(a) Flatland Subdivisions. The following requirements are applicable to all flatland subdivisions within the jurisdiction of the City Development Department.
(1) The street layout shall be in general conformity with a plan for the most advantageous development of adjoining areas and the entire neighborhood.
(2) The street layout shall provide access to all lots and parcels of land within the subdivision.
(3) Where appropriate to the design, streets shall be established to avoid jogs at intersections and to promote continuity of local streets and those of higher classification.
(4) Streets shall be established to take advantage of the contour of the land so as to produce useable lots, cause a minimum of cutting and filling, and to produce streets with reasonable grades as defined in Section 1309.05(a).
(5) Certain proposed streets, where appropriate, shall be extended to the boundary line of the tract to provide for adequate circulation of traffic within the vicinity of the tract.
(6) Streets shall intersect other streets as near to a ninety degree angle as topography and other factors permit. Intersections of streets with arterial or collector streets shall be limited to a minimum angle of seventy degrees unless specifically approved by the Department.
(7) Whenever there exists a dedicated or platted portion of a street or alley adjacent to the proposed subdivision which conforms to the Thoroughfare Plan, the remainder of the street or alley shall be platted to the prescribed width within the proposed subdivision.
(9) Alleys shall be platted in the rear of all lots to be used for business and in the rear of residential lots fronting on arterial or collector streets as a means of safe access thereto. Alleys will not be approved in other locations in residential areas, unless required by unusual topography or other exceptional conditions .
(10) Lands abutting arterial or collector streets shall be platted with the view of making the lots, if for residential use, desirable for such use by cushioning the impact of heavy traffic on such trafficways, and with the view also of minimizing interference with traffic on such trafficways as well as the accident hazard. This may be accomplished in several ways:
A. By platting the lots abutting such trafficways at very generous depth, with setbacks or front yards at least twenty feet greater or deeper than otherwise required; and providing vehicular access to them by means of either alleys or service drives in the rear, or frontage access roads next to the trafficway, connected therewith at infrequent intervals;
B. By not fronting the lots on the highway or thoroughfare but on a parallel local street at a distance of a generous lot depth, in which case private driveways shall connect with such local street;
C. By a collector streets platted more or less parallel with the highway or thoroughfare, 600 to 1,000 feet distant therefrom, from which loop streets or dead-end streets would extend toward the highway, the ends of which provide access to the lots abutting the highway to their rear.
(11) Dead-end streets are often desirable and will be approved if limited to 1,000 feet long and twenty platted lots fronting thereon.
(12) Closed subdivisions, with one exit, shall be limited to 100 dwelling units if the entrance or exit street grade exceeds a rise of twenty feet in 200 feet; and shall be limited to 200 dwelling units if the street grade is less. When these limits are exceeded, a second exit must be provided which conforms to the street grade requirements of Section 1309.05.
(13) Blocks shall have sufficient width to provide for two tiers of lots of appropriate depth, unless, in the opinion of the Department, this is prevented by unusual topography or other physical conditions.
(14) The length of blocks shall be such as are appropriate, in the opinion of the Department, for the locality and type development contemplated, but shall not exceed 1,800 feet where the average lot size does not exceed two acres in area.
(15) In any block over 900 feet in length, the Department, may require that a crosswalk or pedestrian way, not less than ten feet wide, be provided near the center and entirely across the block.
(16) The number of intersecting streets along arterial and collector streets shall be held to a minimum, and where practicable, blocks along such trafficways shall not be less than 1,200 feet in length.
(b) Hillside Subdivisions. The following requirements are applicable to all hillside subdivisions within the jurisdiction of the Department:
(1) The following requirements of subsection (a) hereof for flatland subdivisions are applicable to hillside subdivisions: 1309.02(a)(1), (3), (5) to (7) and (16).
(2) The Department may, at its discretion, modify the following requirements of subsection (a) hereof for flatland subdivisions where they are to be applied to hillside subdivisions: 1309.02(a)(2) - see Note A following this subsection (b), (a)(9), (10) and (13) to (15).
(3) Streets shall be established to take advantage of the contour of the land so as to produce useable lots, cause a minimum of cutting and filling, and to produce streets with reasonable grades as defined in Section 1309.05(b).
(5) In hillside subdivisions, dead-end streets are often necessary and will be approved if limited to 2,000 feet long and fifty platted lots fronting thereon.
(6) Closed subdivisions, with one exit, shall be limited to 100 dwelling units if the entrance or exit street grade exceeds a rise of twenty feet in 200 feet; and shall be limited to 200 dwelling units if the street grade is less. When these limits are exceeded, a second exit must be provided which conforms to the street grade requirements of Section 1309.05(b).
NOTE "A" - Where it can be clearly demonstrated by the subdivider that the topographic conditions will prevent the utilization of all possible building sites in the subdivision if all lots are required to abut on a street, some variation from that requirement may be permitted by the Commission by means of the careful design and adequate construction of private drives subject to the following requirements:
A. Not more than three lots shall be served by any one private drive.
B. Private drives shall be constructed of the same material and with the same design characteristics as required for wider streets in Section 1309.04(b), except that the minimum surface width of a private drive may be sixteen feet.
C. Common and joint maintenance by all owners, present and future, of the lots served by the private drive shall be made a part of the deed of each of the lots stipulating adequate maintenance and insuring passability.
D. When private drives are utilized, provision shall be made on the lots for the off-street parking of at least three automobiles for each lot served by the private drive which shall be in addition to the zoning requirement for the area. Such additional off-street parking may be provided in a common and shared lot on the premises.
E. When the City Development Department approves the use of private drives in the subdivision, such approval shall be entered in writing in the Department records together with a copy of the deed restrictions which is required by subparagraph C. hereof.
(Ord. A-1090. Passed 4-4-67; Ord A-3166. Passed 3-23-76.)