(a) 
The subdivider shall retain the services of an engineer, registered in the State of Texas, whose seal shall be placed on each sheet of the final drawings, and who shall be responsible for the design and inspection of the drainage, roads and streets, and sewer and water facilities within the subdivision. The services performed by the engineer shall be as designated in the latest issue of "Manual of Professional Practice -General Engineering Services" published by the Texas Society of Professional Engineers, and shall include both design and inspection as defined therein.
(b) 
Performance bonds and maintenance bonds shall be submitted for 100% of the cost of all work and for performance of all materials and equipment for two years after acceptance by the city.
(Ordinance 3-3-01, sec. 3.1, adopted 3/13/2001; 1997 Code, sec. 153.40)
(a) 
Block length.
(1) 
Residential:
Residential blocks shall be not longer than 1,350 feet, measured along the center of the block, nor shorter than 600 feet.
(2) 
On major streets:
Maximum block length along a major street shall be 1,600 feet except under special conditions and upon approval of the planning and zoning commission.
(b) 
Block width.
Blocks shall be wide enough to allow two tiers of lots of at least minimum depth, except when prevented by the size of the property or the need to back up to a major thoroughfare.
(c) 
Block numbering.
Blocks shall be numbered consecutively within the subdivision and/or sections of the overall plat as recorded.
(Ordinance 3-3-01, sec. 3.2, adopted 3/13/2001; 1997 Code, sec. 153.41)
The following standards apply to all residential lots.
(1) 
Lot size.
(A) 
Within city:
The lot size of all lots platted within the city shall conform with the zoning ordinance on the basis of the district in which they lie and the use to which they are to be put and shall conform to the regulations of the zoning ordinance, including minimum area, width, and depth.
(B) 
Outside city:
All other subdivision plats within the jurisdiction of this subdivision code shall show lots meeting all of the following conditions:
(i) 
The depth of any lot shall not exceed one and one-half times the average of the front lot and rear lot dimensions.
(ii) 
The minimum area of any lot shall be not less than 7,000 square feet.
(iii) 
Corner lots shall have a minimum width of 75 feet on residential streets and 85 feet on major thoroughfares.
(iv) 
Minimum usable lot depth for lots backing on natural drainage easements shall be not less than 80 feet measured between front lot line and drainage easement.
(2) 
Lot facing.
(A) 
Street frontage:
Each lot shall be provided with the minimum frontage on an existing or proposed public street as required by the zoning ordinance or 70 feet for lots located within the extraterritorial jurisdiction.
(B) 
Double front:
Double front lots are prohibited except when backing on major thoroughfares.
(C) 
Front facing:
Wherever feasible, each lot should face the front of a similar lot across the street. In general, an arrangement placing adjacent lots at right angles to each other should be avoided.
(3) 
Lot numbering.
All lots shall be numbered consecutively within each block. Lot numbering may be cumulative throughout the subdivision if the numbering continues from block to block in a uniform manner that has been approved on an overall preliminary plat.
(4) 
Driveway restrictions.
Rear and side driveway access to major thoroughfares, state and county highways, shall be prohibited.
(Ordinance 3-3-01, sec. 3.3, adopted 3/13/2001; 1997 Code, sec. 153.42)
(a) 
Residential.
Except as otherwise provided herein, a minimum setback shall be required on all residential lots as required by the zoning ordinance. For all residential lots in the extraterritorial jurisdiction, the required setback shall be equal to or greater than SF-2, single-family residential district -R7.0 regulations of the zoning ordinance.
(b) 
Commercial, industrial, and/or uses other than residential.
Except as otherwise provided herein, a minimum setback shall be required on all nonresidential lots as required by the zoning ordinance.
(Ordinance 3-3-01, sec. 3.4, adopted 3/13/2001; 1997 Code, sec. 153.43; Ordinance adopting 2023 Code)
The subdivider shall dedicate or grant easements as follows: Where necessary to adequately serve the subdivision with public utilities, easements shall be retained for poles, wires, conduits, storm sewers, sanitary sewers, water lines, open drains, gas lines, or other utilities. Such easements may be required across part of lots (including side lines), other than along boundary lines, if in the opinion of the planning and zoning commission, such easements are needed.
