This Part 7 shall be known as and cited as "The
City of Evanston, Wyoming, Storm Water Runoff Control Ordinance."
This Part 7 is adopted for the purpose of providing a standardized, safe and orderly manner of collecting, transporting, and disposing of storm water runoff. The primary goal of this Part 7 will, therefore, be to protect and safeguard human health, life, and property, and to provide uniform storm water drainage standards in the development and subdivision of all lands. The territorial jurisdiction of the regulations found in this Part 7 shall include all of the incorporated lands located within the City and, pursuant to Wyoming Statutes, 1977, annotated Republished Edition, section 15-3-202, such other territory peripheral to the City which is located within one-half mile of the corporate limits of the City.
As used in this Part 7, the following terms
shall have the meanings indicated:
Those roads defined as urban collector roads on the approved
state urban systems transportation map.
City council of Evanston, Wyoming.
The appointed registered engineer who is responsible for
the administration of urban runoff matters and this Part 7.
The setting apart of land or interests in land for use by
the public. Land becomes dedicated only when accepted by the City
as a public dedication, either by the passage of an ordinance or by
entry of a resolution of approval in the official minutes book of
the official meetings of the City.
Guidelines upon which planning and engineering decisions
and judgments are based.
A precipitation event that, statistically, has a specified
probability of occurring in any given year (expressed either in years
or as a percentage).
An individual, firm, or group who undertakes the subdividing
of a lot, tract, or parcel of land for the purpose of transfer of
ownership or building development, and including dedication of street
or changes in street or lot lines.
Interception, collection, and removal of excess storm water
from an area into another area or into a receiving water body.
A grant by a property owner to specific persons or to the
public to use land for specific purposes.
Preventing the entry of stormwater into an area from another
area, or from a stream or other water body.
The division of a lot, tract, or parcel of land into more
than two parts for the purpose of transfer to ownership or development,
and also surveys for clarification of property ownership and/or street
rights-of-way.
A "systems" approach to the planning of facilities, programs,
and management organizations for comprehensive control and use of
storm water within a defined geographical area.
A flood stage that statistically has a one percent probability
of occurring in any given year.
A map of all or part of a subdivision providing substantial
conformance to an approved preliminary plat, prepared in accordance
with Wyoming Code as amended or subsequently codified.
A preliminary plan and other documentation of a proposed
subdivision, planned unit development, or dedication containing the
elements and requirements set forth in the subdivision ordinance.
A written agreement between seller and purchaser stating
restrictions or conditions.
The rate at which rainfall falls to the ground in inches
per hour. The value of this rainfall will vary depending on the duration
of the storm event.
Streams, lakes, bays, etc., into which storm waters are discharged.
Shall means mandatory.
Wherever used in this Part 7, the special building permits
shall refer to those building permits required by the City, in conjunction
with construction of multi-family dwellings, commercial and industrial
facilities, and all public facilities. Building permits required for
single-family dwelling units or duplex units shall not be considered
a special building permit in this ordinance.
Detailed engineering drawings and/or specifications promulgated
by public or private organizations that leave little choice to design
engineers and technicians (e.g., manhole, catch basin, and inlet standards).
Usually enclosed conduits that transport storm water runoff
toward points of discharge (sometimes called storm drains).
Temporary storage of runoff on, below, or above the surface
of the earth for the purpose of attenuating runoff.
A right-of-way which provides vehicular and pedestrian access
to adjacent properties, the dedication and maintenance of which the
City has accepted by official action. It shall include the following
terms: street, drive, court, circle, private street, road, avenue,
boulevard, lane, place, and other such terms.
The time period necessary for surface runoff to reach the
outlet of a sub-basin from the hydraulically most remote point in
the tributary drainage area.
The sum of the time intervals for overland flow, sewer or
gutter flow, and pipe and channel flow from the hydraulically most
remote point in the tributary to the discharge point of interest.
Facilities for service to and use by the public.
Before any special building permit is issued or approved by the City, a drainage plan shall be submitted and approved by the City in accordance with the requirements of section 7-98 through 7-101 of this Part 7. Also, before any subdivision of land or development occurs within the City or its impact zone, a preliminary and final drainage plan shall be submitted and approved by the City and its City engineer. The procedures for these submissions and approval of these drainage plans shall follow the procedure outline in sections 7-98 through 7-101 of this Part 7.
