BULLET St. Louis City Revised Code Chapter 26.76 Flood Plains Areas Article I

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Chapter 26.76
Flood Plains Areas

Article I. Establishment--Purpose--Methods


26.76.010 Establishment of area regulations.
26.76.011 Purpose.
26.76.012 Methods used to analyze flood hazards.

26.76.010 Establishment of area regulations.

This chapter contains the regulations for the floodplain area. These regulations are supplemental and qualified by additional general regulations appearing elsewhere in this zoning code, which are incorporated as part of this chapter by reference.
(Ord. 65420 1 (part), 2001.)

26.76.011 Purpose.

The special flood hazard areas of the City of Saint Louis, MO 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.

These flood losses are caused by (1) the cumulative effect of development in any delineated floodplain causing increases in flood heights and velocities; and (2) the occupancy of flood hazard areas by uses vulnerable to floods, hazardous to others, inadequately elevated, or otherwise unprotected from flood damages.

It is the purpose of this chapter to promote the public health, safety, and general welfare; to minimize losses; to establish or maintain the City'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. Require 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.
(Ord. 65420 1 (part), 2001.)

26.76.012 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.

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 chapter is representative of large floods which are characteristic of what can be expected to occur on the particular streams subject to the ordinance codified in this chapter. 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 dated March 15, 1993, 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 (1) 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.
(Ord. 65420 1 (part), 2001.)

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