(Ordinance 3-3-01, sec. 3.5, adopted 3/13/2001; 1997 Code, sec. 153.44)
The subdivider shall be responsible for constructing paved streets and curbs and gutters within the subdivision, subject to the conditions contained herein.
(1) 
Arrangement.
Unless otherwise provided by the planning and zoning commission, provision shall be made for the extension of major streets through any new subdivision. Collector streets shall be provided as required by the commission for the circulation of traffic through the subdivision and the connection thereof to the major streets. Adequate minor streets shall be provided to accommodate the subdivision. Off-center street intersections with streets in adjacent subdivisions should be avoided. All major and collector streets shall be continuous or in alignment with existing streets unless variations are deemed advisable by the commission due to topography and requirements of traffic circulation.
(2) 
Plans and specifications.
(A) 
Plans and specifications for the required improvement shall be submitted to and approved by the city administration prior to the time the work on such improvements is commenced. Any improvement made shall be subject to the approval and acceptance of the city administration. The subdivider shall pay the entire cost of street improvements. Curbs and gutters shall conform to Class A concrete in accordance with state department of transportation standard specifications. All streets shall be surfaced with one of the surface types indicated below:
(i) 
Two inches or more of hot-mix asphaltic concrete (HMAC) Type D surface course (TxDOT Item 340) on six inches of crushed stone, Type A, Grade 2 (TxDOT Item 247) compacted to 100% theoretical maximum density as determined by ASTM D698 (standard Proctor) constructed on a prepared subgrade compacted to 95% theoretical maximum density as determined by ASTM D698 (standard Proctor). A minimum of four inches of the crushed stone base material shall extend under the curb and gutter.
(ii) 
A minimum of five inches of reinforced Portland cement concrete pavement meeting the requirements of TxDOT Item 360, Class A on a minimum six-inch lime stabilized subgrade compacted to minimum 95% of theoretical maximum density as determined by ASTM D698 (standard Proctor). Concrete aggregate shall be TxDOT Item 421, Grade 2 (ASTM C33 Grade 467). Reinforcing shall be minimum #4 bars (deformed) on minimum 18-inch centers, each way. The subgrade shall be stabilized with a sufficient amount of hydrated lime added to the material to reduce the plasticity index to less than ten (TxDOT Item 262). All lime stabilization shall extend under the curb and gutter to a point six inches back of the back of curb.
(B) 
All materials and constructions shall comply with the latest standards published by the state department of transportation.
(3) 
Width.
(A) 
Major streets shall have a minimum dedicated right-of-way of 80 feet and a minimum paving width of 60 feet.
(B) 
Collector streets shall have a minimum dedicated right-of-way of 60 feet and a minimum paving width of 40 feet.
(C) 
Minor to residential streets shall have a minimum dedicated right-of-way of 50 feet with a minimum paving width of 30 feet.
(D) 
Major streets having a right-of-way width of less than 100 feet shall be increased to a 100-foot right-of-way for a distance of 150 feet on either side of any intersection with another major street. The right-of-way shall be gradually and uniformly increased from the regular right-of-way width to the 100-foot width within an additional 150 feet.
(E) 
[Residential "estate type" streets:]
(i) 
A residential "estate type" street, meaning a two-lane street with drainage ditches on both sides, may be constructed in residential subdivisions with deed restrictions limiting lots to a minimum one acre in size or a minimum lot frontage of 150 feet.
(ii) 
The street shall have a minimum 60-foot right-of-way. The street shall have a crown of six to eight inches and a crown width of 36 feet consisting of a 26 feet wide, six inch depth crushed stone base material and a 24-foot wide surface treatment. The surface treatment shall be a two course penetration or one and one-half inch hot mix asphaltic concrete. The street shall meet all other city regulations.
