• RE: Elevations

    Tom Walski
    Tom Walski
    I just looked up the Root Mean Square Error for Google Earth elevation data and it is only 6.213 m, which I would not consider to be accurate enough for modeling, except for very rough checking in hilly areas.
    • 11 months ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • RE: Elevations

    Tom Walski
    Tom Walski
    One of the best sources of elevation data are LIDAR data sets. You may want to check with your local planning agency, federal government or sewer utility to see if they have any LIDAR data. Google Earth also is a source of elevation data if you just…
    • 11 months ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • RE: Elevations

    Tom Walski
    Tom Walski
    While cell phone GPS devices are all right for getting x,y coordinates, they are not very good for elevation for modeling. You'll always have issues with pressure calculations if you elevations are not accurate. You need to be talking about "sub-meter…
    • 11 months ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • RE: Comparing field and model data

    Sushma Choure
    Sushma Choure
    Hello Christen, It is assumed that you already have the important measurements like tank HGL, PRV readings from field, so including those readings and readings at nodes away from boundary elements you should be able to create a graph as shown. It is…
    • over 1 year ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • RE: Comparing field and model data

    Jesse Dringoli
    Jesse Dringoli
    There would be multiple paths to the node in red. I think the point that the graph is trying to make is that as you move downstream along any given pipeline (whether it's the one on the left side or the right side leading to the red circled node does…
    • over 1 year ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • RE: Pipe merging

    Jesse Dringoli
    Jesse Dringoli
    Christen Crique said: If I do not have skelebrator can I still merge pipes where there are isolation valves and retain the GIS-ID's of both pipes? If you do not have Skelebrator, then you will not be able to use the "Inline Isolation Valve Replacement…
    • over 1 year ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum