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A special wet/dry algorithm is used. If water level results are not specified (_h.dat or -typeH), the algorithm opens these files, as well as opens the .2dm file associated with the results files, and uses the water levels and ZH Zpt values (for 2D cells) and elevations at the WLL triangle corners to determine whether a node (corner of an mesh element) is wet or dry. This allows two special values to be output in the event that a node is dry in one results file and wet in the other or vice versa. A value of 99 is used to indicate that a node is dry in the first results file, but is flooded in the second results file, while +99 indicates that the node was wet in the first results file but is dry in the second results file. Specifying '''-nowetdry''' does not carry out a wet/dry check using the water level results.
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The -t option can be used to carry out the difference at a particular time (rather than all times). The most common time is to take the difference at the flood peak,
<u>Examples</u><br>
<li><tt>dat_to_dat.exe -dif results_developed_h.dat results_existing_h.dat</tt></li>
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