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City of El Reno, OK
Canadian County
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Table of Contents
Table of Contents
[HISTORY: Adopted by the City Council of the City of El Reno 9-1-1972 as Ch. 12 of the 1972 Code; amended in its entirety 7-7-1992 by Ord. No. 2678. Subsequent amendments noted where applicable.]
GENERAL REFERENCES
Building construction — See Ch. 142.
Property maintenance — See Ch. 264.
Subdivision of land — See Ch. 312.
Zoning — See Ch. 361.
All subdivision of land, developments or improvements to any land in the corporate limits of the City, as now and as may be hereafter established, shall be subject to all provisions of this chapter.
The terms set forth in this chapter shall be given the meanings indicated below unless the content clearly requires a different meaning:
APPLICANT
A person, partnership, corporation or public agency requesting permission to engage in construction.
CONSTRUCTION
Any alteration of land for the purpose of achieving its development or changed use, including particularly any preparation for, building of or erection of a structure.
DETENTION
A temporary storage of determined quantity of water for a specified period of time with a release rate that is either fixed or variable; releasing stormwater into a downstream drainage system during the storm.
DEVELOPER
Any person, persons, corporation or other entity who or which, in his or her or its own behalf, or as an agent of another, engages in development, subdivision, construction of structures or alteration of land in preparation therefor.
DRAINAGE SYSTEM
The surface and subsurface system for the removal of water from the land, including both the natural elements of streams, marshes, swales and ponds, whether of an intermittent or continuous nature, and the man-made element which includes culverts, ditches, channels, retention facilities, detention facilities, gutters, streets and storm sewer systems.
MINOR MAINTENANCE
Any maintenance activity for the maintenance of a drainage system, specifically excluding repair or replacement of paved channel liners, replacement of revetments or riprap, or replacement of soil lost due to meandering of a channel. Minor maintenance includes, but is not limited to, mowing, replacement of vegetation, and filling of erosion gullies.
NATURAL DRAINAGE
The dispersal of surface waters through ground absorption and by drainage channels formed by the existing surface topography which exist at the time of the adoption of this chapter or formed by any natural or approved man-made changes in the surface topography.
RETENTION
Long-term storage of stormwater runoff and controlled release of this runoff during and/or after a flood or storm.
It is the purpose of this chapter to set forth the minimum requirements necessary to provide and maintain a safe, efficient and effective stormwater management system within the City and to establish the various public and private responsibilities for the provision thereof with the least possible disruption of the natural drainage system and of the environment.
A. 
It shall be the responsibility of any individual engaged in the activity of land subdivision, development or improvement to:
(1) 
Control and manage all drainage from the subdivision resulting from the development, including the control and management of any determined, approved increase in runoff or runoff rate.
(2) 
Prepare all drawings, plans, specifications, statements, studies, justifications and other data required by this chapter in a form that permits an orderly and comprehensive review and approval to assure that all assigned responsibilities have been sufficiently and correctly incorporated.
(3) 
Control and manage all stormwater runoff and drainage from points and surfaces within the subdivision.
(4) 
Provide detention or retention facilities or storm sewer, or improved or natural channels, or a combination thereof to provide control and management of increased discharge.
(5) 
Prevent soil dispersal, sedimentation, erosion or other similar forms of pollution:
(a) 
From any surface of the site into drainage channels provided or created within the development.
(b) 
From the site into drainage channels adjacent to and remote from the site.
(6) 
Prevent any and all drainage interferences, obstructions or other adverse effects upon drainage into, through or adjacent to the development from upstream or higher elevation source by the use of temporary or permanent bypass channels, channel improvements or other facilities as may be required.
(7) 
Improve or modify any and all drainage systems and channels lying within or adjacent to the subdivision to a level that meets all requirements of this chapter.
(8) 
Improve or modify drainage systems downstream from the subdivision to a level that will accommodate all allowable, significant increases in stormwater quantity or rate without adverse effect and in accordance with the requirements of this chapter.
(9) 
Fully consider and provide natural drainage in the design of drainage systems and classifications applicable to the development.
(10) 
Prepare and submit a professional evaluation of the impacts of proposed development.
(11) 
Maintain all installed drainage facilities in a clean, fully functioning manner, from installation through final acceptance by the City.