(4) 
Curves.
Complete curve data (delta, length of curve, radius, point of curvature, point of reverse curvature, point of tangency) shown on the centerline or on each side of the street; length and bearings of all tangents and dimensions from all angle points of curve to an adjacent side lot line shall be provided.
(A) 
Major streets: Curves in major streets are to have a centerline radius of 1,000 feet or more. Exceptions to this standard may be granted only by the planning and zoning commission.
(B) 
Collector streets: Curves in secondary or collector streets are to have a centerline radius of 625 feet or more. Exceptions to this standard may be granted only by the planning and zoning commission.
(C) 
Minor streets: Curves in minor or residential streets are to have a minimum centerline radius of 60 feet.
(D) 
Reverse curves are to be separated by a minimum tangent of 50 feet.
(E) 
Street jogs and street intersections shall be no closer than 150 feet.
(5) 
Intersections.
(A) 
All streets, major, secondary, or minor, shall intersect at a 90-degree angle. A minimum 75-degree angle variation may be allowed, if approved by the planning and zoning commission.
(B) 
Each new street intersection with, or extending to meet, an existing street, shall be tied to the existing street on centerline.
(6) 
Culs-de-sac.
(A) 
Dead-end streets may be platted where the planning and zoning commission deems advisable and where the land being subdivided adjoins property not being subdivided, in which case, the streets shall be carried to the boundaries thereof. Streets designed to be permanently dead-end shall not be longer than 600 feet and shall be provided at the closed end with a paved cul-de-sac at least 80 feet in diameter on a street right-of-way of at least 100 feet in diameter.
(B) 
Temporary turnarounds are to be used at the end of a street more than 400 feet long that will be extended in the future. The following note must be placed on the plat: "Cross-hatched area is temporary easement for turnaround until street is extended (direction) in a recorded plat."
(7) 
Partial or half-streets.
Partial or half-streets may be provided where the planning and zoning commission feels that a street should be located on a property line.
(8) 
Street names.
New streets shall be named so as to provide continuity of name with existing streets and so as to prevent conflict with identical or similar names in other parts of the city.
(9) 
Street signs.
The subdivider shall furnish and install street signs for all intersections within or abutting the subdivision. The subdivider shall submit a list and graphical representation of all required signs as well as typical installation plans for staff review and approval prior to installation. The subdivider is strongly encouraged to provide such submittals with the preliminary and/or final plat.
(10) 
Private streets.
Private streets are prohibited.
(Ordinance 3-3-01, sec. 3.6, adopted 3/13/2001; 1997 Code, sec. 153.45)
(a) 
Pavement type.
All alleys shall be paved with materials conforming to street paving requirements.
(b) 
Width.
A minimum paved width of ten feet and a minimum right-of-way of 16 feet shall be required for all alleys.
(c) 
Drainage.
Adequate drainage shall be provided within the paved section or by swales to drain all lots to street without drainage easements through lots where possible. The depth of swale shall be as required for drainage with a minimum longitudinal slope of 0.5% toward a street or drainage easement.
(Ordinance 3-3-01, sec. 3.7, adopted 3/13/2001; 1997 Code, sec. 153.46)
Sidewalks shall be required and shall be a minimum of four feet wide. Sidewalks abutting the back of curb or within two feet of back of curb shall be a minimum of six feet wide. All sidewalks shall have a traverse [transverse] slope of one-eighth inch per foot.
(Ordinance 3-3-01, sec. 3.8, adopted 3/13/2001; 1997 Code, sec. 153.47)
Street lighting shall be provided by the developer and shall conform to the latest edition of the Illuminating Engineering Society Handbook. Lighting levels shall be as recommended for very light traffic in residential areas; medium traffic on feeder streets; and heavy traffic on thoroughfares.
(Ordinance 3-3-01, sec. 3.9, adopted 3/13/2001; 1997 Code, sec. 153.48)
(a) 
Subdivider's responsibilities.
