17.31.290 Building and property line setbacks. This section is included in your selections. Slopes shall be set back from buildings and property lines as shown on Figure 290-1: Figure 290-1. 1If the slope is flatter than five horizontal to one vertical; the required setback is two feet. 2If the slope is flatter than five horizontal to one vertical; and no drainage ditch is located in this area; the required setback is two feet otherwise use tabular value. (Ord. 1576 NCS §1 (part), 1984.)