35 Ill. Adm. Code 501.395
100-Year, 24-Hour Precipitation Event
Section 501.395 100-Year, 24-Hour Precipitation Event
The maximum 24-hour precipitation
event with a probable recurrence interval of once in 100 years, as defined by
NOAA Atlas 14; Precipitation Frequency Atlas of the United States, incorporated
by reference in Section 501.200.