The purpose of this section is to establish minimum standard criteria for design of water distribution systems. The subdivider shall provide all water lines necessary to properly serve each lot of the proposed subdivision, and ensure that existing and/or new water facilities can supply the required demand for domestic use and for fire protection at the desired pressure. The subdivider shall install all mains and shall extend service to all lots terminating thereon with a curb stop. The subdivider shall submit certification to the city that the system has been designed in accordance with the current, applicable requirements of the state commission on environmental quality, the city, and any other rules or regulations promulgated by an appropriate governing agency.
(b) 
Testing reports.
The engineer responsible for the design of the proposed improvements shall submit testing reports performed by the engineer of an independent testing laboratory with a verification statement to the director of public works that the improvements have been constructed in accordance with the approved plans and specifications.
(c) 
Line size.
The minimum pipeline size to serve residential areas shall be six inches in diameter and the minimum pipeline size serving commercial, business, industrial, and multifamily shall be eight inches. In general, all water lines shall be looped with no dead-ends, unless otherwise approved by the city. Dead-end lines shall be provided with a flush valve or fire hydrant at the end. Dead-end lines shall not exceed 500 feet in length without prior approval of the city. Pipelines shall be sized to provide sufficient supply for fire flows in accordance with the minimum criteria of the state commission on fire protection and other governing authorities.
(d) 
Pipe material.
Water pipelines shall be either ductile iron (polywrapped), polyvinyl chloride (PVC), or concrete cylinder. In general, all water pipelines shall be minimum Class 150. PVC pipe shall meet the requirements of AWWA C-900, Class 150 (DR 18). Ductile iron pipe shall be a minimum Class 50 with a cement mortar liner. All service lines shall be Type "K" copper tubing. All pipe shall be new and approved by the Underwriters' Laboratory and shall be acceptable to the state commission on fire protection for use in water distribution systems without penalty. PVC water pipe shall also bear the seal of approval of the National Sanitation Foundation Testing Laboratory (NSF) for potable water pipe.
(e) 
Fittings.
All fittings shall be cast iron or ductile iron (polywrapped) and shall comply with American Water Works Association Standard Specification AWWA C110, AWWA C111 or AWWA C153. Below-grade fittings shall be mechanical joint. Adequate thrust blocking shall be provided at all fittings. Above-grade fittings shall be flanged joints. Concrete cylinder pipe fittings shall be of the same material as the pipe. All fittings shall have a pressure rating equal to that of the pipe, but in no case shall be less than 150 psi. All copper fittings shall be compression fittings. No flare fittings shall be permitted.
(f) 
Fire hydrants.
(1) 
In general, fire hydrants shall be located at each street intersection and at intervals on the interior of each block. Spacing of fire hydrants in single-family residential areas shall not be over 500 feet apart along the street. Spacing of fire hydrants in the commercial, industrial or high-density residential areas shall not be over 300 feet apart along the street. In all cases, the fire hydrant shall be within 500 feet of any portion of a building. If special conditions exist, the fire marshal may require additional hydrants for fire protection.
(2) 
All fire hydrants shall be installed on a minimum six-inch main. There shall be a gate valve installed between the main and hydrant. Fire hydrants shall be located between five and six feet back of the curb.
(3) 
Fire hydrants shall be iron body, bronze mounted throughout, and shall be designed for a minimum working pressure of 150 psi. All fire hydrants shall be three-way feed with one pumper nozzle of 4.5 inches and two hose nozzles of 2.5 inches. The operating nut shall be a 1.5 inch pentagonal and shall open by turning to the left (counterclockwise). Threads shall be compatible with existing fire department equipment.
(4) 
Fire hydrants shall be painted to meet the city's requirement for color code. In general, the developer shall furnish hydrants that have base and bonnet painted with a red paint. After the city performs the fire flow tests on the hydrant, the city will paint the bonnet with a color which corresponds to the flow on which it is located as shown in the following table:
Fire Hydrant Color Code
Main Flow Capacity
Color of Bonnet & Caps
0 - 500 gpm
Red
500 - 1,000 gpm
Blue
Greater than 1,000 gpm
Green
(g) 
Gate valves.
