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NOAA ATLAS 14 UPDATE <br />THE CHANGE VALUES <br />SHOWN ARE BASED ON THE <br />ATLAS 14, VOLUME 11 (2018) <br />RAINFALL DEPTH MINUS THE <br />TP-40 (1961) RAINFALL DEPTH. <br />THE ACTUAL CHANGE IS NOT <br />AS GREAT AS THAT DEPICTED. <br />100-YEAR ESTIMATES AROUND <br />HOUSTON INCREASED FROM 13 <br />INCHES TO 18 INCHES. <br />HARRIS COUNTY HAS BEEN <br />USING ADJUSTED RAINFALL <br />VALUES FROM THE TROPICAL <br />STORM ALLISON RECOVERY <br />PROJECT (2007) FOR THE LAST 11 <br />YEARS. <br /> <br />