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A. Conformity With Comprehensive Plan: The subdivision shall conform to the Comprehensive Plan of the City and parts thereof.
B. Provision For Future Subdivisions: If a tract is subdivided into parcels larger than ordinary building lots, such parcels shall be arranged to allow for the opening of future streets.
C. Reserve Strips Prohibited: There shall be no reserve strips controlling access to land dedicated or intended to be dedicated to public use. (Ord. 90-02, 6-5-1990)
A. No subdivision or part thereof shall be approved if proposed subdivision development in an established flood hazard area will individually or collectively, significantly increase flood flows, heights or damages.
B. Building sites, residences, motels, resorts and similar uses for human occupation in established flood hazard areas shall meet the requirements of the Federal Flood Insurance Program as adopted by the City.
C. Building sites for structures other than residences outside of established flood hazard areas shall ordinarily be filed as provided in the City's codes and ordinances controlling such activities.
D. When the Governing Body determines, based on study by the City staff, that only part of a proposed plat can be safely developed, it shall limit development to that part and shall require that the method of development be consistent with its determination.
E. When the subdivider does not intend to develop the plat himself and the City Engineer determines that limitations are required to insure safe development, the Governing Body may require the subdivider to impose appropriate deed restrictions on the land. Such deed restrictions shall be inserted in every deed and noted on the face of the final plat.
F. Floor level of the buildings are to be a minimum of eighteen inches (18") above the top of the nearest curb and gutter, the grade of which shall be approved by the City. The City shall require new construction within flood prone areas to meet or exceed the base flood elevation. (Ord. 16-07-17, 7-18-2017)
A. Street Layout:
1. Adequate and paved streets shall be provided by the subdivider and the arrangement, character, extent, width, grade and location of each shall conform to the Comprehensive Plan of the City and shall be considered in their relation to existing and planned streets, to topographic conditions, to public safety and convenience and in their appropriate relationship to the proposed use of land to be served by such streets. The street layout shall be devised for the most advantageous development of the entire neighborhood.
2. There shall be at least one hundred feet (100') of straight street between reverse curves.
3. Maximum distance between streets which are to align with existing and/or future streets shall be one thousand feet (1,000').
B. Relation To Adjoining Street System: Where necessary to the neighborhood pattern, existing streets in adjoining areas shall be continued and shall be at least as wide as such existing streets and in alignment therewith.
C. Projection Of Streets: Where adjoining areas are not subdivided, the arrangement of streets in the subdivision shall make provisions for the proper projection of streets into such unsubdivided areas.
D. Street Jogs: Street jogs with center line offsets of less than one hundred twenty five feet (125') shall be prohibited.
E. Street Intersections: Street intersections shall be as nearly at right angles as practicable, giving due regard to terrain, topography, site distances and safety. No intersecting street shall be plotted with the angle included between adjoining street lines less than seventy five degrees (75°) nor more than one hundred fifteen degrees (115°).
F. Dead-End Streets: Dead-end streets shall be prohibited, except as short stubs to permit future expansion.
G. Cul-De-Sacs: In general, cul-de-sacs shall not exceed five hundred feet (500') in length and shall have a turnaround of not less than one hundred feet (100') in diameter (ROW) with a pavement diameter of eighty feet (80') in residential areas and shall have a turnaround not less than two hundred feet (200') in diameter (ROW) with a pavement diameter of one hundred eighty feet (180') in commercial and industrial areas.
H. Streets On Comprehensive Plan: Where a subdivision includes a street as shown on the circulation plan of the City, that street shall be platted in the approximate location shown on the plan. The right-of-way shall be equal to or greater than that indicated on the Comprehensive Plan for streets.
I. Minor Streets: Minor streets shall be laid out so as to discourage their use by fast and through traffic. (Ord. 90-02, 6-5-1990)
J. Pavement Widths And Rights-Of-Way: The design standards for all roadways to be constructed under the requirements of the subdivision ordinance shall be constructed in accordance with the design standards as set out in table C3.2-1 of this section, incorporated herein for all purposes.
