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§ 153.047 GRASS LINED DITCH CONSTRUCTION.
   Along streets classified as Local (Residential - R-1E) and as permitted in the Single-Family Residential R-1E zoning district, a drainage swale, ditch or channel with a vegetative lining may be used for conveyance of stormwater runoff when approved in advance by the City Engineer. Such ditches shall be designed as a stable trapezoidal or parabolic channel with a suitably protective vegetation lining to slow down concentrated runoff and prevent erosion.
(Ord. 2020-15, passed 6-15-2020)
DESIGN STANDARDS
§ 153.060 RELATIONSHIP OF NEW TO EXISTING STREETS.
   (A)   New streets shall be so arranged to provide for the continuation of collector streets between adjacent properties when the continuation is necessary for convenient movement of traffic, effective fire and police protection, efficient provision of utilities, and where the continuation is in accord with the city's future land use plan.
   (B)   Whenever any subdivision abuts an existing street that is narrower than the standards indicated in this section, the developer shall dedicate right-of-way on the side abutting the subdivision to permit compliance with the right of way width for the designated street classification.
   (C)   Whenever any subdivision is proposed in such a manner that it will front on either one or both sides of an existing street, the developer shall, at his or her own expense, be required to make improvements to the existing street so that it complies with the standards imposed herein, as determined by the city.
      (1)   If such a development is proposed to front only one side of an existing street, the cost to improve the street to the standards set herein shall be borne equally by the developer and the city.
      (2)   If such a development is proposed so that it fronts both sides of an existing street, the cost to improve the street to the standards set herein shall be borne entirely by the developer.
   (D)   Where a subdivision abuts or contains an existing or proposed arterial or collector street with usage over 1,000 vehicles/day, the City Council may require that access to the street be limited by one of the following means:
      (1)   That lots be subdivided so that they back onto the arterial street and front onto a parallel local street, thereby creating double frontage lots, and that the developer install screening in a reserve strip along the rear lot lines of the lots;
      (2)   That the developer create a series of cul-de-sacs, U-shaped streets or short loops entered from and generally at right angles to the arterial street at 500 feet per min intervals, with the rear lot lines of the lots at the termini of the streets backing onto the minor arterial; or
      (3)   That the developer create a frontage road, separated from the arterial street by a planting strip, but having access thereto at suitable points.
   (E)   Any subdivision that exceeds a total of 50 lots shall be designed with two entrances accessing an adjoining street to provide alternate access to the subdivision in the event one of the entrances is blocked due to accidents, construction, or unforeseen circumstances. Any subdivision entrance servicing 25 homes or more shall be designed as a collector street.
(Ord. 2009-21, § 18.5-3-23, passed 10-5-2009; Am. Ord. 2016-29, passed 11-7-2016)
§ 153.061 DESIGNING BLOCKS.
   (A)   Block width. Wherever practicable, blocks shall be sufficiently wide to accommodate two tiers of lots having the minimum depth required by the applicable zoning district regulations. This requirement may be waived in blocks adjacent to local collector streets, railroads, or watercourses.
   (B)   Block length. No block shall be longer than 1,400 feet, nor shorter than 500 feet; provided, however, that wherever practicable, blocks along collector streets shall not be less than 1,000 feet in length.
   (C)   Driveways. Driveways shall be located on the lowest classification of street abutting the property. Driveways accessing onto arterial or collector streets are discouraged and to the greatest extent possible should be located on local residential streets, i.e., cul-de-sacs, loops and the like that intersect arterials. Driveway access directly onto collector streets is permitted only subject to the condition that adequate driveway turnaround space is allowed for front end entry onto the collector street. Exceptions to this design standard may be granted at the sole discretion of the city.
   (D)   Pedestrian access routes (PAR). A pedestrian right of way, shall be required through blocks where necessary to provide pedestrian circulation or access to schools, playgrounds, shopping centers, transportation, or other community facilities. A PAR will consist of a ten foot-wide easement with a five foot-wide sidewalk and will be required when:
      (1)   A block is over 1,000 feet long.
      (2)   A cul-de-sac over 600 feet in length and paralleling an adjacent street should have a PAR between the two rights-of-way.
      (3)   A “barrier” is present between adjacent blocks. A barrier is a non-transversable feature such as a creek, utility easement, or railroad.
      (4)   The PAR requirement may be waived by the City Engineer if the natural terrain is too steep for the PAR to be made Americans with Disability Act (ADA) compliant or another obstruction exists that would create a hardship on the owner/developer.
