; (B) analyses of seasonality in precipitation; and (C) trends in annual maximum series data; and (2) may serve as the official source of the Federal Government on estimates of precipitation frequency and associated information with respect to the United States. (d) Requirements (1) Coverage The NOAA Precipitation Frequency Atlas of the United States shall include such estimates of the frequency of precipitation in the United States as the Administrator determines appropriate. (2) Frequency Such estimates— (A) shall be conducted not less frequently than once every 10 years; and (B) may be conducted more frequently if determined appropriate by the Administrator. (3) Publication Such estimates and methodologies used to conduct such estimates shall be— (A) subject to an appropriate, scientific process, as determined by the Administrator