082-78 Ordinance
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RECORD OF ORDINANCES
I National Graphics Corp" Cols.. O. ~1>u Form No, 2806.A
r Ordinance NO.nmu'"_~_?nu! 8 passedm_m__N.o)/_2_D__W8-_m_m_nn__19 __m__
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TO AMEND ORDINANCE 27-74 SECTIONS 102 f1
310 (PART OF THE SUBDIVISION REGULATION),
fi RELATIVE TO STORM DRAINAGE.
U BE IT ORDAINED by ~he Council of the Vi 11age of DubJin, State of
Ohio ~ of the elected members concurring:
SECTION I; That Ordinances 27-74 be amended by adding the fol low-
Ing in Sections 102 and 310 of the Subdivision Regulations.
DEFINITIONS:
"Channel" means a natural or artificial watercourse, which
continuously or periodically contains moving water or which
forms a connecting link between two bodies of water. It has
a definite bed and banks whie~ confine the water. "Channel
Flow" means the water flowing within the limits of the de-
fined Channel.
. "DevEd operf' , means any person who acts in his own behalf or
as the agent or an owner of-property and engages in alter-
ation of land or veQet~tion, in preparation for, or under-
taking construction activity.
0 "Development" means any action, in preparation for, or under-
taking, construction activity which results in an alteration
,of' of either I and or vegetat i on.
"Ditch" means an open channel either dug or natural for the
purpose of drainage or irrigation with intermittent flow.
(See stream, drainageway, and grassed waterway.)
"Drainageway" means a route or course along which water moves
or may move to dra.in an area.
"Emergency Flow Way" means the flow routes and drainageways
necessary to convey the tOO-year storm.
"Florid" means the temporary inundation of any land not norm-
ally covered by water due to heavy rainfall or runoff or due
to 8 temporary rise in the level _9f rive!,s, streams, water-
courses, or lakes.
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I . "Average Annual Flood" means a flood equal tot he
mean of discharges of all the maximum annual floods
during the period of record.
I 2. "Re~ional Flood" means the name applied to the' 100-
~ year flood in flood plain informatio~ reports. The
100-year flood has a one percent probabi lity of be-
ing equalled or exceeded in a period of 100 years.
3. "Maximum Probable Flood" means the largest flood dis-
charge believed possible considering the meteorologic
conditions'and snow cover on the watershed.
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Ordil\4nce ~O. PlW'eQ - 19- I
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(Cont.) I
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2. "Major Drainage System" means that storm drainage system which
carries the runoff from a storm having a frequency of occurence I
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\ of once in 100 years. The major system will function whether I
' or not improvements are situated wisely in respect to it. The
major system is also termed the "Emergency Flow vlay" . I
The major system usually includes many features such as streets,
ravines, and major drainage channels. Storm sewer systems may
reduce the flow in many parts of the major system by storing and
transporting water under ground.
"Stormwater Design Manual" means the techriical design manual prepared by
the Stormwater Management Advisory Committee of the Mid-Ohio Regional [J
Planning Commission as adopted by the Village. I
"Stream" means a course of running water usually flowing in a particular [I
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direction in a definite channel and discharging into some other stream I
or body of water. i
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"Watercourse" means a channel in vlhich a flow of water occurs either con-
tinuously or intermittently in a definite direction. The term applies to 1
either natural or artificially constructed channels. I
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a Section 310 Storm Drainage (this replaces existing Section 310) "
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10.01 STOR}~MTER DESIGN MANUAL: II
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The Stormwater Design Manual is hereby adopted by the Village and the
policies, standards, specifications, and provisions contained therein I
shall apply to the development of all subdivisions in the Village.
lD.02 HYDROLOGIC AND HYDRAULIC STUDIES: "
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A hydrologic and hydraulic study of each subdivision shall be s,ubmitted
prior to final plat approval and as part of the construction drawings. )
These studies will be used to establish the adequacy of the drainage sys- I
tem of the development site. As part of these studies, the adequacy of "
the storm drainage facilities necessary to carry the runoff from the
initial storm design shall be shown. Also the flow routes and drainage-
ways necessary to convey the 100-year storm (the emergency flow way)
through.the development shall be shown. Necessary' easements shall be I
shown.
,These studies will also be used to establish the adequacy of the drainage I
system of the proposed development to receive and convey the initial and
major storms from dominant (upstream) property.
(1 These studies will also be used to establish the adequacy of the drainage
I ~ system of the proposed development so as not to create or worsen drainage
V problems do~~stream. As part of these studies, storage facilities, when
used, will be located and identified by type. I
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Ordm,ance .No. Passed l~ I
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(Cont. )
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, "Floodway" means the channel of the watercourse and those portions of the
U , adjoining flood plain which are used to convey the regional flood.
"Grassed rlaterway" means a broad and shallow natural course .or construct I
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ed channel covered.with erosion resistant grasses or similar herbacious I
cover and used to conduct surface water. 'I
"Hydrologic and Hydraulic Study" means engineering study to determine I
rates, volumes, and distribution of storm runoff, and its collection,
storage, and conveyance.
. "Runoff" means the portion of rainfall, melted snow or irrigation water I
that flows across the ground surface and eventually is returned to
streams . "
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"Accelerated Runoff" means increased runoff due to 'ess per- I
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meab,le surface area primarily caused hI urbanization. ,
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2. "Peak Rate of Runoff" means the maximum rate of runoff for any I
storm. I
3. "Runoff Volume" means the total quantity or volume of runoff I
during a specified time period. It may be expressed in acre- I
n feet, in inches-depth of the drainage area, or in other units I
of volume. t
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U "Storage" means' the control, retention, or detention of runoff.
