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ERROR 514: No data defined for Subbasin nnn in TR-55 time of concentration
section.
Missing the SCS TR-55 time of concentration data for the specified subbasin.
ERROR 515: RDII Unit Hydrograph nnn not assigned a rain gage.
When defining rainfall-dependent infiltrations/inflows (commonly
abbreviated as RDII), a RDII unit hydrograph is required.
ERROR 517: Error in reading TR-20 project data.
Incomplete SCS TR-20/TR-55 input data defined.
ERROR 518: Subbasin nnn time of concentration should be greater than 5 seconds.
The SCS TR-20 and SCS TR-55 hydrology methods require a time of
concentration greater than 5 seconds.
ERROR 519: Cannot open file (nnn) as the number of convergence trials was
exceeded.
Analysis did not converge, no output file present.
ERROR 520: Cannot open file (nnn) as file path was invalid.
The directory path to where the log file is to be, is not valid.
ERROR 521: Cannot open log file.
The log file already exists and is locked, the directory path is invalid, or some
other file I/O problem was encountered. If this continues to be a problem,
then restart the application and/or computer.
ERROR 522: Subbasin nnn not assigned to a downstream outlet node.
The runoff from the defined subbasin has no where to drain to. Make certain
to define the downstream outlet node it drains to.
ERROR 523: Cannot close the file nnn as file handle is invalid. Restart application
and/or computer.
File I/O problem was encountered. Restart the application and if that still does
not solve the problem, then restart the computer.
ERROR 524: Cannot deallocate memory. Restart application and/or computer.
Memory problem was encountered. Restart the application and if that still
does not solve the problem, then restart the computer.
ERROR 525: Ascending / receding limb multiplier must be greater than nnn.
The Rational Method ascending limb and/or receding limb multiplier cannot
be less than the value specified.
ERROR 526: Subbasin nnn area should not be smaller than 0.0064 acres
(0.00259 ha.) for SCS TR-20/SCS TR-55 hydrology method.
The TR-20 and TR-55 hydrology methods can model drainage area as small as
0.0064 acres, but not smaller. This is because the analysis engine for the SCS
(NRCS) TR-20 and TR-55 hydrology methods internally represent drainage
areas in terms of square miles with a 5 decimal digit precision. This
corresponds to a drainage area equal to 0.00001 mi2 (i.e., 0.00640 acres,
279 ft2, or 0.00259 hectares).
ERROR 528: Subbasin nnn circular channel diameter must be greater than zero.
When using channelized runoff in the HEC-1 hydrology method, the circular
channel must have a diameter defined.
110 | Chapter 4
Network Analysis