Figure 4-14. Balancing
Figure 4-15. Transitioning Regraded Areas.
existing contours can be retained, the existing
Islands and medians, as well as curb and gutter,
drainage patterns can be maintained. Grading can
can be used to control drainage within parking
be used to correct existing drainage problems.
areas. Porous surfaces which allow limited infiltra-
Where extremely steep slopes are contributing to
tion (e.g., gravel or lock-block) should be consid-
rapid runoff, regrading with more moderate slopes
can slow the velocity and achieve a more balanced
b. Grading. Topography helps determine the
amount, direction and rate of runoff. To the extent