Barely Dry Adjustment

[rnugent3]

In PR #564, @Brennan1994 wrote some logic to correct the WSEs of the working profile when dry at structures where the structures get wet in the next largest profile. Brennan's adjustment sets the water surface elevation to 2 feet below the first floor elevation. In the Dean Method, our adjustment was to set the depth 2 feet below ground.

I think the dean method approach where we set the depth 2 feet below ground is the safer approach. Imagine a structure with a basement where the foundation height is 3ft and the beginning damage depth is 2 feet below the first floor elevation. In that case, we'll inundate a structure even though modeling suggests that the structure is dry.

@Brennan1994 @HenryGeorgist @rtle76 what do you guys think?