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(a) An adequate storm drainage system shall be provided for each subdivision, lot, and development. The design of storm sewer shall be prepared using the rational method and shall be based on a minimum five year storm frequency. Rainfall intensity, runoff coefficients, and time of concentration used in computing flows and structure sizes shall be in accordance with the tables, charts, and the data established by the City Engineer for such calculations. All areas which contribute storm water to the proposed storm drainage system must be considered on the determination of the sizes of structures and channels.
(b) The drainage requirements of this section shall apply to all new subdivisions and new construction or developments on any lot, whether development of undeveloped land or redevelopment of previously developed land, but shall not apply to residentially zoned subdivisions or lots including five acres or less and no permits or plans to connect to the storm sewers of the City shall be approved unless and until drainage plans are presented to the Service Director in compliance with the provisions of this section.
(1) Drainage plans shall be accompanied by the design computations and a topographic map showing existing and proposed contours and indicating design increments. A hydraulic gradient check shall be made for a 10-year storm and may also be required by the City Engineer for the 25-, 50- and 100-year storms where deemed appropriate.
(2) Drainage structure sizes (bridges and culverts) shall be determined by using the current Ohio Department of Transportation design method and shall be based on a 10-year frequency storm for watersheds up to 100 acres, a 25-year frequency storm for watersheds from 100 to 250 acres and a 50-year frequency storm for watersheds greater than 250 acres.
(3) Bridges shall be designed in accordance with the current standards of the Ohio Department of Transportation.
(4) Detention ponds or basins shall be provided where necessary to control the volume and velocity of storm water leaving the site. Detention ponds and basins shall be designed in accordance with master watershed drainage plans. Where such plans do not exist, storm water retention/detention facilities shall be designed with the following design criteria. The purpose of this is to:
A. Permit commercial, industrial, and residential development without increasing the flooding of other lands.
B. Limit and/or reduce the adverse impact on receiving streams, storm sewers, and other drainage facilities caused by accelerated runoff due to development.
C. Provide a basis for design of storm drainage systems on lands above or below undeveloped areas which will preserve the rights and options of both contributing and receiving property owners and assure the long-term adequacy of storm drainage systems.
(c) The design criteria will require that peak discharge flow rates be controlled in proportion to increased runoff volume. If development does not increase runoff volume, peak flows will not be required to be controlled. However, as development increases the runoff volume due to increased area of impervious surfaces, the criteria will be more stringent.
(d) The design criteria will apply where necessary and as required by the City Engineer or in accordance with a master watershed drainage plan for:
(1) All residential developments containing five acres or more;
(2) All commercial developments or sites regardless of size; and
(3) All industrial developments or sites regardless of size.
(e) Increased storm water runoff peak flow rates and volumes shall be controlled such that:
(1) The peak flow rate or runoff generated from the critical storm and all more frequent occurring storms on the development area does not exceed the peak flow rate or runoff from a one-year frequency, twenty-four hour storm occurring on the same area under pre-development conditions.
(2) Storms of less frequent occurrence (longer return periods) than the critical storm up to the 100-year storm have peak flow runoff rates not greater than the peak flow runoff rates from the equivalent size storms under pre-development conditions. Consideration of the 1-, 2-, 5-, 10-, 25-, 50-, and 100-year storms will be considered adequate in designing and developing drainage facilities to meet this standard.
(f) The critical storm for a specific development area shall be determined as follows:
(1) Determine the total volume of storm water runoff from a one-year frequency, twenty-four hour storm occurring on the development area before and after development. The total runoff volumes shall be determined by the “Peak Discharge Method” of calculating peak rate and total volume of runoff as described in the U.S. Soil Conservation Service's “Urban Hydrology for Small Watersheds”, Technical Release No. 55 and its latest editions, including all applicable supplements. This hydrologic method shall also be utilized for all detention basin inflow design calculations.
(2) Based on the volumes calculated in paragraph (1) above, determine the percent increase in volume of runoff due to the development and using this percentage, select the twenty-four hour critical storm from the following table:
If the percentage of increase in volume of runoff is | ||
equal to and/or greater than | less than | The critical storm for discharge limitation will be |
If the percentage of increase in volume of runoff is | ||
equal to and/or greater than | less than | The critical storm for discharge limitation will be |
-- | 10 | 1 year |
10 | 20 | 2 year |
20 | 50 | 5 year |
50 | 100 | 10 year |
100 | 250 | 25 year |
250 | 500 | 50 year |
500 | -- | 100 year |
(g) Complete flood routing calculations will be required to confirm that the proposed detention basin facility meets the above criteria. As a minimum, the flood routing calculations shall include the following information:
(1) Overall drainage plan of the site showing existing and proposed grading, existing and proposed runoff flow paths and drainage facilities, contributing areas draining to the drainage system and predominant soil types.
