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Purposes & general provisions
The Legislature of the State of Missouri has in Section 89.020, RSMo., delegated the responsibility to local governmental units to adopt floodplain management regulations designed to protect the health, safety, and general welfare. Therefore, the Board of Aldermen of the City of Crestwood, Missouri, ordains as follows:

Findings of fact.
1.  Flood losses resulting from periodic inundation. The special flood hazard areas of the City of Crestwood, Missouri, are subject to inundation which results in loss of life and 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 of which adversely affect the public health, safety and general welfare.
2.  General causes of the flood losses. These flood losses are caused by:
a.  The cumulative effect of development in any delineated floodplain causing increases in flood heights and velocities; and
b.  The occupancy of flood hazard areas by uses vulnerable to floods, hazardous to others, inadequately elevated, or otherwise unprotected from flood damages.
3.  Methods used to analyze flood hazards. The Flood Insurance Study (FIS) that is the basis of this article uses a standard engineering method of analyzing flood hazards which consists of a series of interrelated steps.
a.  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 article is representative of large floods which are characteristic of what can be expected to occur on the particular streams subject to this article. It is in the general order of a flood which could be expected to have a one-percent chance of occurrence in any one year as delineated on the Federal Insurance Administrator's FIS, and illustrative materials for St. Louis County, dated February 4, 2015, as amended, and any future revisions thereto.
b.  Calculation 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.
c.  Computation of a floodway required to convey this flood without increasing flood heights more than one foot at any point.
d.  Delineation of floodway encroachment lines within which no development is permitted that would cause any increase in flood height.
e.  Delineation of flood fringe, i.e., that area outside the floodway encroachment lines, but still subject to inundation by the base flood.

Statement of purpose. It is the purpose of this article to promote the public health, safety, and general welfare; to minimize those losses described in Subsection A1, above; 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 article to:
1.  Restrict or prohibit uses that are dangerous to health, safety, or property in times of flooding or that cause undue increases in flood heights or velocities;
2.  Require that 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.

The following general provisions shall apply to this article:

Lands to which article applies. This article shall apply to all lands within the jurisdiction of the City of Crestwood, Missouri, identified as numbered and unnumbered A Zones and AE Zones on the Flood Insurance Rate Maps (FIRMs) for St. Louis County on Map Panels 29189C0309K, 29189C0317K, 29189C0328K, and 29189C0336K, dated February 4, 2015, as amended, and any future revisions thereto. In all areas covered by this article, no development shall be permitted except through the issuance of a floodplain development permit granted by the Board of Aldermen or its duly designated representative under such safeguards and restrictions as the Board of Aldermen or the designated representative may reasonably impose for the promotion and maintenance of the general welfare, health of the inhabitants of the community, and as specifically noted in §§ 26-49 and 26-52 of this article.

Floodplain Administrator. The Director is hereby designated as the Floodplain Administrator under this article.

Compliance. No development located within the special flood hazard areas of this community shall be located, extended, converted, or structurally altered without full compliance with the terms of this article and other applicable regulations.

Abrogation and greater restrictions. It is not intended by this article to repeal, abrogate, or impair any existing easements, covenants, or deed restrictions. However, where this article imposes greater restrictions, the provisions of this article shall prevail. All other ordinances inconsistent with this article are hereby repealed to the extent of the inconsistency only.

Interpretation. In their interpretation and application, the provisions of this article shall be held to be minimum requirements, shall be liberally construed in favor of the governing body, and shall not be deemed a limitation or repeal of any other powers granted by state statutes.

Warning and disclaimer of liability. The degree of flood protection required by this article is considered reasonable for regulatory purposes and is based on engineering and scientific methods of study. Larger floods may occur on rare occasions or the flood heights may be increased by man-made or natural causes, such as ice jams and bridge openings restricted by debris. This article does not imply that areas outside the floodway and flood fringe or land uses permitted within such areas will be free from flooding or flood damage. This article shall not create a liability on the part of the City of Crestwood, any officer or employee thereof, for any flood damages that may result from reliance on this article or any administrative decision lawfully made thereunder.

Severability. If any section, clause, provision, or portion of this article is adjudged unconstitutional or invalid by a court of appropriate jurisdiction, the remainder of this article shall not be affected thereby.