(Ord. 2009-21, § 18.5-3-24, passed 10-5-2009; Am. Ord. 2016-29, passed 11-7-2016; Am. Ord. 2017-09, passed 5-1-2017)
§ 153.062 DESIGNING INTERSECTIONS.
   (A)   No more than two streets shall intersect at any one point.
   (B)   Streets shall be laid out so as to intersect as nearly as possible at right angles.
      (1)   In no case shall two streets intersect at an angle of less than 75 degrees.
      (2)   An oblique street shall be curved as it approaches an intersection so that it is approximately at right angles with the intersection for a distance of at least 100 feet therefrom, unless the subdivider's engineer recommends, and the City Engineer concurs, that a lesser distance would be in accordance with safe and accepted traffic engineering practices.
   (C)   Proposed new intersections along one side of an existing street shall, wherever practicable, align with any existing intersection on the opposite side of the street.
      (1)   Offset intersections of less than 150 feet shall not be permitted, except where the intersected street has divided lanes without median breaks at either intersection.
      (2)   Intersections involving collector or arterial streets shall be at least 500 feet apart.
   (D)   Returns at intersections shall be made concentric and shall be rounded by a radius of not less than 20 feet at the right-of-way line, and not less than 30 feet at the back of curb line.
   (E)   All street intersections shall be built in such a way that whenever practical, the cross-slopes thereon do not exceed 3%.
   (F)   The approach to an intersection shall be designed and built so that for a distance of at least 75 feet from the centerline of the intersection the grade does not exceed 3%.
   (G)   Earth banks or existing vegetation over 3.5 feet tall within the intersection site triangular depicted herein on the standard specification plan sheets shall be removed within the public right-of-way.
(Ord. 2009-21, § 18.5-3-25, passed 10-5-2009; Am. Ord. 2016-29, passed 11-7-2016)
§ 153.063 DESIGNING CURVES.
   (A)   Where curvilinear horizontal alignment is utilized for subdivision streets, the minimum centerline radius shall be as indicated below, unless otherwise dictated by site constraints and reviewed by the City Engineer:
      (1)   Arterial and commercial collector street - according to the IDOT “Bureau or Local Roads and Streets Manual,” Chapter 29.
      (2)   Residential collector street -150 feet; and
      (3)   Local street - 75 feet.
   (B)   If horizontal reverse curves are to be utilized on any collector street or arterial street, the radii of which are less than 300 feet, a tangent at least 100 feet in length shall be introduced between the curves, as depicted on the standard specification plan sheets.
   (C)   The minimum vertical curve length shall be as indicated below, unless otherwise dictated by site constraints and reviewed by the City Engineer:
      (1)   Arterial and commercial collector street - according to the IDOT “Bureau or Local Roads and Streets Manual,” Chapter 30.
      (2)   Residential collector street -120 feet; and
      (3)   Local street - 90 feet.
(Ord. 2009-26, § 18.5-3-21, passed 10-5-2009; Am. Ord. 2016-29, passed 11-7-2016)
§ 153.064 DESIGNING DEAD-END STREETS.
   (A)   Temporary stub streets.
      (1)   If property adjacent to a subdivision is undeveloped and the comprehensive plan, the Planning Commission or the City Engineer proposes the future extension of streets from the subdivision presented for development into the undeveloped property, the streets may be allowed to dead-end temporarily. In this case, the right-of-way shall be extended to the property line, a temporary turnabout shall be provided at the terminus, and no strip that would prevent connections with future streets shall be reserved.
      (2)   A temporary concrete or asphalt surface turnabout with a minimum radius of 30 feet shall be provided at the terminus of any temporary dead-end street whenever the distance along the dead-end street measured from the terminus to the nearest intersection is greater than one contiguous lot.
   (B)   Permanent dead-end streets. For greater convenience to traffic and more effective police and fire protection, permanent dead-end streets shall be limited to 1,000 feet in length.
      (1)   The terminus of a permanent dead-end street shall not be closer than 100 feet to the boundary of an adjacent tract.
      (2)   A cul-de-sac turnaround, having a minimum right-of-way radius of 50 feet and a minimum pavement radius of 45 feet, shall be provided at the end of every permanent dead-end street, as depicted on the standard specification plan sheets.
      (3)   A pedestrian access route should be provided when applicable per section § 153.061.
(Ord. 2009-21, § 18.5-3-27, passed 10-5-2009; Am. Ord. 2016-29, passed 11-7-2016)
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