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Abnormal large spread on curb inlet in sag

While doing some testing with SUDA on a previous project that was done in GEOPAK Drainage, I noticed that I was getting some abnormal large spreads for curb inlets in a sag.  After I imported the .gdf file into a new file for SUDA testing, the spread was 10.12' while the spread in GEOPAK Drainage was 3.1138'.  They should be somewhat close. Why is this??


One thing I did change in SUDA was in the inlet catalog, I changed the default curb opening length from 5 to 60 (60"=5').  Then I ran the computation again and it was somewhat close on the spread.


Maybe the program is figuring the curb opening length incorrectly??  Please look into this. Thanks.