Ummm, now I'm confused.
In my case its an ocean front property.
The BFE (by FEMA) is +10.0 NGVD.
The breakaway wall (masonry) is bearing on a concrete grade beam (pile supported). The top of the grade beam is at +12.0 NGVD. The wall is 10-ft high (begins at +12.0 NGVD and ends at +22.0 NGVD)...
In Chapter 5 of ASCE 7, equation 5.4-3 has the stillwater depth elevation, Ds as:
Ds = 0.65(BFE - G)
However, the Coastal Construction Manual has it as:
Ds = (BFE - G).
Does anyone the origin of the 0.65 factor? It makes a BIG difference in calculating the breaking wave on vertical walls.
Thank you.
