ORD 674 04/26/2005 ORDINANCE NO. 6 7 4
AN ORDINANCE OF THE CITY OF CIBOLO, TEXAS,
AMENDING ORDINANCE NO. 590 LAND SUBDIVISION
ORDINANCE, AS AMENDED, BY ADDING APPENDIX B
CONSTRUCTION STANDARDS SECTION D DRAINAGE AND
STORM SEWERS SUBSECTION 3 0; AMENDING APPENDIX A
DESIGN STANDARDS SECTION J PAVEMENT DESIGN
SUBSECTIONS 3 THROUGH 7; AMENDING APPENDIX A
SECTION G RIGHT-OF-WAY AND PAVEMENT WIDTHS
SUBSECTION 5 PARAGRAPHS a and d; PROVIDING FOR
INCORPORATION; PROVIDING FOR ADOPTION; PROVIDING
THAT THIS ORDINANCE IS CUMULATIVE OF ALL OTHER
ORDINANCES OF THE CITY OF CIBOLO NOT IN CONFLICT
WITH THE PROVISIONS OF THIS ORDINANCE; PROVIDING
FOR SEVERABILITY; PROVIDING SAVINGS; AND PROVIDING
FOR AN EFFECTIVE DATE.
WHEREAS, the City of Cibolo, Texas, is a Home Rule Municipality located in
Guadalupe County, Texas, created in accordance with provisions of the Texas Local
Government Code and operating pursuant to its adopted City Charter and all applicable
laws and enabling legislation of the State of Texas; and
WHEREAS, the City of Cibolo, Texas, is governed by a Home Rule Charter that was
approved by the Citizens of Cibolo in a duly called election held on September 11, 2004;
and
WHEREAS, the City of Cibolo, Texas, adopted Ordinance No. 590 (Land Subdivision
Ordinance) declaring the policy and rules and regulations governing the platting and
subdivision of land in the City limits and in the extraterritorial jurisdiction; and
WHEREAS, the City Council has considered the merits of these amendments to the
Land Subdivision Ordinance and has determined that this ordinance is necessary to
protect the health, safety,morals, and welfare of the community.
BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF CIBOLO,
TEXAS...
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SECTION 1.
INCORPORATION
That the above and foregoing premises are true and correct and are incorporated herein
and made part hereof for all purposes.
SECTION 2.
ADOPTION
That the Ordinance provisions incorporated in Section 3 herein are hereby adopted by the
City Council of the City of Cibolo,Texas, and amend Ordinance No. 590.
SECTION 3.
AMENDMENTS
That Appendix B. CONSTRUCTION STANDARDS, Section D., Subsection 3. shall be
amended by adding the following Paragraph o.:
"o. Design Parameters
1. Where required by the City Engineer, channels shall have sufficient gradient,
depending upon the type of soil or channel lining material, to provide velocities
that will be self-cleaning (greater than two (2) feet per second)but will not be so
great as to create erosion. Maximum permissible velocities are as specified in
the Velocity Criteria included in Subection 3 below.
2. Appropriate energy dissipating structures may be used to control erosion due to
high velocities at pipe system outfalls and steep grades and shall be designed in
accordance with accepted design practices such as outline by the Soil
Conservation Service, the U.S. Army Corps of Engineers, the Bureau of Land
Reclamation, or the Texas Department of Transportation(TxDOT).
3. Velocity Criteria
a. The table below shall be used to determine maximum permissible channel
velocity.
Maximum Permissible Channel Velocity
Velocity(fps) Type of Facility Required Hydraulic Correction Maximum Permissible
Radius(ft.) Factor Velocity
0-1 0.8 5
1 to 6(Maximum 1-3 0.9 5.5
Average Velocity=Vegetated Earthen Channel 3-5 1.05 6.3
6 fp.s. 5-8 1.15 6.9
8-10 1.225 7.35
More than 10 1.25 7.5
6 to 8 Concrete Retards NA NA NA
Greater than 8 Concrete Lining or Drop Structures NA NA NA
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b. Where velocities are in the supercritical range, allowance shall be made in
the design for the proper handling of water.
c. Channel design must ensure that the channel will contain the hydraulic jump
(sequent depth) throughout the extent of the superficial profile. An
exception to this criterion is where concrete lined lateral channels discharge
down the side slopes of channels. These channels may be designed for
normal depth plus freeboard provided velocity controls are established at the
main channel flowline.
d. Channel design must ensure that the energy grade of the channel will not
result in upstream flooding at existing or proposed lateral facility
connections.
e. For vegetated earthen channels, vegetation shall be installed in a uniform
manner and shall be kept in a well-maintained condition until final
acceptance by the City of Cibolo."