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1. "Detention Storage" means storm runoff collected and stored for I
a short period of time and then released at a controlled rate. I
(Dry 'pond) . ,
2. "Retention Storage" means storm runoff collected and stored for
'a short period of time and which is released at a controlled !
ra te leaving in the facility a minimum pool of water. This
facility is often associated with water-related recreational
or aesthetic uses. (Wet pond).
"Storage Facility" means any facility used to store, retain or detain r,
storm runoff, which shall include but not be limited to retention and
detention storage facilities, rooftop or parking lot ponds, basins, de-
pressions and pools. I
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"Storm Frequency" means the average period of time in which a storm of !
- a given duration and intensity can be expected to be equaled or exceeded.
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"Storm Drainage System" means the surface and subsurface system for the
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removal of water from the land, including hoth the natural elements of
n streams, gullies, ravines, marshes, swales and ponds, whether of an inter~
mittent or continuous nature, and man-made elements which include conduit
. ~ and appertenant features, culverts, ditches, channels, storage facilities
V streets, and the storm sewer system.
1. "Initial Drainage System" meqns that part of the storm drainage
system which is used regularly for collecting, transporting, and
disposing of storm runoff, snowooelt, and miscellaneous minor I
flows. The capacity of the initial drainage system should be
equal to the maximum rate of runoff to be expected from a design
storm which may have a frequency of occurrence of once in five,
ye ars . The initial system is also termed the "convenience sys-
tem", "minor system", or the "storm sewer system", and may in-
clude features ranging from curbs and gutters to storm sewer
pipes and open drainage ways. I
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Ordil\4nce 190. Passed - 1S1-
( Cont . )
0 310.03 STORMWATER RUNOFF LIMITATIONS:
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A. \ If the hydrologic and hydraulic studies reveal that the proposed de-
ve1npment or subdivision would not increase the total volume of runoff, .
the peak rate of runoff after development shall not be greater than the I
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peak rate of runoff before deveJ opment for all return periods of stor f
up to one hundred (100) years. f
B. If the hydrologic and hydraulic studies reveal that the total volume
of runoff is increased, the peak rate of runoff after development from
the critical storm shall not exceed the predeve10pment peak rate of '1
runoff from a one-year frequency storm. Stormwater Design Manual and I
the ,peak rate of runoff for each storm of greater or lesser frequency
shall be determined in accordance therewith. Provided, however, that
.the peak rate of runoff after develorment may not 'exceed thefl~ rate ~
of runoff before development.
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310.04 SUBDIVISION DRAINAGE SYSTEM:
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A. Storm drainage facilities for the subdivision or development shall be
designed to .accomodate runoff from the five (S) year storm frequency. !I
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Site design and grading plans shall provide emergency drainageways, in
order to avoid both damage to structure and endangering public safety, t
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which emergency drainageways shall be designed to accomodate runoff
IJ from storms exceeding the five (S) year storm frequency but not exceed- I
ing the one hundred (100)' year storm frequency.
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B. The initial drainage system shall be located within street rights-of- l
way whenever practicable. If the collector facilities cannot be locat-
ed in street rights-of-way, then they shall be located adjacent to side I
or rear lot lines where easements shall be provided to~ and along, the
,facilities.
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C. All storm water flow from the proposed subdivision including flows from
upstream areas passing through, and further including increased flows
attributable to changes in time of concentration or changes in the form-
er runoff factor (Impreviousness), shall be conveyed to the p roper out-
let for the entire tributary area via a natural channel or an artificia
channel either or both of which shall be improved so as to be of adequa e
capacity determined in accordance w~th the Stormwater Design Manual. I
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310.0S EASEMENTS AND ACCESS: ~
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Access to flood control or storm drainage facilities for emergency, in-
spection, maintenance and improvement purposes, shall be provided as
follows:
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A. Access to flood control or storm drainage ditches, channels, and stor- ~
, age facilities, shall be by means of easements. Such easements shall i
V be not less than fifteen (lS) feet in width, exclusive of the width of I
the ditch, channel, or other facility it is to serve, and an, easement
of this type shall be provided on one (1) side of a flood control or
storm dr~nage ditch, channel, or similar type facility.
B. Access along flood control or storm drainage ditches and channels, shal I
be by means of easements. Such easements shall be not less than fiftee I
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(lS) feet in width, exclusive of the width of the ditch, channel, or I
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other facility it is to serve, and an easement of this type shall be I
provided on both sides of a flood control or storm drainage ditch, !
channel, or similar facility. I
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Ordm,o.nce filo. PaIred NOV 2 0 191R .19-
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(Cont. ) !
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U C. Access along the initial drainage system shall be by means of easments r.
Such easements shall be not less than fifteen (lS) feet in width, with I,
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\ a minimum of five (S) feet in width on each side of the center line. I
D. Access around storage facilities shall be by a ten (10) foot easement
in the case of detention (dry) basins, and twenty-five (2S) foot
easement in the case of retention (wet) basins, measured from the line
of the design high water level and shall include the storage facility
itself .
E. Easements for the emergency flow ways shall be a minimum of fifteen
(IS) feet in width.
F. Flood control or storm drainage easements containing undergroud fac-
~ ~ ilities shall have a minimum width of ten (10) feet.
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SECTION ~. That this Ordinance shall take effect and be in force from and
after the earliest period allowed by law.
Passed this ~O~"" day of NOCl6mPl~ , 1978.
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ATTEST:
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Clerk - Treasurer
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