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Carencro |
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Code of Ordinances |
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Chapter 30. FLOODS |
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Article VI. FLOOD AND DRAINAGE PROTECTION STANDARDS |
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Division 1. GENERALLY |
§ 30-92. Definitions.
The following words, terms and phrases, when used in this article, shall have the meanings ascribed to them in this section, except where the context clearly indicates a different meaning:
500-year flood zone, identified as "X" by the light gray area on the Federal Emergency Management Agency flood insurance rate map, means an officially designated land area that is likely to be flooded by a storm equal to or greater in intensity than the 500-year storm event.
Flood hazard area and 100-year flood zone, identified with an "A" with or without a suffix, means an officially designated land area on the latest Federal Emergency Management Agency flood insurance rate map that is likely to be flooded by a storm equal to or greater in intensity than the 100-year storm event.
Floodway means land identified on the Federal Emergency Management Agency flood insurance rate map or a floodway map as a floodway. Development, fill, overlays, etc., shall not occur on land identified as a floodway unless hydrologic and hydraulic HEC-2 data or other model acceptable to the applicable regulatory agency prepared by a state licensed engineer is presented certifying that no adverse flooding will occur upstream, downstream or on the development site as a result of the proposed improvements. The data must be reviewed and subsequently approved by the Federal Emergency Management Agency, the local floodplain administrator prior to development, and other applicable regulatory agencies.
Tailwater (TW) is defined as the flow depth of the downstream channel or pipe measured from the flow line of the outlet structure or culvert. Tailwater is considered to be an important factor in outfall structure or culvert hydraulic design because a submerged outlet may cause structures or culverts to flow full, rather than partially full, thereby impacting the hydraulic efficiency of the drainage system. The hydraulic analysis of the drainage system shall address the tailwater elevation of the outfall channel. The tailwater elevation of the outfall channel shall be set at top bank and/or flowing full level (i.e., top of pipe) for sub-surface drainage systems unless otherwise determined to be lower through a hydraulic analysis for the applicable design storm event.
(Ord. No. 2002-017, § 2, 5-20-2002; Ord. No. 2017-013 , § 2, 11-20-2017; Ord. No. 2018-017 , § 2, 12-17-2018)