(12) 
Prevent any contribution to existing flooding, drainage, erosion, runoff, pollution or other stormwater management problems with an area already under a high level of development.
(13) 
Prevent drainage, runoff, flooding or problems associated with any adverse contribution to any such potential problems.
B. 
It shall be the responsibility of all owners of property, whether undeveloped, developed or undergoing development, to:
(1) 
Mow and provide minor maintenance of drainage channels and their slopes for that portion of the channel lying within their property line.
(2) 
Keep clear all drainage channels within the boundaries of their properties in accordance with the requirements of this chapter.
(3) 
Control all stormwater runoff and drainage from points and surfaces on the property.
(4) 
Prevent any and all drainage interferences, obstructions, blockages or any other adverse effects upon drainage into, through or out of the property.
C. 
It shall be the responsibility of the City to:
(1) 
Repair and maintain drainage channels and their slopes when located within or upon rights-of-way dedicated to the City.
(2) 
Develop and implement standards and specifications required to clearly and accurately interpret the physical requirements of this chapter.
(3) 
Make such necessary improvements of primary and secondary drainage channels that cannot or will not be improved through private development.
(4) 
Improve and maintain floodway and flood fringe areas that are dedicated public areas, rights-of-way, park lands or public-owned buildings or developments.
(5) 
Improve and maintain all public-owned drainage channels or systems outside the flood fringe area.
D. 
It is the intent of this chapter that the following principles shall be used in the design of modifications to or the improvement of the stormwater management system.
(1) 
Natural drainage channels and techniques shall be given priority consideration in preparation of drainage system designs and shall be designed or improved as an integral part of the landscape of the area and shall be kept in good repair.
(a) 
The design of any development shall provide for the maximum use of open channels and natural streams for flows and detention or retention storage of volumes and flows in excess of those present prior to development.
(b) 
Drainage channel improvements shall be developed and designed that preserve and protect large trees and other worthy botanical and geological features to the greatest possible extent.
(c) 
Wherever channel improvements are required to accommodate calculated flows in a specified manner, the designs shall provide maximum utilization of turf, sodding and other natural drainage techniques.
(2) 
Closed, underground drainage conduits shall be employed only when there is no viable alternative to fit site or geographic conditions or to meet the requirements of this chapter and all specifications and performance standards pertaining thereto.
(3) 
The rate of runoff after development shall not exceed that rate experienced before development.
(a) 
In no case shall the release rate of stormwater runoff from all developments in a drainage area, controlled or uncontrolled, exceed the "safe" storm drainage capacity of the downstream outlet channel(s) or storm drainage system as determined by the City.
(b) 
Within already developing or developed areas where "safe" storm drainage capacity of a downstream outlet channel(s) or storm drainage system has been exceeded, the developer shall add no increased runoff unless the downstream outlet capacity has been increased to accommodate all flows.
(c) 
Improvements may be required in channels or sewers flowing into, through or from the subdivision or development, or in channels or sewers located upstream or downstream that are affected by the flow of water from the subdivision, development or change thereto. The following types of improvements, among others not specifically listed, may be required:
[1] 
Enlargement or replacement of undersized structures.
[2] 
Removal of obstructions.
[3] 
Straightening, widening and/or deepening of channels.
[4] 
Construction of erosion and sedimentation facilities.
[5] 
Construction of closed or open, paved or natural drains for the purpose of closing gaps or maintaining the continuation of the overall stormwater drainage system.
[6] 
Detention or retention facilities.
[7] 
Improvements as otherwise required by this chapter to assure efficient and safe stormwater management.
(d) 
When subdivision development or property improvements will result in an increased runoff beyond the boundaries of the development or improvement which cannot be accommodated through channel improvements without flooding or potential flooding upstream or downstream, the City or the Planning Commission shall require the construction of one or more detention or retention facilities on the subdivision or property being improved, and/or required detention or retention techniques to be used off-site which will result in flows, during construction and thereafter, from the property at a rate and volume no greater than the discharge from the undeveloped site.
(4) 
All those engaged in land improvements or modifications shall prevent the erosion of soil and movement of sedimentation into, onto or through streets, gutters, catch basins, culverts or other drainage channels and shall prevent erosion as a result of flows from streets, gutters, culverts or other drainage channels.