(1) 
All gate valves shall be resilient seat gate valves. All gate valves 16 inches and larger shall be furnished with bypass valves. For valves 16 inches and larger, butterfly valves may be used as an alternative to gate valves. Any proposed alternative valves shall be submitted to the director of public works for approval prior to installation. Valves shall open by turning counterclockwise and shall have a two-inch operating nut.
(2) 
In general, gate valves shall be located at intersections to allow the isolation of line for repairs. Valves shall be placed so that not more than five lots will be out of service while a line is shut down for repair. All valves shall be installed in the vertical position with a valve box and cover centered over the stem. A two-foot square and six-inch thick concrete pad shall be constructed around the top of the valve box.
(h) 
Testing and sterilization.
(1) 
All water pipelines shall be hydrostatically tested. The test shall include service lines, fire hydrants, flush valves, etc., and all testing shall be accomplished in the presence of a representative of the city. The developer shall be responsible for all expenses required to hydrostatically test the pipelines.
(2) 
All facilities shall be flushed and sterilized. The developer will be required to submit samples to an approved laboratory for certification as being free of bacteria. The developer shall be responsible for sterilization and resterilization as necessary and all associated expenses. This shall be performed in the presence of a representative of the city.
(i) 
Location and installation.
(1) 
All water mains shall be located four feet behind the curb on the north/east side of the street. Installation shall be at the line and grade as shown on the plans. The mains shall have a minimum of 48 inches of cover in open areas. Water lines under existing streets and proposed streets shall have a minimum cover of 48 inches from the finish grade of proposed pavement. Special attention shall be given to water lines in unimproved streets in order to provide for the future grading of those streets.
(2) 
Water lines shall be embedded and backfilled. For trenches located in streets the backfill shall be compacted to a minimum of 95% Standard Proctor density.
(3) 
All bends, fittings, etc., shall have concrete thrust blocking provided. A tracer line shall be installed in conjunction with all installations and shall be terminated at each valve location. The tracer line shall be installed 12 inches above the pipe and shall be a 10-gauge insulated, colored blue.
(Ordinance 3-3-01, sec. 3.10, adopted 3/13/2001; 1997 Code, sec. 153.49)
(a) 
Purpose.
The purpose of this section is to establish minimum standard criteria for design of sewer systems.
(b) 
Testing reports.
The engineer responsible for the design of the proposed improvements shall submit testing reports performed by the engineer of an independent testing laboratory with a verification statement to the director of public works that the improvements have been constructed in accordance with the plans and specifications. The subdivider shall certify that the sanitary sewer improvements have been approved by the state commission on environmental quality, the city and any other appropriate governing agency that has promulgated rules or regulations for sanitary sewer systems.
(c) 
Pipe size and grades.
The minimum line size shall be six inches in diameter. Sanitary sewer lines shall be designed to have a minimum mean velocity flowing full of 2.0 feet per second (fps). The minimum slope of the sewer lines shall conform to the minimums recommended by the state commission on environmental quality and the maximum velocity shall not exceed ten fps.
(d) 
Pipe material.
(1) 
Sanitary sewer pipe shall be polyvinyl chloride pipe (PVC) SDR 35 with SDR 26 utilized for depths greater than eight feet. PVC pipe shall meet the requirements of ASTM D3034. Sanitary sewer pipe and fittings shall be PVC with rubber gasket type, bell and spigot joints.
(2) 
All pipe shall be new and approved by the Underwriters' Laboratories, Inc., and the PVC pipe shall also bear the seal of approval of the National Sanitation Foundation Testing Laboratory (NSF).
(e) 
Manholes.
(1) 
Manholes shall be located at all intersections of sewer pipelines, changes in grade, changes in alignment, and at distances not to exceed 500 feet. Manholes shall be constructed of precast reinforced concrete pipe, cast-in-place concrete, or fiberglass. Brick manholes will not be allowed. Watertight, size on size resilient connectors allowing for differential settlement shall be used to connect pipe to manholes. Pipe to manhole connectors shall conform to ASTM C-923.
