Antecedent Conditions

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Thursday, September 12: • While flooding continued in many areas, the severity of flooding would only increase on the evening of September 12 th . Heavy rain, while not as widespread as the previous day, had a greater impact on stream levels as streams were already elevated and the ground was completely saturated. Rainfall rates still approached 1.5” per hour in the heaviest cells. 5 PM Sept 12
Thursday, September 12: • The image below shows the two peaks of flows on Boulder Creek near downtown. The peak flow on the evening of September 12 th surpassed the 1969 Boulder flood, but fell short of the 1938 and 1894 floods. Boulder Stream Gauge – peak flows occurred near 1 AM on Sep 12, and 9 PM Sep 12
Page 1 and 2: Antecedent Conditions: • Record t
Page 3 and 4: Tuesday, September 10 (cont.): •
Page 5 and 6: Wednesday, September 11: • Initia
Page 7 and 8: Wednesday, September 11: • Howeve
Page 9 and 10: Wednesday, September 11: • By 9 P
Page 11 and 12: Wednesday, September 11: • 10 PM
Page 13 and 14: Thursday, September 12: • Atypica
Page 15 and 16: Thursday, September 12: Boulder cou
Page 17: Thursday, September 12: • Heavy R
Page 21 and 22: Friday, September 13: • Rain fina
Page 23 and 24: Friday, September 13: • 24 Hour R
Page 25 and 26: Friday, September 13: • 24 Hour R
Page 27 and 28: Sunday, September 15: • The last
Page 34 and 35: How Historic was the Rainfall? Annu

Antecedent Conditions

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