(a) 
Where it can be demonstrated that there is no alternative to rapid runoff water because of identifiable restrictions, the developer shall be required to provide measures to prevent erosion, damage, flooding or other adverse effects.
(b) 
The City shall require the cleaning, straightening and/or repair of any natural drainage channel or natural features of other drainage channels when necessary to provide for the free flow of water or to eliminate and/or prevent erosion upstream and downstream.
(5) 
The City may approve stormwater runoff into a street or alley, provided that the developer fully and adequately demonstrates that the street or alley or any improvement thereof will provide drainage in full conformance with all other provisions of this chapter and which will prevent runoff or overflow into adjacent or nearby residential property.
E. 
It is the further intent of this chapter that the following requirements be met to ensure the least possible disruption to the existing drainage system:
(1) 
Detention and retention, separately or in combination, shall be considered and incorporated, where possible, in all drainage system design consistent with safety, convenience and restrictions placed upon stormwater runoff rates and velocities for the developments, property and drainage channels through or therefrom.
(2) 
The City may require improvements, provision of drainage easements and for the provision of improvements, agreements and/or easements beyond the boundaries of the subdivision, development or property improvement to facilitate flow of stormwater from or through the property, to avoid damage from changed runoff conditions, to provide continuous improvement of the overall storm drainage system, and to accommodate all drainage conditions or requirements. Where stormwater runoff flows require the logical extension of any street and its associated drainage in order to prevent flooding, ponding or uncontrolled runoff, the extension shall be provided by the developer.
(3) 
Improvements provided by the developer shall be fully and properly maintained from initial approval of installation(s) through final acceptance of the development improvements by the City. The continuing maintenance of detention or retention facilities shall be assured by the developer in the manner described for other drainage facilities.
(4) 
No action shall be taken in any land improvement by any developer, contractor or lot owner that will alter or otherwise change designed and installed stormwater management control, nor shall any action be taken on existing property that shall adversely affect stormwater runoff in any manner contrary to the provisions of this chapter. Whether temporary in nature to service only the construction phase of development, or whether a combination of temporary and permanent serving a dual purpose, the first techniques to be employed in the development of a site shall be the management of stormwater and drainage in manner consistent with the requirements of this chapter.
F. 
Exceptions.
[Added 11-7-2006 by Ord. No. 4028]
(1) 
A fee-in-lieu of on-site stormwater detention may be allowed under the following circumstances:
(a) 
The total area of the lot being developed does not exceed 1.5 acres.
(b) 
The lot lies adjacent to and abuts a creek, river, other tributary or floodplain.
(c) 
Such action will have no material adverse effect upon the efficiency of the water flow capacity or water detention storage capacity of any floodplain or floodway.
(d) 
The City Engineer has approved a formal appeal filed with the Community Development Department that includes the following:
[1] 
A written statement as to why on-site detention would not be pragmatic and why relief is being sought.
[2] 
A plot plan drawn to scale showing location, property dimensions and all proposed construction or development, including all impervious surfaces.
[3] 
A summary showing the total square footage of all impervious surfaces.
[4] 
A nonrefundable application fee as approved by City Council.
(2) 
Fees to be accepted shall be tendered prior to the issuance of a building permit. Should the impervious surfaces on a given property at the time of application for an occupancy or use permit be less than that stated on the building permit, then the permittee may request that the permittee fees be recalculated, the excess fees refunded to the payee and the building permit amended. Should the impervious surfaces on a given property be greater than stated on the building permit, additional fees shall be due pursuant to a recalculation of the fees and must be tendered before any occupancy or use permit may be issued.
(3) 
"Impervious surface" shall mean any hard-surfaced areas which prevent or retard the entry of water into the soil in the manner and to the extent that such water entered the soil under natural conditions, or where water is caused to run off the surface in greater quantities or at an increased rate of flow than was present under natural conditions. Impervious surfaces shall include, but are not limited to, rooftops except roof overhangs; sidewalks; paving; driveways; parking lots; walkways; patio areas; storage areas; and asphalt, concrete, gravel, oiled macadam or other surfaces which similarly affect the natural infiltration or runoff patterns of real property in its natural state.