That Paragraphs 3 through 7 of Section J PAVEMENT DESIGN in APPENDIX A
DESIGN STANDARDS of the City of Cibolo Land Subdivision Ordiance #590 shall be
amended to read as follows:
"3. Pavement Structure
The design of pavement structures shall be in accordance with the American
Association of State Highway and Transportation Officials (AASHTO) Guide for
Design of Pavement Structures, 1993 or latest approved edition. The pavement
design report shall be prepared and signed by, or under the supervision of, a
professional engineer registered in the State of Texas. The following design
requirements shall be used for pavement design:
a. Length of Service Life — Pavement shall be designed for a twenty-year (20-
year) service life.
b. Traffic Load, Reliability and Pavement Structures — The traffic load is
cumulative expected 18-Kip equivalent single axle loads (ESAL) for the
service life. The following 18-Kip ESAL Reliability Level and Pavement
Structure shall be used in the design of streets for each street classification:
Pavement Specifications
Street Classification 18-Kip Reliability Minimum Pavement Maximum Pavement
ESAL Level Structure Stucture
Primary and Secondary Arterials 3,000,000 R-95 SN=3.80 SN=5.76
Collector and Type"B" Streets 2,000,000 R-90 SN=2.92 SN=5.08
Type"A" Streets-w/Bus Traffic 1,000,000 R-70 SN=2.58 SN=4.20
Type"A" Streets-w/out Bus Traffic 100,000 R-70 SN=2.02 SN=3.18
Traffic loads for primary and secondary arterials,collector and local Type"B"strreets shall include bus traffic.
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c. Serviceability—The serviceability of a pavement is defined as the pavement's
ride quality and its ability to serve the type of traffic (automobiles and trucks)
that use the facility. The initial serviceability index of (p0) for flexible
pavements shall be 4.2 and for rigid pavement shall be 4.5. The minimum
terminal serviceability index (Pt) for local streets shall be 2.0 and for
collectors and arterials shall be 2.5. A standard deviation (SO) for flexible
pavement shall be 0.45 and for rigid pavement shall be 0.35.
d. Roadbed Soil — A soil investigation must be performed for the design of
pavement structures. The number of borings and locations must be sufficient
to accurately determine the stratum along the route. Any existing soil
information that is available either from the City or from private sources will
be evaluated by the City and, if determined to be applicable and valid, will be
allowed in place of new soil tests.
Roadbed soil having a plasticity index (P.I.) greater than twenty (20) shall be
treated with lime to reduce the P.I. below twenty (20). Application rate of
lime shall be determined by the City Engineer based on laboratory testing. In
no case shall the lime be less than fifteen (15) pounds per square yard for six
(6) inches of lime treated subgrade. Lime treated subgrade shall be included
as a"structural layer" within the pavement design calculations. Proposals for
stabilization alternatives in place of the use of lime will be considered for
approval by the City Engineer upon submittal of an engineering report
verifying adequate stabilization of the highly plastic soil.
Where the roadbed is in a rock excavation a "Structural Layer" within the
pavement design calculations may be used that is equivalent to a structural
layer for the Lime Stabilized Subgrade, as approved by the City Engineer. If a
roadbed Structural Layer is used in the pavement calculation for rock
subgrade as approved by the City Engineer, an engineering report must be
provided to the City addressing the consistency of the subgrade prior to base
placement.
e. Pavement Layer Material — Alternative pavement materials may be used as
approved by the City Engineer where the existing soil or subsurface
conditions or the alternative materials provide a level of driveability
comparable to the materials otherwise required herein. Where the use of
alternative pavement materials are proposed for consideration by the City
Engineer, supporting engineering documentation must be submitted to the
City. The combination of the following materials will be allowed for
pavement structure:
1. lime treatment for subgrade;
2. flexible base;
3. prime coat;
4. tack coat;
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5. hot mix asphaltic concrete pavement;
6. asphalt treated base;
7. reinforced concrete; and
8. base reinforcement(geogrids).
