Dana Probert

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August 27, 2009


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We do our stormwater curve number analysis with Map Topologies and Overlay Analysis. However we don't use the FDO do perform this task; only Topologies and Overlay Analysis on topologies.

Some have said to export our generated topologies for pre-cover, post-cover, drainage area, etc... to SDF files and perform as you have shown but it seems like more steps. What is KEY about topology overlay analyis is you can SAVE A TEMPLATE! So the next time you have to do an overlay analysis - and if you have a standard naming convention for your drainage, cover, and soils topologies and object data - you can simply load the saved overlay anaylsis template and you are off to the races!

It is working very well for us so far. On the back-side we also have an Excel spreadsheet that compresses the data with some VBA macros and pushes it directly into Hydraflow and HydroCAD.

I found a bit of a trick a couple weeks ago for generating floodplain boundaries.

We started with a ground surface from LIDAR, and generated cross-sections for our hydrologist to determine flood elevations.

Then I used a line/pline at each section, set at Mr Hydro's determined elevation, to create a "flood" surface. A volume surface comparing ground to the flood surface, using a contour-displaying style with a huge contour interval, then gives you a "zero" contour where the surfaces intersect - the floodplain boundary!

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