Loads Tab

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Surcharge DL, psf:

Enter the dead load surcharge.

Surcharge LL, psf:

Enter the live load surcharge – it will not be used to resist overturning or sliding.

Seismic A factor:

Specified horizontal peak ground acceleration expressed as a fraction of the gravitational constant, g. The site-specific values of A represent a 90% probability of that value not being exceeded in 50 years. See NCMA 3rd Edition, Section 9.4.

dseismic:

The lateral deflection that the retaining wall can withstand during a seismic event, in units of inches. See NCMA 3rd Edition, Section 9.4. Note that this input is optional. If a non-zero value is entered, the program will apply the formulas that consider the maximum permissible deformation. If the value is left zero (blank), the program will apply the formulas that are independent of the deformation.