1121.09 STREETS.
   (a)   Design and Arrangement. Excessive rights-of-way may be avoided to encourage aesthetics in road design and to avoid wide streets from destroying trees and natural land formations.
   (b)   Street Type and Width. The minimum right-of-way width for minor streets may be forty (40) feet in Group 1, and 2, and fifty (50) feet in Group 3, respectively.
   The Planning Commission reserves the right to require a greater width for local streets. The minimum width of local streets serving multiple dwellings shall be fifty (50) feet, and the pavement width shall be twenty-eight (28) feet.
   (c)   Alignment.
      (1)   Vertical profile grades shall be connected by vertical curves up to twenty percent (20%), but only for short, straight stretches.
      (2)   Minimum Horizontal. The radii of centerline curvatures shall ben o less than seventy-five (75) feet.
      (3)   Visibility Requirement. Waiver of visibility requirements (Section 1113.02(b)(3)) shall be given subject to the approval of the Planning Commission.
      (4)   Street Grades. Waiver of vertical curve requirements shall be given subject to the approval of the Planning Commission.
   (d)   Building Lines and Easements. Where the subdivision areas are to be used for residential purposes, the building line shall be established according to the following table:
 
         Minimum Building Setbacks
Group 1      20 feet from the right-of-way
Group 2      25 feet from the right-of-way
Group 3      25 feet from the right-of-way
   (e)   Lots.
      (1)   Eighty percent (80%) or more of the lots in any given subdivision shall conform to the minimum required lot area. The average size of all lots will conform to the minimum lot regulations.
      (2)   Lot area in thousands of square feet shall be determined by charting the average natural ground slope on the minimum regulation per family. Rounding should be made to the nearest five (5) feet of frontage interval.
   (f)   Undevelopable Land. Land subject to flooding, land with excessive slope, and land deemed by the Planning Commission to be undesirable for development shall not be platted for residential occupancy, nor for such other uses as may involve danger to health, life or property or to aggravate the erosion or flood hazard. Such land shall be set aside for compatible uses.
   (g)   Utility and Street Improvements.  
      (1)   Sewage disposal. Where public sewers are not available and where private sewage disposal systems will be utilized, the results of a percolation test shall be submitted in accordance with the recommendations of the City or County Health Department.
      (2)   Street Improvements.  
         A.   Width of pavement. The minimum pavement width for minor streets may be twenty (20) feet in class 1; twenty-two (22) feet in class 2; twenty-four (24) feet in class 3 type subdivision areas.
         B.   Curbs and gutters. Curbs shall be required on all streets designed to serve residential areas. Curbs shall be the straight side variety and shall have a radius of twenty (20) feet to face of curb and at street intersection.
         C.   Driveways. The maximum grade on driveways shall not exceed ten percent (10%). Each drive shall provide sufficient space and distance to turn around prior to entering a major thoroughfare.
   (h)   Sidewalks. Concrete sidewalks having a minimum width of four (4) feet and having minimum thickness of four (4) inches shall be installed along the uphill side of group 3 (15-26%) subdivisions.
   All subdivisions with an average natural ground slope of twenty-seven percent (27%) and over shall provide a three (3) foot graded area on the uphill side of the right-of-way.
   (i)   Retaining Walls. Retaining walls may be required wherever topographic conditions warrant or where necessary to retain fill or cut slopes within the right-of-way. Such improvements shall require the approval of the City Manager or his duly authorized agents.
(Ord. 67-11. Passed 1-24-67.)