(2) Plan view, typical cross-sections and pertinent details of the proposed detention basin and its primary and emergency outlet control structure(s).
(3) Detention basin reservoir capacity versus reservoir water surface elevation calculations.
(4) Outlet control structure discharge versus reservoir water surface elevation hydraulic calculations, including the assumptions or calculations made to determine the existing drainage system hydraulic gradient or water surface elevation at the outlet control structure discharge point.
(5) Inflow-outflow hydrographs, both in tabular and graphical form for the one-year storm, the critical storm and all storms exceeding the critical storm. The required inflow hydrographs shall include both pre-development and post-development conditions.
(6) The assumptions and/or calculations utilized in determining the inflow hydrographs in accordance with the accepted hydrologic method.
(7) Hydraulic gradient calculations for the proposed storm drainage system emptying into the detention basin based on the critical storm design year and other storm design year frequencies as may be required by the City Engineer.
(8) Downspouts shall be connected to existing storm sewers.
(9) Storm sewers shall be constructed of materials approved for use by the City Engineer based on performance standards as established by ASTM or other testing agencies.
(10) Manholes shall be provided at all changes in alignment and grade of storm sewers and at such other locations as necessary to maintain an interval of at least 300 feet and not more than 350 feet between manholes or storm sewers.
(11) Storm inlet or catch basin grates shall be of a type designed to permit safe crossing by bicycles as approved by the City Engineer.
(12) Easements governing storm drainage facility improvements in the City shall be determined as follows.
(h) All storm drainage structures shall be placed on appropriate drainage easements with area-wide facilities placed on City-owned easements and local service facilities placed on homeowner, owner, or homeowner's association-owned easements.
(i) An area-wide facility is one which has one or more of the following characteristics or criteria:
(1) Dedicated public street drainage is dependent upon the storm sewer or other drainage facility;
(2) Storm sewer or ditch receives upstream flows from a defined drainage channel.
(3) Storm sewer or ditch serves more than twelve sublots and contains a drainage facility which is more elaborate than a rear yard swale.
(4) Any lake, pond or basin shall be designed to detain or retain substantial storm water beyond development in which facility is contained and shall be equipped with aerator facilities where odor problems are likely to occur, which capacity and facilities shall be approved the City Engineer.
(5) An addition to or an improvement of an existing area-wide facility.
(j) Local service facilities shall include all other facilities not meeting the above area-wide drainage facility criteria.
(k) Except for good cause shown, and to the satisfaction of the City, City financial assistance shall only be considered for area-wide drainage facilities. Administrative advice may be provided on local service facilities.
(l) Each sublot created by subdivision of property shall have functional access to a rear yard drain connected to the subdivision drainage system. This requirement can be waived when a natural waterway transverses the rear yard and when the rear property is at a slope greater than two percent toward the waterway.
(m) The Service Director may waive any requirement of this section to install a retention pond where the Service Director and City Engineer find that extraordinary and unnecessary hardship may result from strict compliance with this regulation as a result of topographic or other physical conditions, provided such waiver does not violate the intent of the regulation and will not be detrimental to the public interest. Extra capacity may be required in specific instances when determined necessary due to limited outfall capacity in the opinion of the Service Director and City Engineer.
(Ord. 10-2001. Passed 1-16-01.)
The City Council hereby finds and declares that any land site substantially cleared of trees and vegetation, whether used or to be used for construction, top soil screening, sand and gravel, or other operations involving bulk depositing, storage, stripping or removing of soil, top soil, loam, sand, gravel, or other fill type substances on or from such land, unless regulated, is susceptible to erosion, standing and stagnant water, dust, and storm water runoff including sediment, silt, grit, dirt, and other pollutants that flows from such site and enters into private and City ditches, storm sewers, catch basins, retention basins, and other storm collection facilities and into streams and lakes which conditions clog, fill and reduce the effectiveness, capacity, and use of the City's drainage system and natural streams and constitute a nuisance that must be abated. For purposes of this chapter, “site substantially cleared of trees and vegetation” shall mean and include any property site including at least one acre of land so cleared.
(Ord. 11-2001. Passed 1-16-01.)
(a) No person, firm, corporation, owner or lessee of any lot or land shall change or alter or cause to permit a change or alteration in the existing grade or topography of said land, whether said change or alteration results from stripping or removing soil or substance from said land or depositing soil or some other fill type substance on said land, including but not limited to, top soil, loam, sand or gravel, unless said change or alteration is in conformance with a permit to do so issued pursuant to the provisions of this chapter.