(4) 
Impervious surface installed or constructed as a part or portion of a public street or a private or public sidewalk in the public street right-of-way shall not be calculated as a part of the fee collected in lieu of on-site detention.
(5) 
Fees accepted shall be deposited in a separate fund identified by the drainage basin where the development is occurring. Fees shall be utilized for the costs and expenses incurred or to be incurred in constructing or reconstructing physical improvements to prevent, reduce, eliminate or attempt to eliminate, prevent or reduce the known or projected flooding problems in the watershed of the subject property.
(a) 
The fees in lieu of on-site detention shall be in the amounts established by Council by resolution under advisement of the Municipal Planning Commission.
(b) 
As used in this section, the fees tendered hereunder shall be deemed accepted when the City Treasurer receives the funds required.
(c) 
Whenever a property upon which an impervious surface is installed or constructed lies within two different watersheds, the fees shall be proportionately applied based upon the amount of impervious surface within each watershed. Whenever a property upon which an impervious surface is installed or constructed lies within a watershed requiring on-site detention facilities, or fees in lieu thereof, a fee shall be accepted and applied based upon the amount of impervious surface within the watershed so requiring.
(d) 
It is unlawful for any person to erect, construct, install, enlarge, alter, repair, move, improve, make, put together, or convert any building, structure, improvement, facility, or impervious surface within the City, or cause the same to be done, without first paying a fee in lieu of detention required by this section or by providing stormwater detention in accordance with this chapter.
(e) 
The number of square feet of impervious surface installed or constructed shall be established as follows:
a = b - c
a
=
The number of square feet of impervious surface for which the applicant must pay a fee.
b
=
The total square feet of impervious surface at the property as set forth in the new building permit or any recalculation thereof as provided in Subsection F(3)
c
=
The total square feet of impervious surface on the existing building permit, if any, for the property on the effective date of this section or such subsequent building permit appropriately issued, whichever reflects the greater total square feet of impervious surface already authorized said property.
G. 
If any determination based upon the provisions of Subsection F is felt to be unreasonable or inapplicable, a developer or lot owner may appeal that determination to the Planning Commission. Upon written request for the appeal, which shall include all justifications and reasons for that appeal, the question will be heard at the next available meeting of the Planning Commission.
[Amended 11-7-2006 by Ord. No. 4028]
[Amended 11-3-1992 by Ord. No. 2697]
A. 
Preliminary plats submitted for review and approval shall be accompanied by the following documents, which shall be submitted to the City:
(1) 
Five copies of a predevelopment report accurately describing:
(a) 
Dimensions, size and location.
(b) 
Existing topography.
(c) 
Soil types.
(d) 
Vegetation.
(e) 
Flood hazard areas.
(f) 
Other significant surface features.
(g) 
Existing land use.
(h) 
Existing runoff volume.
(i) 
Existing runoff rates.
(j) 
Existing runoff routing.
(2) 
Five copies of a plan for the control of erosion and sedimentation which shall contain:
(a) 
Data showing the nature and extent of the proposed clearing, grading and development or improvement operations.
(b) 
An estimate of soil loss during and after development.
(c) 
Proposal for the control of erosion and sedimentation during and after development, including a statement of actions proposed to assure erosion control for all areas of the site that will be unprotected for long periods or during peak rainy periods and for natural drainageways prior to and during construction.
(d) 
Proposed topography of the site after development or improvement, including the method of handling runoff and stormwater.
(3) 
A written statement of the impact on upstream and downstream drainage prepared by a registered professional engineer and approved by the City. The accuracy and validity of any drainage impact statement and attachments shall be capable of withstanding serious challenge at any stage in the review and approval process in order to be accepted as a part of the project. Accordingly, the alleviation of adverse impacts by on-site and off-site improvements relating to the drainage are of important concern and shall be satisfactorily provided as required by this chapter.
(4) 
A description of proposed easements and/or rights-of-way, and the provision of binding agreements between cooperating developers for drainage improvements required outside of subdivision development boundaries. Public easements and right-of-way dedications shall be initiated by the developer, property owner planning property improvements or legal agent thereof, shall be prepared in the manner prescribed by law, and shall be submitted in accordance with the timing and routing requirements of this or other applicable chapters.
