DETERMINATION OF THE 100-YEAR FLOODPLAIN.
Austin City Code § 25-7-6
in effect25-7-6 - DETERMINATION OF THE 100-YEAR FLOODPLAIN.
For purposes of this chapter, the 100-year floodplain shall be:
(A) For areas amended to incorporate Atlas 14 data, the 100-year floodplain calculated under fully developed conditions as prescribed by the Drainage Criteria Manual as amended to incorporate Atlas 14 data;
(B) For areas not yet amended to incorporate Atlas 14 data, the 500-year floodplain either as depicted on the FEMA Flood Insurance Rate Map as of January 6, 2016, as subsequently revised, or as calculated under existing conditions as prescribed by the Drainage Criteria Manual using data predating Atlas 14; or
(C) For the Colorado River, the 100-year floodplain as depicted on the FEMA Flood Insurance Rate Map dated January 6, 2016, as subsequently revised.
Source: Ord. No. 20191114-064, Pt. 6, 11-25-19.
Source: City of Austin, City Code and City Charter (Municode Library, library.municode.com)URL: https://library.municode.com/tx/austin/codes/code_of_ordinances?nodeId=TIT25LADE_CH25-7DR_ART1GEPR_25-7-6DE100-YEARFLFetched: 10/27/2026