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DESIGN MANUAL& KEYWALL OPERATING GUIDEGENERAL INPUTThe Project name and number input fields accept project text information for the title block on theprintouts. The Case input fields accept text data unique to each design case. The Date defaults to thepresent date unless manually changed.Metric UnitsKeyWall works in English units by default or Metric units when the metric option is selected underOptions/Project.Design MethodologyKeyWall permits analysis by eight different methods. The NCMA 2nd Edition method follows the1997 Design Manual for Segmental Retaining Walls, Second Edition and is based on Coulomb activeearth pressure analysis and failure planes.The NCMA 3rd Edition method is based on the 2009 NCMA Design Manual for Segmental RetainingWalls. It is similar to the NCMA 2nd Edition with a few exceptions: hinge height and connectionserviceability criteria have been eliminated, the designer has the option of including the vertical componentsin the external calculations, and NCMA 3rd Edition includes an additional design check called InternalCompound Stability(ICS). This option is not included in KeyWall 2010 and may be added at a later date(see description in KeyWall).Figure 5:7 General Tab5.9