The City Engineer in consultation with the Infrastructure Compliance
Manager in accordance with the standards provided herein must approve the
pavement combination.
f. Minimum Layer Thickness (Compacted) — If the following components are
utilized in proposed pavement sections, the minimum thickness for the
components shall be:
1. hot mix asphaltic concrete pavement shall not be less than one and one-
half(1 1/2) inches thick for surface course(Type D);
2. hot mix asphaltic concrete pavement shall not be less than two and one-
half(2 1/2) inches thick for a leveling-up course (Type B);
3. asphalt treated base shall not be less than four(4) inches thick;
4. flexible base shall not be less than six(6) inches thick; and
5. lime treatment for subgrade shall not be less than six(6)inches thick.
4. Deleted
5. Deleted
6. Deleted
7. Deleted"
That Paragraphs a. and d., Subsection 5. Sidewalks, Section G RIGHT-OF-WAY AND
PAVEMENT WIDTHS in APPENDIX A DESIGN STANDARDS of the City of Cibolo
Land Subdivision Ordiance#590 shall be amended to read as follows:
"5. a. For new subdivisions sidewalks must be constructed along all street rights-of-way
and for redevelopment projects sidewalks must be constructed as required by the
City Council after recommendation by the Planning and Zoning Commission. All
sidewalks required herein shall be constructed as specified by the appropriate
section of Article II of the Land Subdivision Ordinance of the City of Cibolo.
d. Where utility poles, fire plugs or other utility installations occur within the
sidewalk width, the walk shall be offset around the obstacle at its full width. If
the available right-of-way is insufficient to offset the walk, the City Engineer
must approve the solution to the problem. Either additional right-of-way must be
dedicated to accommodate the sidewalk or a"Pedestrian and Sidewalk Easement"
must be granted of sufficient width and depth to accommodate the sidewalk.
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SECTION 4.
CUMULATIVE CLAUSE
That this ordinance shall be cumulative of all provisions of the City of Cibolo, Texas,
except where the provisions of this Ordinance are in direct conflict with the provisions of
such Ordinances, in which event the more restrictive provision shall apply.
SECTION 5.
SEVERABILITY
That it is hereby declared to be the intention of the City Council of the City of Cibolo that
the phrases, clauses, sentences, paragraphs, and sections of this Ordinance are severable,
and if any phrase, clause, sentence, paragraph or section of this Ordinance should be
declared unconstitutional by the valid judgment or decree of any court of competent
jurisdiction, such unconstitutionality shall not affect any of the remaining phrases,
clauses, sentences, paragraphs or sections of this Ordinance, since the same would have
been enacted by the City Council without incorporation in this Ordinance of any such
unconstitutional phrase, clause, sentence,paragraph or section.
SECTION 6.
SAVINGS
That all rights and privileges of the City of Cibolo are expressly saved as to any andall
violations of the provisions of any Ordinances affecting platting or subdivisions, which
have accrued at the time of the effective date of this Ordinance; and, as to such accrued
violations and all pending litigation, both civil and criminal, whether pending in court or
not, under such Ordinances, same shall not be affected by this Ordinance but may be
prosecuted until final disposition by the courts.
SECTION 7.
EFFECTIVE DATE
That this Ordinance shall be effective immediately upon the passage and approval of the
City Council of the City of Cibolo, Texas.
AND IT IS SO ORDAINED.
PASSED AND APPROVED by a vote of for to e5 against this 26th day of April,
2005.
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APPROVED:
jitoditipor,
Mayor Charles Ruppert
ATTEST:
Yvo i e Griffin, City S1 .,'-tary
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