Title 18 - Unified Development Ordinance

18.360.420 Statutory Authorization and Findings of Fact

1. A.
   Statutory Authorization

   1. 1.
      Approval of Draft Ordinance by Kansas Chief Engineer Prior to Adoption

      The following floodplain management regulations, as written, were approved in draft form by the Chief Engineer of the Division of Water Resources of the Kansas Department of Agriculture on April 22, 2019.

   2. 2.
      Kansas Statutory Authorization

      The Legislature of the State of Kansas has in K.S.A. 12-741 et seq. as amended, and specifically in K.S.A. 12-766 as amended, delegated the responsibility to local governmental units to adopt floodplain management regulations designed to protect the health, safety, and general welfare. Therefore, the Governing Body ordains as follows:

2. B.
   Findings of Fact

   1. 1.

      Flood Losses Resulting from Periodic Inundation
      The Special Flood Hazard Areas of the City 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. 2.
      General Causes of the Flood Losses

      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.

   3. 3.
      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. 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 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 August 3, 2009, as amended, and any future revisions thereto.
      2. b.
         Calculation of water surface profiles that are based on a standard hydraulic engineering analysis of the capacity of the stream channel and over bank areas to convey the base flood.
      3. c.
         Computation of a floodway required to convey this flood without increasing flood heights more than one (1) foot at any point.
      4. d.
         Delineation of floodway encroachment lines within which no development is permitted that would cause any increase in flood height.
      5. e.
         Delineation of flood fringe, i.e., that area outside the floodway encroachment lines, but still subject to inundation by the base flood.

(History: Ord. ZRR-3250 §4, 2019; Ord. ZRR-2812 §8, 2009; ZRR-2450 §3, 2003)

Effective on: 1/1/1901