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(a) The Stormwater Runoff Management System shall be composed of:
(1) A primary system;
(2) A secondary 100 year flood system; and
(3) A secondary 10 year flood system.
(b) EDITOR’S NOTE: Former subsections (b), (c) and (d) were deleted by Ordinance 98-12, passed February 23, 1998.
(e) The design and construction of drainage systems shall be such that watercourse
traversing the project and natural water emanating from within the project shall be carried through and off the project without injury to improvements, building sites or buildings existing or to be installed within or adjacent to the project. Drainage water entering the project shall be received and discharged at locations and as nearly as possible in the manner that existed prior to construction of the drainage facilities within the project. The design of drainage facilities within the project shall be such that they shall conform to the ultimate drainage requirements of the land uses within the project watershed.
(1) The primary system shall be constructed and maintained under Chapter 1338, Flood Damage Prevention Standards.
(2) The secondary 100 year flood system shall be designed to allow uphill storm water to flow onto and through the project whenever the ten year flood system is filled to and overflowing its capacity.
It shall be designed to prevent the flooding of the main floor of buildings existing or to be constructed within the project and to further prevent the flooding of the main floor of the building downhill and uphill from the project.
It may utilize open ditches, existing drainageways, drainage swales, open channels, roadways, public rights of way, temporary and permanent detention basins and temporary detention of stormwater runoff in wet bottom basins, dry bottom basins, parking lots, rooftops, percolation storage or other means approved by the City Engineer.
(3) The secondary ten year flood system shall be designed to prevent the possible flooding against building walls of existing and future building construction on the site and to prevent the flooding against building walls of existing and future buildings on adjacent sites. It shall be designed to drain standing storm water from the site within six hours after the termination of any ten year storm. When swales are not steep enough to accomplish this, a drain tile and storm water inlet shall be constructed in the low point of yards and drained through tile to a public storm sewer or ditch. It shall utilize storm sewers, yard slope and drainage swales to contain uphill and on site stormwater within the site which shall be discharged to a public storm sewer or ditch and not allowed to discharge onto adjacent property not part of a public ditch or storm sewers. Yards shall be graded and maintained to drain away from buildings within an eight foot perimeter of buildings to swales or catch basins channeled to prevent storm water damage to adjacent properties. Minimum grade over sod or grounds shall be one-fourth inch per foot. Minimum grade over concrete or pavement shall be one-eighth inch per foot.
Public Right of Way Shoulder Drainage | |||||
Without Curbs | With Curbs | ||||
Shoulder shall slope away from the pavement ** | Shoulder shall slope toward the pavement | ||||
Leavitt Road | Hilly Roads | Nonhilly Roads | Over Ground | Over Sidewalk | |
Minimum Shoulder Slope per ft. | 1/2 inch | * * * 1/2 inch | * * 1/4 inch | 1/4 inch | 3/16 inch |
Maximum Shoulder Slope | 1 foot drop in first 4 ft. | 1 foot drop in first 4 ft. | 1 foot drop in first 4 ft. | no maximum | 1/2 inch per foot |
Minimum Length of Shoulder Slope | 8 feet * * | 8 feet * * | 8 feet * * | entire right of way | width of sidewalk |
Maintain Above Slope Over Drives | Required | Required | Required unless * | entire right of way | width of sidewalk |
The above slopes shall be maintained to a ditch and/or a storm sewer and catch basin, designed to prevent the flooding of the pavement during a ten year flood. The above slopes shall be maintained even when a ditch is filled. | |||||
* Unless a catch basin to a ten year storm sewer is located within twenty feet on either side and within fifty feet of each other on either side of the driveway for shoulder to drain into or a ten year ditch is constructed and maintained along roadway and a culvert is constructed under the driveway. | |||||
* * This slope shall drain to a catch basin or a ditch. | |||||
* * * On hilly roads a slope shall be maintained away from the pavement including the slope over driveways to prevent the street pavement base from washing out due to the velocity of the water running down the roadway and/or water from flooding onto the pavement during any ten year flood. | |||||
(f) When a ditch or storm sewer drains across private property an easement shall be obtained and/or provided.