Residential streets (local streets) with a minimum right-of- way of fifty feet (50') and a minimum pavement width of thirty two feet (32') back of curb to back of curb.
TABLE C3.2-1
PROPOSED DESIGN STANDARDS
Revised 2017
Design Characteristic | Freeway | High Speed Principal Arterial | Principal Arterial | Minor Arterial | Collector | Residential Collector |
Design Characteristic | Freeway | High Speed Principal Arterial | Principal Arterial | Minor Arterial | Collector | Residential Collector |
Facility spacing (mi.) | 6 | 4 to 6 | 2 | 1 | 1/2 | n/a |
Signal spacing (mi.) | n/a | 1/2 | 1/2 | 1/2 | 1/2 | n/a |
Access spacing | 500' | 500' | 500' | 300' | 150' - 200' | n/a |
Unsignaled access spacing | n/a | 350' | 350' | 300' | 200' | n/a |
Number of moving lanes | 4 | 4 | 6 | 4 | 2 | 2 |
Number of access lanes | 4 | 0 | 0 | 0 | 0 | 0 |
Right-of-way width | 400' | 150' | 120' | 100' | 80' | 50' - 60' |
Pavement width | 152' | 76' - 84' | 76' - 90' | 66' | 44' | 37' - 43' |
Lane width | 12' | 12' | 12' | 11' - 12' | 11' - 12' | 11' - 12' |
Design speed | 70 mph | 60 mph | 50 mph | 50 mph | 40 mph | 30 - 30 mph |
Maximum grade | 4.0% | 5.0% | 5.0% | 5.0% | 6.0% | As per City Engineer |
Maximum curvature | 4.0% | 5.0% | 5.0% | 5.0% | 6.0% | As per City Engineer |
Stopping sight distance | 850' | 650' | 650' | 650' | 500' | As per City Engineer |
Vertical clearance | 16.5' | 16.5' | 16.5' | 16.5' | 16.5' | 16.5' |
Horizontal curve, radius | 2,640' | 1,320' | 1,320' | 1,320' | 660' | As per City Engineer |
Curb and gutter | n/a | 18" | 18" | 18" | 18" | 18" |
Median | 48' | 48' | 16' | 16' | 0' | 0' |
Corner clearance: | ||||||
Upstream | n/a | 300' | 300' | 300' | 150' | As per City Engineer |
Downstream | n/a | 300' | 300' | 300' | 150' | As per City Engineer |
Curb radius | n/a | 30' | 30' | 30' | 30' | 30' |
Shoulders: | ||||||
Inside | 10' | 4' | Curb | n/a | n/a | n/a |
Outside | 10' | 10' | Curb | Curb | Curb | Curb |
Pavement cross-slope (ft./ft.): | ||||||
Normal cross-slope | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 |
Superelevation (max.) | 0.06 | 0.04 | 0.04 | 0.04 | n/a | n/a |
Side slopes: | ||||||
Back slope | 4:1 - 6:1 | 4:1 | Curb | Curb | Curb | Curb |
Front slope | 12:1 | 6:1 | Curb | Curb | Curb | Curb |
Median slope | 6:1 | 8:1 | Curb | n/a | n/a | n/a |
Construction: | ||||||
Subgrade compaction | As per TXDOT | As per TXDOT | As per TXDOT | 95% - if P.I. >19 lime stabilizati on required | 95% - if P.I. >19 lime stabilizatio n required | 95% - if P.I. >19 lime stabilization required |
Base thickness and compaction | As per TXDOT | As per TXDOT | As per TXDOT | 12" - 98% | 10" - 98% | 8" - 98% |
Asphalt thickness and compaction | As per TXDOT | As per TXDOT | As per TXDOT | 2" - 98% | 2" - 98% | 1.5" - 98% |
Paving section escrow per L.F. of ROW | As per City Engineer | As per City Engineer | As per City Engineer | $87.66 | $66.68 | $32.56 - $40.20 |
K. Boundary Streets: Pavement widths and rights-of-way of streets forming part of the boundary of the subdivision shall be as follows:
1. Where the proposed subdivision abuts upon an existing street or half-street that does not conform to subsection J of this section, the subdivider shall dedicate right-of-way sufficient to make the full right-of-way width conform to subsection J of this section and there shall be paved so much of such right-of-way as to make the full pavement width comply with subsection J of this section. Before any pavement is laid to widen existing pavement, the existing pavement shall be cut back two feet (2') to assure an adequate subbase and pavement joint.