B. 
Final plats submitted for review and approval shall be accompanied by the following documents, which shall be submitted to the City:
(1) 
All documentation required by Subsection A above.
(2) 
Improvement plans meeting the requirements of this section.
C. 
Any person applying for a building permit or who otherwise intends to make changes in the contour of any land shall first submit the following documents to the City:
(1) 
All documentation required by Subsection A above, allowing that, at the direction of the City, the documentation need not be prepared by a professional engineer.
(2) 
Plans for improvement or changes proposed, including site plans, plot plans and building drawings for buildings and structures, clearly showing the method of handling rainfall runoff and stormwater.
D. 
The following activities are specifically exempted from the requirements of this section:
(1) 
Bona fide agricultural or forestry operations.
(2) 
Home gardening or other minor clearing or excavation work not incident to a change in the residential use of the land.
(3) 
Emergency repairs necessary for the preservation of life, health or property.
(4) 
Routine maintenance or repair work on public or private roads and rights-of-way or utility line easements and rights-of-way.
(5) 
Changes that would occur on single-family residential lots.
E. 
All plans and documentation required by this section must comply with all City standards, regulations, ordinances and with the approved drainage master plan or drainage studies.
F. 
All documentation and plans required by this section must be approved by the City prior to their implementation. The City may submit any documents to the following agencies for their review and comment prior to the City's approval:
(1) 
The City of El Reno Department of Community Development.
(2) 
The City of El Reno Public Works Department.
(3) 
The United States Soil Conservation Service.
G. 
Appeals of the decision or requirements made as a result of this review, other than for improvement plans requirements, may be made to the City Planning Commission.
H. 
Projects and tasks proposed in the plans and documents required by this section shall be implemented as proposed. Any changes or amendments to the plans or documentation must be approved by the City in accordance with the established review procedures.
A. 
Purpose. This section shall define the methods, performance, standards and design criteria which shall be used in the preparation and evaluation of the reports and plans required as documentation in § 194-4.
B. 
Drainage calculations.
(1) 
Flow rates. The calculation of runoff rates shall be calculated by the rational formula using antecedent precipitation factors:
Q = C Ca I a
Where
C = Runoff coefficient
I = Intensity of rainfall in inches per hour
A = Drainage area
Ca = Antecedent precipitation factor
Acceptable Ca coefficients are as follows:
Storm recurrence interval
(years)
Ca
2 to 10
1.0
25
1.1
50
1.2
100
1.25
The product of C x Ca must not exceed 1.0.
"C" coefficients according to description of drainage area:
Description of Area
Runoff Coefficients
Downtown Business
0.70 to 0.95
Neighborhood Residential
Single-family
0.50 to 0.70
Multi-units, detached
0.30 to 0.50
Multi-units, attached
0.40 to 0.60
 Residential (suburban)
0.60 to 0.75
Apartment
Industrial
Light
0.50 to 0.80
Heavy
0.60 to 0.90
Parks, cemeteries
0.10 to 0.25
Playgrounds
0.20 to 0.35
Railroad yard
0.20 to 0.35
Unimproved
0.10 to 0.30
"C" Coefficients according to character of surface:
Character of Surface Pavement
Runoff Coefficients
Asphaltic and concrete
0.70 to 0.95
Brick
0.70 to 0.85
Roofs
0.70 to 0.95
Lawns, sandy soil
Flat, 2-percent slope
0.05 to 0.10
Average, 2- to 7-percent slope
0.10 to 0.15
Steep, 7-percent slope
0.15 to 0.20
Lawns, heavy soil
Flat, 2-percent slope
0.13 to 0.17
Average, 2- to 7-percent slope
0.18 to 0.22
Steep, 7-percent slope
0.25 to 0.35
Acceptable formulas for determining time of concentration are as follows:
Time = K (L.37 / S.2)
where
L
=
Length of flow in feet
S
=
Average slope in feet/foot
K
=
Constant for character of surface
Values of K:
Values of K:
Pavement
0.372
Commercial
0.445
Bare soil
0.604
Residential
0.511
Poor grass
0.90
Cultivated soil
0.775
Average grass
1.00
Timber; thin grass
0.942
Dense grass
1.13
Pasture
1.040
An acceptable formula for channel flow is:
Time = K (L.2 / S.385)
Values of K:
Values of K:
Curbed street
0.0035
Straight; clean stream
0.00592
Concrete lined channel
0.006
Average stream
0.00835
Sodded swale
0.008
Meandering; pooling stream
0.01020
Bar ditch
0.012
An acceptable formula for intensity is as follows:
I
=
a
(td + b) c
I = Average rainfall intensity, inches per hour
td = Rainfall duration (or concentration time), minutes
Storm return
2-year
5-year
10-year
25-year
50-year
100-year
a
=
56.43
72
82
95
108
120
b
=
11.5
c
=
0.810
b = 15
c = 0.80
Where td = Time of concentration
(1)
Rational method analysis: Practices in Detention of Urban Stormwater Runoff, American Public Works Association, Special Report No. 43.
