87.1170 Access and Parking.

(a) The following standards define access criteria:

(1) Driveway grades up to a maximum of twelve (12) percent may be permitted, and shall be aligned with the natural contours of the land. Proper design considerations shall be employed, including such items as vertical curves and parking landings. In any case, parking landings shall be utilized on all drives over ten (10) percent grade.

(2) Driveways shall not be permitted which exceed twelve (12) percent slope except that one length, not at the point of access, of not more than twenty (20) feet may have a slope of sixteen (16) percent.

(3) Grooves for traction should be incorporated into the construction of driveways with a slope of ten (10) percent or greater.

(4) Roadways and driveways, where feasible, should conform to the natural landform. They should not greatly alter the physical and visual character of a hillside by creating large notches in ridgelines or by defining wide straight alignments or by building switch-backs above the hillside view line. Reduced road sections, split sections and parking bays should be utilized in the layout of hillside streets.

87.1175 Drainage.

• (a) The following standards complement those contained in the Grading Manual.

(1) Debris basins, rip rap, and energy dissipating devices shall be provided where necessary to reduce erosion when grading is undertaken. Except for necessary flood control facilities, significant natural drainage courses shall be protected from grading activity. In instances where crossing is required, a natural crossing and bank protection shall be preferred over steel and concrete systems. Where brow ditches are required, they shall be naturalized with plant materials and native rocks.

(2) Building and grading permits shall not be issued for construction on any site without an approved location for disposal of runoff waters, including but not limited to such facilities as a drainage channel, detention basins, public street or alley, or private drainage easement.

• (3) All cuts shall be drained.

(4) The use of cross lot drainage shall be permitted subject to City Engineer review, and may be approved after demonstration that this method will not adversely affect the proposed lots or adjacent properties, and that it is absolutely required in order to minimize the amount of grading which would result with conventional drainage practices. Where cross lot drainage is utilized, the following shall apply:

(A) Project interiors - One lot may drain across one other lot if an easement is provided within either an improved, open V-swale gutter, which has a naturalized appearance, or within a closed drainage pipe which shall be a minimum twelve (12) inches in diameter. In both cases, an integral wall shall be constructed. This drainage shall be conveyed to either a public street or to a drainage easement. If drainage is conveyed to a private easement, it shall be maintained by a homeowners association, otherwise the drainage shall be conveyed to a public

alized appearance, or within a closed drainage pipe which shall be a minimum twelve (12) inches in diameter. In both cases, an integral wall shall be constructed. This drainage shall be conveyed to either a public street or to a drainage easement. If drainage is conveyed to a private easement, it shall be maintained by a homeowners association, otherwise the drainage shall be conveyed to a public

easement. The easement width shall be determined on an individual basis and shall be dependent on appropriate hydrologic studies and access requirements.

(B) Project boundaries - On-site drainage shall be conveyed in an improved open V-swale, gutter, which has a naturalized appearance, or within an underground pipe in either a private drainage easement, which is to be maintained by a homeowner’s association or other approved mechanism, or it shall be conveyed in a public easement. The easement width shall be determined on an individual basis and shall be dependent on appropriate hydrologic studies and access requirements.

(5) Where possible, drainage channels should be placed in inconspicuous locations, and more importantly, they should receive a naturalizing treatment including native rock, colored concrete and landscaping, so that the structure appears as an integral part of the environment.

(6) Natural drainage courses should be preserved and enhanced to the extent possible. Rather than features should be incorporated as an integral part of the project design.