Atlas 14 Implementation - Fort Bend County, TX
Atlas 14 ImplementationFort Bend County01/01/2020
Atlas 14 Overview A historical rainfall study completed by The National WeatherService. Published on September 28, 2018. This study shows that Central Texas is more likely toexperience larger storms than previously thought. For example, for Fort Bend County:– 100-yr 24 hour rainfall changed from 12.5in to 16.5in. NOAA Atlas 14 rainfall values are used for infrastructure designand planning activities under federal, state and localregulations. They also help delineate flood risks and manage developmentin floodplains for FEMA’s National Flood Insurance Program.
NOAA Atlas 14, Volume 11, Version 2Data can be downloaded from the following web l
NOAA Atlas 14 at Fort Bend County
Atlas 14 Rainfall for Fort Bend CountyDuration5 min10 min15 min30 min1hr2hr3hr6hr12hr1 day2 day3 day4 day7 day10 day20 day30 day45 day60 day1 705.035.816.478.5710.3012.9015.302 386.777.648.3610.5012.4015.2017.705 29.2310.3011.1013.5015.6018.8021.8010 .0011.6012.7013.7016.2018.4021.8025.00Rainfall Depths (in)25 yr50 25.6025.9029.1029.3032.30100 21.3022.1023.5024.5026.9028.9032.2035.30200 24.9025.8027.2028.2030.5032.3035.3038.20500 030.0030.9032.2033.2035.2036.8039.4041.901000 3033.9034.8036.1037.0038.8040.2042.5044.70
Fort Bend CountyAtlas 14 Adoption & Implementation Interim Atlas 14 Drainage Criteria Manual and Minimum SlabElevation Criteria. Effective 01/01/2020. Document can be downloaded from Fort Bend County website.
Approved Development Drainage Impact Analysis
Minimum Slab Elevation RequirementsAtlas 14 --- Effective 01/01/2020For locations with approved DIA using Pre-Atlas 14 rainfall New Structures :– At least 2.0 feet above existing (Pre-Atlas 14) 500-yr water surface elevation.– 2.5 feet above the existing (Pre‐Atlas 14) 100‐yr water surface elevation ormaximum ponding elevation based on an existing detention facility designedprior to the adoption of these rules.– 2.0 feet above the lowest top of curb elevation within, or adjacent to, each lot orreserve; or, in the absence of a curb, 2.0 feet above the highest natural groundalong perimeter of building foundation and 1.0 foot above any down gradientroadway or any down gradient drainage restraint, whichever is higher. New Structures in Zone A floodplain– 4.0 feet above existing (Pre-Atlas 14) estimated 100-yr BFE.
Minimum Slab Elevations RequirementsAtlas 14 --- Effective 01/01/2020For locations with approved DIA using Atlas 14 rainfall New Structures :– At least 2.0 feet above the new (Atlas 14) BFE, and no lower than the new(Atlas 14) 500-yr water surface elevation.– Detention and drainage facilities serving the new section(s) should bedesigned based on Atlas 14 100-yr rainfall.– 2.0 feet above the Atlas 14 100‐yr water surface elevation or maximumponding elevation within the detention facility.– 2.0 feet above the lowest top of curb elevation within, or adjacent to, eachlot or reserve; or, in the absence of a curb, 2.0 feet above the highest naturalground along perimeter of building foundation and 1.0 foot above any downgradient roadway or any down gradient drainage restraint, whichever ishigher.
Certification Memorandumfor a Pre-Atlas 14 Development The purpose of the “certification statement” below is to allow a MUD/LID/DevelopmentEngineer of a development (with a Pre-Atlas 14 approved report), to submit a memorandum,with the below statement, to FBCDD which will detail the Pre-Atlas 14 100-yr WSEL and PostAtlas 14 100-yr WSEL for the drainage system. This memorandum will confirm conformancewith section 4(f) of Interim Guidelines and documenting the 1-foot of freeboard from lowestslab elevation to the Atlas 14 100-yr WSEL. This memo will be prepared for each detentionbasin service area within a Pre-Atlas 14 existing development and will be in lieu of a newformal, Atlas 14 drainage report for said development. This memo is only applicable forconditions where:–Ultimate outfall size/configuration, including the extreme event outfall does not change frompreviously approved (Pre-Atlas 14) analysis/design.–Original service area defined by previously approved drainage report (Pre-Atlas 14) has not changed(such as land area or land use density).–The intent of section is to promulgate a policy which provides for continued development withoutmodification or increase of the size of the existing outfall structure.
Drainage Impact Analysis RequirementsAfter Atlas 14 --- Effective 01/01/2020 Simplified Method ( 50acre)– no changes at this time. New developments– evaluate using Atlas 14 rainfall to determine pre-development discharges.– detention facilities not to exceed pre-development discharges for the 10-yr, 25-yr,and 100-yr events.– Additionally, the 500-yr event should be evaluated to ensure no structures will beimpacted.– Upstream & downstream development coordination required. Modification of an existing development’s outfall– must not result in increases in discharges for the 10-yr, 25-yr, and 100-yr events(8.2”, 9.6”, and 12.5”) from the previous drainage criteria. Any special scenarios, please coordinate with FBCDD.
Developments with DIA under ReviewAll developments under review will be required to use Atlas 14 rainfall (effective 1/1/2020).
- At least 2.0 feet above the new (Atlas 14) BFE, and no lower than the new (Atlas 14) 500-yr water surface elevation. - Detention and drainage facilities serving the new section(s) should be designed based on Atlas 14 100-yr rainfall. - 2.0 feet above the Atlas 14 100-yr water surface elevation or maximum
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