(2) 
All manholes shall have 24-inch standard manhole rings and covers. Manhole rings and covers in areas subject to vehicular traffic shall be rated for H20 loading. Covers shall have pick bars and the words "sanitary sewer" visible in the casting. Watertight rings and covers shall be furnished in areas subject to flooding and installed in accordance with state commission on environmental quality regulations.
(f) 
Drop manholes.
Drop manholes shall be used at locations where the elevation of the incoming sewer line is two feet or greater from the elevation of the outgoing line. Construction shall be the same as the standard manhole. The drop piping shall be PVC pipe. Inside or outside drops will be permitted.
(g) 
Cleanouts.
Cleanouts shall be constructed at the upper end of all sewer mains. Cleanouts shall be constructed of the same material and same size as the sewer main with a plug. The top shall have a cast iron boot with cover. A two feet by two feet by six inches thick concrete pad shall be placed around this boot.
(h) 
Services.
Services shall be provided for each lot, tract, parcel, or subdivided property. Minimum service shall be four inches in diameter. Services shall be located five feet upstream of the downstream property line. Each service shall be provided with a cleanout at the property or easement line.
(i) 
Force main.
Force main materials and installation shall be in accordance with all state commission on environmental quality regulations.
(j) 
Lift stations.
Lift stations shall be designed in accordance with the criteria of the state commission on environmental quality. Design data will be submitted to the city and the state commission on environmental quality and approved on a case-by-case basis.
(k) 
Testing.
(1) 
All sewer pipe shall have deflection tests performed on them. This test shall be conducted after the final backfill has been in place at least 30 days. No pipe shall exceed the manufacturer's recommended deflection. Tests shall be performed using a properly sized "go -no go" mandrel.
(2) 
All sewer lines shall be tested for infiltration/exfiltration. The method of testing the pipe shall be by using the "Low-Pressure Air Test." All manholes shall be tested by using vacuum or hydrostatic methods in accordance with city standard specifications. All testing shall be conducted in the presence of a city representative. All expenses for this work shall be the developer's responsibility.
(l) 
Location and installation.
(1) 
All sewer mains shall be constructed on the opposite side of the street from the water mains. Sewer mains shall be constructed to the line and grade as shown on the plans. Manholes shall be located at lot lines whenever possible. The sewer line shall be located four feet from the centerline of proposed pavement. Manholes shall not be located in the bottom of drainage channels.
(2) 
Manholes shall be located in the maintenance strips provided.
(3) 
Sewer lines shall be embedded and backfilled. For trenches located in streets, the backfill shall be compacted in minimum six inch lifts to a minimum of 95% Standard Proctor density.
(4) 
A tracer line shall be installed with PVC pipe and be terminated in each manhole. The tracer line shall be installed 12 inches above the pipe and shall be a 10-gauge insulated green wire.
(5) 
All subdivisions shall be provided with a sewage disposal system approved by the state commission on environmental quality.
(Ordinance 3-3-01, sec. 3.11, adopted 3/13/2001; 1997 Code, sec. 153.50)
(a) 
General storm sewer standards.
An adequate storm sewer system consisting of inlets, pipes, and other underground and above-ground drainage structures with approved outlets shall be constructed where the runoff of storm water and the prevention of erosion cannot be accomplished satisfactorily by surface drainage facilities. The storm sewer system shall comply with all applicable EPA and state commission on environmental quality rules, regulations and requirements. The filing of all applicable construction notices shall be the responsibility of the developer and/or contractor.
(b) 
Design criteria.
Data shall be submitted as directed in this section for storm drainage installation for the city. All subdivision development shall be subject to these criteria. Drainage problems will be solved by the use of the "rational method" assuming full development of the watershed where appropriate.
