Section 27-481. Protection of adjoining property

(a) Curbs and bumpers. Open
  parking  lots shall be completely separated from adjoining land by curbs
  or bumpers of concrete, masonry, steel, heavy timber, or  other  similar
  and equally substantial materials, securely anchored so as to stop motor
  vehicles.  Curbs  and  bumpers  shall  be at least eight inches high and
  eight inches wide. The only openings permitted  in  required  curbs  and
  bumpers shall be for drainage and for motor vehicle entrances and exits,
  and at pedestrian entrances.
    (b)  Drainage.--Where  the  surface  paving  of an open parking lot is
  non-porous, such lot shall be drained as required by  subdivisions  (b),
  (c) or (d) of section P110.2 of reference standard RS-16, as applicable.
  An  asphaltic concrete surface, not to exceed one and one-half inches in
  thickness  after  compaction,  shall  be  considered  a  porous  surface
  provided  such  surface  will  pass  an  amount  of  water equivalent to
  one-half inch  of  rainfall  per  hour  and  provided  such  surface  is
  underlaid  by permeable soil, except that whenever an off-street parking
  facility is constructed in connection with the  construction  of  a  new
  building,  or whenever such parking facility falls within the definition
  of a substantial horizontal enlargement as set forth in subdivision  (a)
  of  section  P110.2 of reference standard RS-16, all storm water falling
  or coming to rest on such parking  facility  shall  be  disposed  of  as
  provided in section P110.2 of reference standard RS-16.