(b) No person, firm, corporation, owner or lessee of any lot or land shall cause or permit such lot or land to be substantially cleared of trees and/or vegetation, maintain or permit such lot or land to remain substantially cleared of trees and/or vegetation, or engage in or continue to engage in any activity or operation on such lot or land substantially cleared of trees and/or vegetation including activities such as construction, top soil screening, sand and gravel, or other business operations involving bulk depositing, storage and/or stripping or removing of top soil, soil, sand, gravel, or other fill substances on or from said land without first applying for and securing a permit pursuant to the provisions of this chapter including the provisions of Sections 565.03 and 565.04 of the Euclid Code of Ordinances on or before substantially clearing such land or commencement of any operation or activity thereon and annually so long as such land remains substantially cleared of trees and vegetation or any operation or activity continues on such cleared site.
(c) Any such person, firm, corporation, owner, or lessee, who shall continue to maintain or permit such condition to continue or engage in such operations or activities shall apply for a new permit pursuant to Sections 921.20 and 921.21 of the Euclid Code of Ordinances annually on or before the first day of March of each year so long as such site remains substantially cleared of trees and vegetation or any operation or activity continues on such cleared site. For purposes of this section, “site substantially cleared of trees and/or vegetation” shall mean and include any property including at least one acre of land so cleared as determined by the Service Director and/or City Engineer.
(d) Provided further, however, that no words or language of this section or provision shall be construed to permit any use or activity otherwise prohibited by the ordinances of the City.
(e) Any person, firm, corporation, owner, or lessee, who shall own or control all or any part of a contiguous acre of land so cleared who fails to secure any permit or renewal thereof required by this section shall be guilty of a misdemeanor of the first degree and subject to the penalty provided in Section 921.99. Each day upon which such a violation continues shall constitute a separate offense.
(Ord. 11-2001. Passed 1-16-01.)
Any person, firm or corporation or any owner or lessee of a lot or land desiring a permit to change or alter the grade or topography or clear such lot or land of trees and vegetation as referred to in Section 921.19 or seeking plan approval pursuant to an application for a building permit shall file with the Service Director and/or City Engineer a written application therefor. A fifty dollar ($50.00) fee shall be submitted with each such application. The Service Director and/or City Engineer may require the application to include some or all of the following information depending upon the nature and scope of the proposed operation:
(a) The full name and address of the applicant, and if the applicant is a partnership, the full name and address of each of the partners, and if the applicant is a corporation, the name and address of its principal officers.
(b) Plan or description of the land from which the soil or substance is to be removed or on which the soil or substance is to be deposited, specifying the type of soil or substance to be removed or deposited and the quantity in cubic yards of soil or substance to be removed or deposited.
(c) If persons other than the owner are interested in securing a permit, the owner shall join in, sign and be made a party to the application for such permit and shall agree to be bound by any condition imposed or made a part of said permit.
(d) The method by which the soil or substance is to be removed from or deposited on said land, and the equipment that will be used, specifying further the equipment that will be left upon the land between the commencement and completion of the operation.
(e) A site plan, developed from a field survey, showing the existing and proposed grade or topography at one or two foot contour intervals on the lot or land involved and the land within 300 feet of the land involved including property lines, easements, street right-of-ways, watercourses, bodies of water and existing structures. Said site plan shall be prepared at a scale of no less than fifty feet per inch by a licensed engineer or surveyor.
(f) A sufficient number of dated photographs of the land showing the existing condition of the land depicting trees, landscape features and existing structures.
(g) Engineering details, plans or methods concerning the prevention of erosion, dust control, alteration or filling of drainage ditches, swales or culverts, interfering with or buying sewer or utility lines and the changes in the surface water runoff and the control thereof including an erosion and sedimentation control plan in compliance with Section 921.25.
(h) The plans or methods by which the land is to be restored after the removal or deposit of the soil or substance including the reseeding and/or replanting of the land.
(i) Chemical analysis of the soil or substance to be removed and/or embanked.
(j) The method of drainage sufficient to provide positive drainage of the entire site to be used during and after the operation is completed.
(k) Certification by a licensed engineer indicating the type of construction which could not be located upon the land as a result of the removal or deposit of the soil or substance.
(l) A plan or description of the proposed use of the land after removal or deposit of soil or substance.
(m) Written acknowledgment that the applicant will bear the expense of the necessary municipal inspections during the operation under the permit. Said expense shall be at hourly rates as established by the Service Director or City Engineer.
(n) A work schedule setting forth the proposed time limits within which the operation will be commenced and completed showing the days and hours of operation, proposed haul roads if over the road vehicles are employed, methods of traffic control, methods of maintenance to insure that public right-of-ways are kept undisturbed, clean and safe along or in the vicinity of the proposed haul roads from or to the land involved.