2. No half-streets will be permitted in new subdivision plats.
L. Curbs And Gutters: Curbs and gutters shall be installed by the subdivider on both sides of all interior streets and on the subdivision side of all streets forming part of the boundary of the subdivision.
M. Street Construction: Materials and workmanship shall conform with City standards for street construction as passed by resolution of the Governing Body.
N. Street Name: Names of new streets shall not duplicate or cause confusion with the names of existing streets unless the new streets are a continuation of or in alignment with existing streets, in which case names of existing streets shall be used. The developer shall provide and install street and traffic signs conforming to City standards and specifications and shall have approval by the City.
O. Street Patterns: Streets shall be platted with appropriate regard to natural and topographic features so as to lend themselves to attractive treatment.
P. Street Grades: Grades of all streets shall be sufficient to ensure adequate surface drainage, but shall not be more than eight percent (8%).
Q. Profiles And Elevations: The City Engineer and Governing Body shall require profiles and elevations of streets to determine compliance with any requirements of this section.
R. Marginal Access Street: Where a subdivision has frontage on or borders a collector, arterial, and/or an arterial street, the City of Alamo may require a marginal access street during the subdivision approval process; such a marginal access street may be provided when proposed residential lots back up to, side up to, or front such streets designed for heavier traffic. In the process of the plats’ examination where a marginal access street is imposed, the City will prohibit residential driveways from directly accessing onto the collector, arterial, and/or major thoroughfare. If a residential driveway is permitted to have such access by the Board of Commissioners due to very unique circumstances, then the City will have the latitude to impose other reasonable traffic safety measures, e.g., specifying the safe distance or location of the driveway along the lots’ frontage, private speed humps, additional street lighting, etc.
S. Median Islands in Paved Street Section: When a developer desires a median island within the boundaries of a paved street section, whether a public street or a private street, the median island template as found in Attachment A shall be required. It is declared that any developer/agent proposing deviation from the standards reflected thereon, shall file an application for variance which shall follow the subdivision variance protocol, inclusive of imposing the prevailing filing fee. The ultimate authority on whether variance should be awarded or not shall rest upon the Board of Commissioners. (Ord. 16-07-17, 7-18-2017; amd. Ord. 19-04-21, - -2021; Ord. 69-10-22, 10-4-2022)
A. Width And Paving: Alleys shall be provided at the rear of all lots in commercial, industrial, and townhouse subdivisions. Alleys may be provided at the discretion of the subdivider in residential and multi-family subdivisions. All alleys provided shall be paved and shall be twenty feet (20') in width. In lieu of alleys for residential subdivisions, the subdivider shall dedicate a utility easement in the back of all lots in a width of ten feet (10'). In lieu of alleys in commercial and industrial areas, the City may allow a paved fire lane to be located as per the direction of the Fire Marshal.
B. Intersecting Alleys Or Utility Easements: Where two (2) alleys or utility easements intersect or where an alley or utility easement turns at a right angle, a cutoff of not less than ten feet (10') from the normal intersection of the property or easement line shall be provided along each property or easement line.
C. Dead-End Alleys: Dead-end alleys shall not be permitted.
D. Alleys Which Do Not Connect On A Straight Course: If alleys are not themselves straight within each block or if the same do not connect on a straight course with the alleys of adjoining blocks, then all necessary easements shall be provided for the placing of guy wires in order to support poles set on curving or deviating rights-of-way of alleys. (Ord. 16-07-17, 7-18-2017)
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