[R.O. 2008 § 415.020; R.O. 2007 § 415.020; Ord. No. 4974 § 1, 3-30-2006; Ord. No. 6206 § 2, 4-28-2016]
The Legislature of the State of Missouri
has in Section 89.020, RSMo, delegated the responsibility to local
governmental units to adopt regulations designed to promote the public
health, safety and general welfare of its citizenry. Therefore, the
City Council of O'Fallon, Missouri, does ordain as follows.
[R.O. 2008 § 415.030; R.O. 2007 § 415.030; Ord. No. 4974 § 1, 3-30-2006; Ord. No. 6170 § 1, 1-14-2016; Ord. No. 6206 § 3, 4-28-2016; Ord. No. 6737, 12-10-2020]
A. Flood Losses Resulting From Periodic Inundation.
The special flood hazard areas of certain areas in the City of O'Fallon
are subject to periodic inundation which results in loss of life,
property, health and safety hazards, disruption of commerce and governmental
services, extraordinary public expenditures for flood protection and
relief and impairment of the tax base, all which adversely affect
the public health, safety and general welfare.
B. General Causes Of The Flood Losses. These
flood losses are caused by the cumulative effect of urbanization of
watersheds and obstructions in floodplains causing increases in flood
heights and velocities and by the occupancy in flood hazard areas
by uses vulnerable to floods or hazardous to others which are inadequately
elevated, flood proofed or otherwise protected from flood damages.
C. Methods Used To Analyze Flood Hazards.
The Flood Insurance Study (FIS) that is the basis of this Chapter
uses a standard engineering method of analyzing flood hazards which
consist of a series of interrelated steps.
1.
Selection of a base flood that is
based upon engineering calculations which permit a consideration of
such flood factors as its expected frequency of occurrence, the area
inundated and the depth of inundation. The base flood selected for
this Chapter is representative of large floods which are characteristics
of what can be expected to occur on the particular streams subject
to this Chapter. It is in the general order of a flood which could
be expected to have a one percent (1%) chance of occurrence in any
one (1) year as delineated on the Federal Emergency Management Agency's
FIS (Flood Insurance Study) and illustrative materials dated March
9, 2021, as amended, and any future revisions thereto.
2.
Calculations of water surface profiles
are based on a standard hydraulic engineering analysis of the capacity
of the stream channel and overbank areas to convey the regulatory
flood.
3.
Computation of a floodway required
to convey this flood without increasing flood heights more than one
(1) foot at any point.
4.
Delineation of floodway encroachment
lines within which no development is permitted that would cause any
increase in flood height.
5.
Delineation of flood fringe, i.e.,
that area outside the floodway encroachment lines, but still subject
to inundation by the base flood.
[R.O. 2008 § 415.040; R.O. 2007 § 415.040; Ord. No. 4974 § 1, 3-30-2006; Ord. No. 6206 § 4, 4-28-2016]
A. It is the purpose of this Chapter to promote the public health, safety and general welfare and to minimize public and private losses described in Article
II, Section
415.030(A); to establish or maintain the community's eligibility for participation in the National Flood Insurance Program (NFIP) as defined in 44 Code of Federal Regulations (CFR) 59.22(a)(3); and to meet the requirements of 44 CFR 60.3(d) by applying the provisions of this Chapter to:
1.
Restrict or prohibit uses that are
dangerous to health, safety, or property in times of flooding or cause
undue increases in flood heights or velocities;
2.
Requires uses vulnerable to floods,
including public facilities that serve such uses, be provided with
flood protection at the time of initial construction; and
3.
Protect individuals from buying lands
that are unsuited for the intended development purposes due to the
flood hazard.
[R.O. 2008 § 415.050; R.O. 2007 § 415.050; Ord. No. 4974 § 1, 3-30-2006]
A. In order to accomplish its purpose, this
Chapter includes methods and provisions for:
1.
Restricting or prohibiting uses which
are dangerous to health, safety and property due to water or erosion
or to flood heights or velocities.
2.
Requiring that uses vulnerable to
floods, including facilities which serve such uses, be protected against
flood damage at the time of initial construction.
3.
Controlling the alteration of natural
floodplains, stream channels and natural protective barriers which
are involved in the accommodation of floodwaters.
4.
Controlling filling, grading, dredging
and other development which may increase erosion or flood damage.
5.
Preventing or regulating the construction
of flood barriers which will unnaturally divert floodway waters or
which may increase flood hazards in other areas.