there any...
  6. Ravn

    Dynamic Array doesn't work

    Yep! Thanks a lot! That helped me forward and after that I discovered my initial statement for counter was also misplaced..
  7. Ravn

    Dynamic Array doesn't work

    1) a row from a text file is read with the "Line input" command 2) some information is picked up from that row with "Mid" (coordinates X,Y,Z and an index number) 3) index number indicates whether this point is a single point or a part of line, so there are to Cases how to continue from this...
  8. Ravn

    reading 3Dpolyline vertices from a file and drawing it in AutoCAD

    I have come across a problem I'm unable to solve: I have a text file, where each line contain such data as X, Y and Z coordinate and a index number telling whether this point is a separate point (empty or 0) or a member of a 3Dpolyline (for example all points with number 1 are on one polyline...

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