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SEITIIITWO Colorado Springs Figure 2.2-3 Daily Discharge for North Gate Blvd. At USAF Academy, Colorado - September, 2001 USGS 07108780 MONUMENT C AB N.GATE BLVD AT USAF ACADEMY. CO. CI z: c U LLJ (/".I .:.:: LLJ Q.. I- LLJ LLJ LL.. U """"" Q:I :. u 8 7 6 5 4 IT 2 .. LLJ c.,:I .:.:: a: ::c u (/".I """"" CI ~ 0.5 ~ Sep 01 CI 1 Sep 08 Sep 15 Sep 22 DATES: 09/01/2001 to 09/30/2001 Sep 29 EXPLANATION --- DAILY HE AN DISCHARGE --- HEDIAN DAILY STREAHFLO~ BASED ON 14 YEARS OF RECORD x HEASURED DISCHARGE Figures 2.2-2 and 2.2-3 compare the daily mean discharge and the median daily stream flows based on several years of data. [Note for black and white copies: In Figure 2.2-2 the daily mean discharge data series is beneath the streamflow data series that is based on the 41 years of record. In Figure 2.2-3 the daily mean discharge data series has higher peaks and valleys than the streamflow data series that is based on the 14 years of record.] A frequency analysis of the data using the USGS software PEAKFQ indicates that based on yearly peak discharges for the period of record (41 years for Fountain Creek and 14 years for Monument Creek), stream flow on September 1 st was less than a I-year frequency event, indicating that this event did not significantly impact the larger creeks in Colorado Springs. 2.3 EXTENT OF FLOODING 2.3.1 Affected Streams and Local Drainage Areas The most intense part of the storm was very localized, affecting only a small area near downtown. Monument Creek was impacted by the storm, according to Mr. Thorson, but no creeks were reported to have overtopped their banks. 2.3.2 Inundation Limits Figure 2.1-2 shows two areas impacted by the storm: 1. Interstate 25 at Bijou Street, and 2. Monument Creek at Colorado Avenue. URS T:\PROJ ECTS\6844888 _ CWCB _FLOOD_DOC _RPTS\SUB _00\6.0 _PROJ_DELlV\REPORT\FI NAL REPORT .2. D0020-MAR-021 \ 2 - 5