(A) Street plan.
(1) The arrangement, character, extent, width, grade and location of all streets shall conform to the official plan and shall be considered in their relation to existing and planned streets, to reasonable circulation of traffic within the subdivision and adjoining lands, to topographical conditions, to runoff of storm water, to public convenience and safety, and in their appropriate relation to the proposed uses of the area to be served.
(2) Every street in any subdivision shall be dedicated as a public street and no private streets shall be approved, except by special action of the Plan Commission and the City Council.
(3) The layout of streets shall show right-of-way widths and street names (not duplicating the name of any street heretofore used in the city or its environs, unless the street is an extension of an already named street, in which case, the name shall be used), and showing a proposed through street extended to the boundaries of the subdivision.
(a) Right-of-way widths of major traffic-ways, including freeways, parkways, major and secondary thoroughfares, shall be in accordance with those designated on the official plan.
(b) All right-of-way widths shall conform to the following minimum dimensions:
1. Collector streets: 80 feet;
2. Minor streets: 60 feet;
3. Cul-de-sac streets: 66 feet; and
4. Marginal access streets: 40 feet.
(c) A cul-de-sac street shall not be more than 500 feet in length measured along its centerline from the street of origin to the end of its right-of-way, unless there are less than 16 lots abutting the cul-de-sac street. Each cul-de-sac shall have a terminus of nearly circular shape with a minimum diameter of 120 feet.
(d) Provisions shall be made for serving lots abutting arterial streets and highways by either the use of a marginal access street, or backing lots to the arterial street with a screen planting contained in a non-access reservation along the rear property line.
(e) It must be evidenced that all street intersections and confluences encourage safe and efficient traffic flow. The intersection of more than two streets shall be avoided, unless specific conditions of design indicate otherwise.
(f) Minor streets shall be so aligned that their use by through traffic will be discouraged.
(g) Where there is a deflection in the street alignment in excess of ten degrees, a curve shall be inserted with a radius not less than:
1. Collector streets: 300 feet; and
2. Minor streets: 150 feet.
(h) Tangents at least 50 feet long shall be introduced between reverse curves on collector streets.
(4) The existing and proposed centerline profile and cross section of each street shall be shown, indicating also when a new subdivision abuts a previously dedicated street right-of-way that all required street improvements out to the centerline of this existing street bounding the new subdivision shall be installed to meet and comply with the current standards of the city.
(a) Where there is a deflection in the horizontal centerline within a given block at any one point in excess of ten degrees, a curve shall be inserted with a radius of not less than:
1. Collector streets: 300 feet; and
2. Minor streets: 150 feet.
(b) Gradients of streets shall be at least 0.4% and shall not exceed on:
1. Collector streets: 5%; and
2. Minor streets: 7%
(5) The preliminary plan shall show, or a certificate shall be submitted to the effect that the subdivider will install all of the following items in accordance with the current standards and specifications as set forth in pertinent city ordinance:
(a) Pavements, asphalt;
(b) Curbs and gutters (not mandatory);
(c) Street lights (not mandatory);
(d) Sidewalks (not mandatory); and
(e) Street signs (not mandatory).
(B) Block standards.
(1) Block numbers will be shown.
(2) The maximum lengths of blocks shall be 1,200 feet. Blocks over 900 feet long may require pedestrian ways at their approximate centers. The use of additional access ways to schools, parks or other destinations may be specified by the Plan Commission.
(3) No specific rule concerning the shape of blocks is made, but blocks must fit readily into the overall plan of the subdivision and their design must evidence consideration of topographical conditions, lot planning, traffic flow and public open space areas.
(4) Blocks intended for commercial, industrial and institutional use must be designated as such.
(5) Where a subdivision borders on or contains a railroad right-of-way or limited access thoroughfare right-of-way, the Plan Commission may require a street approximately parallel to and on each side of such right-of-way at a distance suitable for the appropriate use of the intervening land as for:
(a) Park purposes;
(b) Deep residential lots backing to a railroad or arterial street with a planting screen in a no-access area at rear property lines of lots; or
(c) Motor vehicle parking, business or industry with due regard for the requirements of approach grades and future grade separations.
(C) Lot standards.
(1) In general, lots should be as nearly rectangular in shape as practicable.
(2) The minimum lot dimensions for residential development shall be 70 feet wide at the established building line and not less than 100 feet in average depth, and containing not less than the minimum lot area requirements of the Zoning Code. These minimum requirements shall not apply to land subdivided for non-residential development.
(3) All lots shall have not less than the minimum width of the lot abutting on a publicly dedicated street.
(4) Side lines of lots shall be at right angles or radial to the street line, or substantially so.
(5) Corner lots shall be not less than 90 feet in average width.
(6) Double frontage lots are not permitted, except:
(a) Where lots back upon an arterial street, and in such instances, vehicular and pedestrian access between lots and the arterial street is prohibited; and
(b) Where topographic or other conditions render subdividing otherwise unreasonable, such double frontage lots shall have an additional depth of at least 20 feet in order to allow for a protective screen planting on one frontage.
(7) Lots abutting upon a watercourse, drainageway, channel or stream, shall be of an additional depth or width, as required, to provide an acceptable building site.
(8) In the subdividing of any land within the city or within one and one-half miles of the corporate limits, due regard shall be shown for all natural features, such as tree growth, watercourses, historic spots or similar conditions.
(9) The layout, numbers, areas and dimensions of lots to the nearest foot, and the proposed land use for each lot, parcel or tract shall be indicated.
(10) The minimum front and side street building setback lines shall be shown and dimensioned in accordance with the applicable zoning code requirements.
(D) Parks and other public areas.
(1) Where any area is specifically designated on the general development plan of the city, for a public park, playground, school or other public use, and is owned by the subdivider, such area shall be reserved for such use on all subdivision plans and plats, and the acquisition of such area may then be secured by the City Council or arrangements made for its acquisition within a period not to exceed one year from the date of approval of the final plan. The value of such lands shall be established by three qualified appraisers; one of whom shall be appointed by the Plan Commission, one by the subdivider, and one of whom shall be mutually agreed upon by the other two.
(2) Should the City Council decide to take such premises, then and in that case, it shall make arrangements to pay the subdivider therefor the appraised value as determined by the above described appraisers, or a sum that is mutually agreed upon. The City Council may accept any donation of land as above described should the subdivider desire to contribute the same to the city.
(E) Utilities.
(1) Source of domestic water supply and type of sewage disposal, location of sites for community domestic water plant and/or community sewage treatment plant.
(2) Storm water drainage.
(a) Complete storm sewer system, including pipe sizes, inlets and inverts.
(b) A proposed surface water drainage pattern for each individual lot, block and street.
(3) All easements as required in § 153.060 shall be indicated.
(4) Protective covenants.
(5) An outline of all proposed protective covenants shall accompany the preliminary plan and shall include a protection against the obstruction of any surface water drainage easement.
(1975 Code, § 34.11)