(g) Driveways may not intersect the pavement higher than the pavement edge. This is to prevent a snow plow from catching the edge of the driveway.
(h) Culverts under driveways shall be installed large enough and steep enough to prevent flooding of the pavement during any ten year flood and shall be constructed in anticipation of any downstream blockage removal and/or replacement. Culvert tile shall be reinforced concrete and be a minimum size of twelve inches unless a storm sewer already exists along the street which is designed for ten year flooding, thereby allowing an eight inch culvert tile.
(i) The top of a culvert pipe shall be located at least five inches below the pavement edge to allow a swale for roadway to drain to in the event the culvert tile are extended across the lot. This may mean that the bottom of the tile is located below the bottom of the ditch or other adjacent tile. Tile shall be installed with a downhill grade of at least four inches in every 100 feet of length.
(j) When replacing an existing driveway culvert the City will “set the pipe” if you purchase and deliver the concrete pipe to the site.
(k) Parking lots for commercial, industrial and multifamily buildings shall not drain onto any City street pavement.
(l) Driveway culverts, roadway swales and ditches shall be maintained by owner and a permit is required to install or regrade. The fee is one dollar ($1.00).
(Ord. 87-80. Passed 11-9-87.)
(a) Easements to the City for the maintenance of storm sewers shall be of width and alignment as stated in the subdivision ordinance and shall be indicated on a plat or on an easement deed and shall be accepted by Council.
(b) EDITOR’S NOTE: Former subsection (b) hereof was deleted by Ordinance 98-12, passed February 23, 1998.
(c) Easements for mutual benefit of owners shall be provided in a form ready for recording and shall include a provision to be maintained by the property owner for the benefit of the uphill property owners with provision that any disputes shall be decided by arbitration in accordance with the rules of the American Arbitration Association.
(Ord. 87-80. Passed 11-9-87.)
YARD DRAINAGE DIAGRAM
Yards shall be graded to drain away from buildings without draining onto adjacent property. A water inlet catch basin shall be constructed at each low point in the rear yard unless swales are constructed deep enough to drain water to the street or to a public ditch. Within an eight foot perimeter of the building the minimum grade over ground shall be one-fourth inch per foot (two inches) and over pavement one-eighth inch per foot (one inch) which grade shall continue to the street or to a catch basin which shall remove any standing water within six hours after termination of a storm.
(a) Residential Garage Floors. Residential garage floors shall drain to the outside under the garage door or to a sanitary sewer drain in the garage floor.
(Ord. 98-12. Passed 2-23-98.)
(b) Surface Drains. Surface drains shall be constructed along the foot of any of the natural ridges to control the flow of spring waters.
(c) Additional Footer Tile. Additional footer tile shall be installed at the low point of any footer located in ground indicated as a severe limitation for homesites as shown on the soil survey map of Lorain County page 48 Table 7 on file at the County Extension Office.
(Ord. 87-80. Passed 11-9-87.)
(d) Roof Gutters. Roof gutters shall be required on all roofs above and within eight feet of any basement or crawl space. Roof water diverters or gutters are required on roofs over walkways and driveways. Downspouts are required on gutters and drained onto pavement without drainage across unpaved yards or walkways and shall not drain into sanitary sewers or footer tile. (See Section 1113.05(e) of the Codified Ordinances.)
(Ord. 97-45. Passed 4-28-97.)
(e) Drainage to Sanitary Sewer Prohibited. None of the following shall be drained to a sanitary sewer: storm water, basement floor drains without a trap primer, driveway trench drain, footer tile, area wells, storm water or sub-surface water sump pumps, air conditioner condenser water to a floor drain or to the sanitary sewer pipe without a trap primer.
(Ord. 98-12. Passed 2-23-98.)
(f) Footing Drain Discharge. Where footing drain discharge is deposited upon the surface of the ground, the place of deposit shall be in that yard area that drains directly to a street, road or ditch, or to the yard area which contains a drainage easement. Discharge of such water upon the surface of the ground shall be carried not less than eight feet from the foundation of walls by means of splash blocks which shall be installed at the time of construction. Footing drain discharge shall not be permitted to a roadway unless an adequate road ditch exists to receive such discharge. Footing drain discharge shall not be directed to, over or through a road curb.