(o) Such other or further information as the Service Director and/or City Engineer may deem necessary.
(Ord. 11-2001. Passed 1-16-01.)
The applicant for a permit pursuant to Section 921.20 shall furnish a performance surety in the minimum amount of five hundred dollars ($500.00) for each acre or fraction thereof included in said permit. The exact amount of said bond shall be as established by the Service Director and/or City Engineer and is intended to cover any and all expenses for the restoration of said permitted land disturbance if not completed by the applicant.
(Ord. 11-2001. Passed 1-16-01.)
(a) The Service Director shall review the applications made pursuant to Section 921.20 and 921.21 and, if he or she determines that the proposed grade changes will not adversely affect the public welfare, health, safety and convenience, he or she shall: grant the permit if it does not require any further permits under the codified ordinances of the City and shall grant approval of grading and/or erosion and sedimentation elimination plans associated with an application for a building permit pursuant to the Building Code of the Codified Ordinances of the City. In granting said permit or approval the Service Director and/or City Engineer may impose reasonable conditions relating to:
(1) The method of removing or depositing the soil or substance.
(2) The term of the permit.
(3) The type and/or quantity of the soil or substance to be removed or deposited.
(4) The effect on adjoining property by virtue of odors, noise, dust, drainage or erosion.
(5) A surety to provide for the repair of the probable effect upon a public right-of-way particularly damage to the road surface.
(6) Maintenance and restoration of land during and after construction in compliance with Section 921.25.
(7) Such other matters as may reasonably be required to protect the public health, safety, welfare and convenience. Any conditions so imposed by the Service Director and/or City Engineer shall be made a part of the permit and shall bind the applicant, and all successors or assignees.
(8) A reasonable deposit to be drawn upon for the cost of municipal inspections. Said deposit shall not exceed the cost of five hours' inspection per week for the term of the permit.
(1) Made pursuant to a previously issued building permit, when the change or alteration is set forth in the plans submitted with the application for said permit approved by the Service Director.
(2) Made pursuant to a previously approved subdivision plat when the change or alteration is shown in the plans filed and approved by the Service Director in conjunction with said plat.
(3) Made upon a single family residential lot on which there exists a dwelling house and when:
A. The change in grade or topography is solely for the purpose of landscaping, and
B. The change in grade or topography does not change, increase, alter or restrict the existing surface water drainage from or to adjacent lands.
(c) Uses not Applicable or Permitted. The provisions of Sections 921.20 and 921.21 do not apply to or authorize permits for the removal or deposit of gas, petroleum or other hydrocarbons from, upon or under the land surface nor does it apply to or permit what is generally known as a mining operation, except stone quarries. The provisions of Sections 921.20 and 921.21 shall in all cases apply and override the provisions of Chapter 567, except as to parcels including less than one acre of land.
(Ord. 11-2001. Passed 1-16-01.)
(a) Measures shall be taken to minimize erosion and its impacts during subdivision and all other construction activity. Detailed erosion control plans setting forth the techniques to be used both temporarily (during construction) and permanently, and a schedule for implementing or installing same shall be submitted with the final plat or plans. All erosion control devices shall be in place at the start of construction and other measures implemented according to the approved time schedule.
(b) Erosion control plans shall be based upon controlling erosion on-site, with the object of eliminating or minimizing erosion or sedimentation impacts off-site. Techniques, devices or measures used shall be as approved by the Service Director and City Engineer based on site conditions and current City policies and standards.
(Ord. 11-2001. Passed 1-16-01.)
(a) Steep Slope Restrictions. Buffer width determination: No dwelling or accessory building shall be constructed within ten feet of the top of a natural or man-made slope having a ratio between 3H:1V and 4H:-1V or within twenty feet of the top of a natural or man-made slope steeper than 3H:1V unless the City determines that appropriate protection measures are taken to ensure slope stability and avoid erosion. If the soil's natural angle of repose would necessitate a flatter slope than 4H:-1V, no dwelling or accessory building shall be constructed within ten feet of the stable top of the slope so determined. Sufficient soils and site information shall be provided to the City to verify the required buffer width.
(b) Stream Valley Preservation. Conservation protection zone: Areas within 25 feet of the normal stream’s edge with a watershed of 100 acres or more shall be designated “conservation protection zones” (CPZ) and shall be designated on the plat. Due to naturally occurring stream dynamics and potential change of stream boundaries, the CPZ shall be defined on the plat with consideration of the on-site conditions and the required 251 minimum offset from each edge. No encroachment within this section shall be permitted unless otherwise approved by the City Planning and Zoning Commission.
(Ord. 11-2001. Passed 1-16-01.)
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