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The ground immediately adjacent to the foundation shall be sloped away from the building at a slope of not less than 1 unit vertical in 20 units horizontal (5-percent slope) for a minimum distance of 10 feet (3048 mm) measured perpendicular to the face of the wall. If physical obstructions or lot lines prohibit 10 feet (3048 mm) of horizontal distance, a 5-percent slope shall be provided to an approved alternative method of diverting water away from the foundation. Swales used for this purpose shall be sloped not less than 2 percent where located within 10 feet (3048 mm) of the building foundation. Impervious surfaces within 10 feet (3048 mm) of the building foundation shall be sloped not less than 2 percent away from the building.
Exceptions:
  1. Where climatic or soil conditions warrant, the slope of the ground away from the building foundation shall be permitted to be reduced to not less than 1 unit vertical in 48 units horizontal (2-percent slope).
  2. Impervious surfaces shall be permitted to be sloped less than 2 percent where the surface is a door landing or ramp that is required to comply with Section 1010.1.4, 1012.3 or 1012.6.1.
The procedure used to establish the final ground level adjacent to the foundation shall account for additional settlement of the backfill.

Related Code Sections

1804.4 Soils and Foundations, Site Grading
The ground immediately adjacent to the foundation shall be sloped away from the building at a slope of not less than one unit vertical in 20 units ...
1804.4 Soils and Foundations, Site Grading
The ground immediately adjacent to the foundation shall be sloped away from the building at a slope of not less than 1 unit vertical in 20 units ...
1107.7.4 Accessibility, Site Impracticality
to a percentage that is equal to the percentage of the entire site having grades, prior to development, that are less than 10 percent, provided that all ...
1108.7.4 Accessibility, Site Impracticality
to a percentage that is equal to the percentage of the entire site having grades, prior to development, that are less than 10 percent, provided that all ...
1808.7.4 Soils and Foundations, Foundation Elevation
On graded sites, the top of any exterior foundation shall extend above the elevation of the street gutter at point of discharge or the inlet ...