(2)
Stormwater flood routing techniques.
(2) 
Flow volumes. The calculation of runoff flow volumes used in the sizing of detention or retention facilities or other flood routing analysis shall be done by the use of accepted stormwater routing principles and the method shall be approved by the City.
(3) 
Structure sizing. The sizing of all drainage facilities or structures shall be done by the use of established available engineering principles and practices, and the methods shall be acceptable to the City.
(a) 
The structure sizing shall include an analysis of the existence of inlet or outlet control design, freeboard, spillway design and a backwater analysis where applicable.
(b) 
Where Manning's Equation is used, the value for coefficients will be taken from the following references:
[1] 
Open channels:
[a] 
Open Channel Hydraulics, Chow, Ven T., McGraw-Hill Book Co., New York, N.Y. 1959.
[b] 
U.S.D.A. Handbook SCS-TP-61, W.O. Ree.
[c] 
Roughness Characteristics of Natural Channels, U.S.G.S. Water Supply Paper No. 1849, Washington, D.C. 1967.
[2] 
Closed conduits:
[a] 
Seelye's Handbook.
[b] 
Handbook of Hydraulics, King. H.W.
[c] 
USBR Hydraulics Tables.
[d] 
Modern Sewer Design, American Iron and Steel Institute.
(c) 
Natural open channels with vegetative linings shall be designed considering infrequent mowing unless other conditions are demonstrated and justified. Guaranteed maintenance for exceptions must be established, and approved by the City.
(d) 
Cover vegetation for channel linings must be selected according to standards established by the Soil Conservation Service of Canadian County, and shall be approved by the City.
(4) 
When stormwater is conveyed via streets, flumes, swales or open channels, consideration will be given to pedestrian and traffic convenience and safety. Special provisions may be required by the City to avoid sheeting of water across arterial intersections, inundation of crosswalks or sidewalks, inundation of driving lanes, and other safety or nuisance problems. These special provisions may include additional easements or rights-of-way, structures, flumes or pavement width.
C. 
Performance criteria.
(1) 
Detention or retention facilities shall have the following performance criteria:
(a) 
Detention or retention facilities shall be sized by hydraulic stormwater routing through the detention basin and to accommodate or contain any changed drainage conditions due to the proposed development because of increases in the runoff volume or rate.
(b) 
Detention or retention facilities shall have a release rate which does not exceed:
[1] 
The predevelopment of runoff conditions for all return storms; or
[2] 
The "safe" capacity of the downstream drainage channel or system if any increase in runoff volume rate is approved.
(2) 
Open channels, flumes or swales shall have the following performance criteria:
(a) 
All channels, flumes or swales shall be designed to carry the fifty-year return frequency rainfall event.
(b) 
The performance of all channels, flumes or swales during the one-hundred-year return frequency rainfall event must be indicated.
(3) 
Storm sewers and appurtenances shall have the following performance criteria:
(a) 
The combination of storm sewer and its overflow outlet shall have the capacity to convey the ten-year return frequency rainfall event within the drainage easement(s) or right(s)-of-way.
(b) 
The performance of the overflow outlet(s) for the storm sewer system during the one hundred-year return frequency rainfall event shall be indicated under the condition that the storm sewer is plugged or inoperative.
(c) 
The minimum velocity in a storm sewer flowing full shall be three feet per second. Velocities less than three feet per second may be approved if properly designed sediment traps which are accessible for maintenance are provided at the upstream end of the sections where the velocity is to be less than three feet per second.