Formula: Q = CIA; where:
Q = The storm flow at a given point in cubic feet per second (cfs);
C = A coefficient of runoff representing the ratio of rainfall to peak runoff;
I = The average intensity of rainfall in inches per hour for a period equal to the time of flow from the farthest point of the drainage area to the point under consideration (developed from Technical Paper No. 40, "Rainfall Frequency Atlas of the United States," May 1961 by the U.S. Weather Bureau);
A = The area in acres that is tributary to the point of design.
(1) 
Minimum inlet time.
(A) 
Residential: 15 minutes.
Industrial: 10 minutes.
Commercial: 10 minutes.
(B) 
Water is assumed to be 8 inches deep with an 8-inch curb on a 30-foot street with a 6-inch crown and 6 inches deep with a 6-inch curb on a 30-foot street with a 5-inch crown. Where curb elevations are split, the carrying capacity shall be adjusted according to recognized engineering procedures. Wider streets shall be treated in a similar manner.
(2) 
Runoff coefficient.
Commercial:
0.80
Industrial:
0.70
Residential:
0.50 (lot area less than 1.0 acre)
 
0.35 (lot area equal to or greater than 1.0 acre)
Parks:
0.30
Apartments:
0.75
(3) 
Design frequency.
(A) 
For major drainage courses and underpasses, use 100-year storm expectancy.
(B) 
For total capacity of any street, swale, or waterway, use 100-year storm expectancy with level of total capacity of waterway below finished ground at building foundations.
(C) 
Use 5-year storm expectancy for normal gutter or combined gutter and storm drain capacity. Culverts and bridges shall be designed to carry the 100-year frequency storm.
(c) 
Design.
Design of storm sewers, outfalls, culverts, and drainage channels shall conform to the following requirements:
(1) 
Manholes.
(A) 
Manholes shall be located at intervals not to exceed 500 feet for pipe 24 inches in diameter or smaller. Manholes shall preferably be located at street intersections, junctions, changes of grades and changes of alignment.
(B) 
Manholes for pipe greater than 24 inches in diameter shall be located at points where design indicates entrance into the pipe is desirable; however, in no case should the distance between openings or entrances be greater than 1,000 feet.
(2) 
Pipe.
Pipe for storm drains shall be concrete pipe in sizes as shown on the approved plans. Pipe 21 inches or larger in diameter shall be reinforced concrete pipe (RCP), ASTM C76, Class III. Where, in the opinion of the city, added strength of pipe is needed for traffic loads over minimum cover or for excessive height of backfill, concrete pipe shall be ASTM C14 Extra Strength or ASTM C76, Class IV or Class V. Pipe shall have a minimum cover of not less than one foot over the top of pipe.
(3) 
Channels.
Drainage channels, when approved by the planning and zoning commission, may be used for outfalls to natural or major drainage channels. Where practicable, unpaved channels should have sufficient gradient, depending on the type of soil, to provide velocities that will be self-cleaning but will not be so great as to create erosion. Paved channels, drop structures, ditch checks or paved spillways may be required to control erosion that results from the high velocities or large volumes of water on steep grades. Side slopes shall not be steeper than 2:1.
(Ordinance 3-3-01, sec. 3.12, adopted 3/13/2001; 1997 Code, sec. 153.51)
(a) 
Monuments, consisting of one-half inch iron pipe or one-half inch reinforced steel or larger, 24 inches in length, shall be placed at all corners of the block lines, and at the points of intersection of curves and tangents of the subdivision.
(b) 
At least one benchmark for each subdivision shall be permanently installed in an approved manner, with the location and the elevation as shown on the plat. Permanent benchmarks shall be five feet long concrete posts six inches in diameter with the top to be at least 12 inches below finished grade.
(c) 
Lot markers shall be metal, at least 24 inches in length, placed at each corner of all lots, flush with the average ground elevation, or they may be countersunk, if necessary, to avoid being disturbed.
(Ordinance 3-3-01, sec. 3.13, adopted 3/13/2001; 1997 Code, sec. 153.52)