72 A SUMMARY OFACCESSIBILITY STANDARDS FOR OUTDOOR DEVELOPEDAREAS accessibility standards for Federal outdoor developed areas surface of the clear ground space must be firm and stable, but must also accommodate the use of tent stakes or other devices to secure the tent. 48" (1220 mm) 2% TO 5% MAX SLOPE ALL ALL AROUND DIRECTIONS Figure 28—Clear space requirements for tent pads and platforms. Slope [1013 3] When the surface of tent pads, tent platforms, and clear ground spaces is constructed of materials other than asphalt, concrete, or boards, the surface must be no steeper than 1:48 (2 percent) in any direction. When the surface is constructed of materials other than asphalt, concrete, or boards, slopes no steeper than 1:20 (5 percent) are allowed when necessary for drainage. Floor Height [1013 4] If the tent platform floor is raised above grade, the floor height must be no more than 19 inches when measured from the clear ground space to the tent platform surface. This height allows people using mobility devices to transfer from the device to the platform surface.