(g) Sump Pumps. Sump pumps shall not discharge onto a street pavement or within an area that could puddle and freeze on the pavement.
(h) Sidewalks and Driveways.
Within Public Right of Way | Outside Public Right of Way | ||
Driveway | Sidewalk (when required) | ||
Residential | Required. Concrete 6 inches thick | Concrete Under drive 6 inches and remainder 4 inches thick | 10 by 20 foot parking pad or garage required |
Width 4 feet Slope 3/16 inch minimum. 1 foot from P.L. and above curb with 1/4 foot slope to curb. | If concrete drive shall be 4 inches thick | ||
There is no minimum requirement from side lot line. | |||
Commercial | Required. Concrete. 6 inches thick Minimum width 26 feet Maximum width 35 feet | Concrete Under drive 6 inches and remainder 4 inches thick. Width 8 feet. | Parking lot may not drain onto public street pavement |
Locate a one inch expansion strip between pavement edge or curb and driveway and on either side of any sidewalk.
Sandstone curbs and sidewalks shall be replaced with concrete under drives.
New curbs shall be eighteen inches wide, six inches deep and height of adjacent curb.
Existing sidewalks may not be removed. Replace if necessary.
Driveway culverts, roadway swales and ditches shall be maintained by owner and a permit is required to install or regrade.
(Ord. 87-80. Passed 11-9-87.)
A permit shall be required from the Building Inspector before construction or replacing a driveway, sidewalk, culvert or to cover a ditch.
(Ord. 03-31. Passed 2-24-03.)
When streets do not have curbs - New and replacement driveways shall be installed per shoulder drainage specifications including any culvert requirements.
Concrete thickness may be reduced one inch if wire mesh is used.
RAINFALL INTENSITY GRAPH
RAINFALL INTENSITY
DURATION CURVE FOR
STORM DRAINAGE FACILITIES
AMHERST, OHIO
Floyd G. Browne and Associates, Ltd.
Consulting Engineers Marion, Ohio
Sidewalk and Driveway | ||
Within Public Right of Way (Concrete Required) | Outside Public Right of Way | |
Residential | 10 by 20 foot concrete parking pad required behind building line unless garage is built | |
If drive is concrete shall be four inches thick and may reduce 1 inch if mesh is used. | ||
4 inch concrete walk (6 foot at driveway) Minimum slope 1/4 inch per foot Thickness may be reduced 1 inch if wire mesh is used. | Drives may be located against the property line. | |
Commercial, Industrial, Multi-Family | Same as residential except increase the width of the sidewalk to 8 feet along major thoroughfares and/or on other streets to same as adjacent walks but not less than 4 feet. | Drives and parking may not drain onto street pavement. |
Driveway width at right of way Minimum 26 feet. Maximum 35 feet | Drives and parking shall be concrete or blacktop. |
When the street pavement does not have a curb, a ditch or swale shall be constructed between the pavement and the sidewalk to City specifications. The sidewalk may be located lower than the pavement when there is no curb along the pavement, provided that the sidewalk drains toward the ditch.
An expansion strip the depth and width of the concrete and at least one-half inch thick shall be placed next to the curb or pavement edge, around hydrants and poles and next to buildings.
Concrete drives, sidewalks and pavement shall have a medium broom finish.
Concrete sidewalks shall have a joint or be sawed at least every eight feet vertical to the curb.
Sandstone curbs and/or sidewalks shall be replaced with concrete whenever new drives are constructed.
Existing sidewalks may not be removed unless they are replaced with new sidewalks.
Residential sidewalks when being replaced may be replaced at the same width as an existing walk. Commercial walks shall be of the new width.
When replacing existing curbs, they shall be constructed to a depth of eighteen inches deep, six inches wide and not less than the height of the adjacent curb.
When replacing an existing driveway culvert, the City shall "set the pipe" if you purchase and deliver the concrete pipe to the site.
A permit shall be required from the Building Inspector before construction or replacing a driveway, sidewalk, culvert or to cover a ditch. The fee shall be one dollar ($1.00).