(4) 
Streets with curb and gutters shall have the following performance criteria:
(a) 
Arterial streets shall maintain two clear, ten-foot lanes of traffic during the twenty-five-year return frequency rainfall event.
(b) 
Drainage on collector streets shall not exceed two inches in depth at the crown of the street during the twenty-five-year return frequency rainfall event.
(c) 
Drainage on residential streets shall not exceed 3 1/2 inches in depth at the crown of the street during the twenty-five-year return frequency rainfall event.
(5) 
Streets without curb and gutters shall have the following performance criteria:
(a) 
Arterial streets shall maintain two clear, ten-foot lanes of traffic during the twenty-five-year return frequency rainfall event.
(b) 
Residential or collector streets and I-40 service roads shall maintain two clear, eight-foot lanes of traffic during the twenty-five-year return frequency rainfall event.
Drainage systems shall be constructed in full accordance with approved designs and specifications, without variation, except as may be authorized by a change order or field change approved by the City.
A. 
The developer, land improver, land owner or legal agent thereof engaging in any land improvement or change covered by this chapter shall be responsible for any and all construction activity as covered by approved designs, plans and data.
B. 
This section shall not be construed to exclude the contractor or his responsible supervisor from providing installations in conformance with the requirements and constraints of this article, whether a part of the design documents, or inadvertently excluded.
C. 
Upon determination and notification by the City that construction or any part thereof is in violation of this chapter, such work shall be immediately discontinued and shall not be restarted until corrected.
D. 
All facilities, structures and installations made under the provisions of this chapter shall be constructed in a workmanlike manner and using methods and procedures that shall assure a quality installation. The construction of any drainage system shall conform to the Oklahoma Department of Transportation Specifications for the Construction of Drainage Systems, as approved by the City. Unless specifically approved otherwise by the City, materials, installations and facilities that are not of the required quality or conformance shall be repaired or replaced as determined by the City.
E. 
The contractor shall provide barricades, guardrails, walkways, shoring, warning signs and flashers, and such other measures as deemed necessary to protect workmen, traffic, pedestrians and any other person near or adjacent to a hazard from injury or damage. Such protection shall be provided upon start of an operation, and shall be fully maintained until there is no longer a hazard and approval has been given for removal of the protection. Signing shall be in accordance with Part VI, Traffic Controls for Street and Highway Construction and Maintenance Operations, of the current Manual On Uniform Traffic Control Devices. The contractor shall, at his own expense, provide and maintain the appropriate traffic control devices.
F. 
The structural integrity of all drainage structures shall be maintained during all phases of construction.
G. 
A construction permit must be obtained from the City according to this section prior to the start of constructing any drainage system or improvement which is owned or to be dedicated to the City, is to be constructed on a City right-of-way or easement, is a required "off-site" improvement of the platting process, or is otherwise required by the City of El Reno. Construction inspections shall be made during and after construction by the City and shall serve as the basis of all approvals or disapprovals.
H. 
The erosion and sedimentation control plan shall be implemented using the "Best Management Practices" as adopted by the U.S. Soil Conservation Service of Canadian County and any subsequent revisions to that document.
I. 
A floodplain permit is required to be obtained prior to any construction activity within the one-hundred-year floodplain as required by the Flood Hazard Zoning Ordinance.[1]
[1]
Editor's Note: See Ch. 361, Zoning.
A. 
Any person, firm or corporation in violation of any provision of this chapter shall be fined not less than $20 nor more than $100 for each offense. A separate offense shall be deemed committed for each day a violation continues.
B. 
During all construction activity, developers, property owners and contractors shall be required to keep streets, gutters, inlets, drainage pipes, swales, ditches, drainage channels and all drainage devices and structures clean and free from debris, sedimentation, soil and any materials. Any failure to meet this requirement shall, upon notice and failure to immediately correct the notified condition, constitute sufficient grounds for stopping all work until correction is completed.
C. 
Developers, landowners or their legal agents, upon receipt of notice by the City that repair or maintenance is required within a channel lying within their property, shall be responsible for effecting such repair or maintenance within the time specified, or the City shall have repair and maintenance performed at the expense of the property owner.