The concrete in a concrete street will expand, therefore: a concrete drive shall have a free expansion space of at least one inch for each 500 feet of concrete street located ahead of the drive (on a curve in the street or at the end of a dead end street or a cul de sac, etc.) to prevent the expansion of the concrete in the street from pushing the back wall of the garage off the foundation.
(Ord. 87-80. Passed 11-9-87.)
(a) No building permits required under Chapter 1337 for the erection, construction, remodeling or alteration of, addition to, or moving of any building shall be issued unless a lot grading plan which has been certified by a licensed professional engineer or surveyor has first been submitted by the applicant and approved by the City Engineer or Building Inspector.
(b) If the City Engineer has determined that the lot is subject to retention of stormwater, the lot grading plan shall include the retention design and design calculations shall also be submitted. The design calculations for retention design shall be approved by the City Engineer.
(c) The lot grading plan shall be drawn at a scale no less than one inch equals fifty feet, and shall contain, at a minimum, the following information:
(1) Show complete title, location, address, engineer or surveyor certification, list of symbols and abbreviations, and date;
(2) Show lot area in square feet;
(3) Show complete dimensions of new building or addition, sidewalks, drives, means of ingress and egress, and curbs;
(4) Provide north arrow and scale;
(5) Show zoning setbacks, easements and restriction lines;
(6) Show adjacent streets to the centerline of the right-of-way and adjoining properties and building with names and addresses of owners;
(7) Show location and elevation of benchmark used;
(8) Show location, size and elevation data relating to existing storm sewers, catch basins, manholes and ditches;
(9) Show existing elevations of curbs, gutters, ground on lot, ground grade at foundation of adjacent buildings and centerline of pavement; and
(10) Show proposed elevations of basement, first floor, ground grade at foundation, ground on lot, parking lots and drives, sidewalks, catch basins, yard drains and inlets and indicate slopes with drainage arrows where applicable.
(d) The lot grading plan shall be designed using the following criteria:
(1) All standing water shall drain off within twenty-four hours after the end of a storm within a ten-year frequency;
(2) The minimum slope away from the building foundation shall be one-fourth inch per foot on all sides for a minimum of eight feet;
(3) Building foundations shall extend a minimum of eight inches above the ground;
(4) Swales shall be constructed along the side lot lines so that water ponding on the site shall not flood the building on the site or adjacent buildings. Swales along the side lot lines shall be designed for the use of adjacent property owners.
(e) After the lot grading plan has been approved, the building permit has been issued, and construction has begun, but prior to proceeding with construction above the foundation, the lot shall be rough graded and a letter from a licensed professional engineer or surveyor shall be presented to the Building Inspector stating that the building is at or above the proposed plan grade and that the lot as graded shall not cause flooding of adjacent buildings.
(f) Prior to occupancy, the lot shall be fine graded and a letter shall be presented to the Building Inspector from a licensed professional engineer or surveyor that he has checked the grades and that the lot is in compliance with the approved grading plan. If the grading is not completed at the time of occupancy, the owner shall establish an escrow with the City, which the City may use or return at any time after sixty days, to cover the cost of bringing the grading into compliance with the lot grading plan. The Building Inspector shall determine the amount of the escrow.
(Ord. 94-24. Pased 3-14-94.)
(g) A plan review fee in accordance with the schedule of fees approved by Council shall be submitted to the Building Inspector with the site grading plan.
(Ord. 03-32. Passed 2-24-03.)
(h) In any case wherein an application is made for a building permit to remodel, make an addition to or alter an existing building which was built in conformity with the grade established by the proper municipal authority, the Building Inspector is hereby authorized to waive the foregoing requirements of the preparation of a lot grading plan if he shall determine that the remodeling, alteration or addition shall be constructed in conformity with the grade theretofore established.
(i) Anyone wishing to change or alter an established grade which was constructed and approved by the proper municipal authority shall present a lot grading plan conforming to the requirements stated herein. After the changes or alterations have been made, a letter shall be presented to the Building Inspector from a licensed professional engineer or surveyor that he has checked the grades and that the lot is in conformance with the approved lot grading plan.
(Ord. 94-24. Passed 3-14-94.)
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