FLOOD02591

• County: El Paso
• Community: Colorado Springs, El Paso County
• Stream Name: Monument Creek
• Basin: Arkansas
• Title: Baseline Hydrology Monument Creek
• Date: 11/1/1991
• Prepared For: Colorado Springs
• Prepared By: Kiowa Engineering Corporation
• Floodplain - Doc Type: Floodplain Report/Masterplan

is identified in Guidelines for Detennining Flood Flow Frequency (DOl. 1982) as the approach
most appropriate for estimating extreme event discharges.
TableS Estimated Discharges in Monument Creek at Pike,'iew, Colorado
(all discharges in cfs)
Option I Option 2 Option 3
Exceedance Expected Expected Expe<::ted
Probability Computed Probability Computed Probability Computed Probability
(RetumPeriod)Discharge Discharge Discharge Discharge Discharge Discharge
0.002(500 yr) 10,300 14.200 164,000 454,000 49,200 104,000
0.005 (200 yr) 7,880 10,100 73,500 149,000 27,700 46,900
o.OtO (100 yr) 6,320 7.640 39,500 66,000 17,600 26,000
0.020 (SO yr) 4.970 5,730 21,000 30.000 11,100 14,600
0.040 (25 yr) 3.810 4,210 11.000 13,800 6,800 8,140
0.100(10 yr) 2,520 2.660 4,490 5,030 3,410 3,730
0.200 {5 yr) 1.710 1.760 2.190 2.300 1.9]0 ],990
0.500 (2 yr) 815 815 743 743 753 753
0.800 38' 377 35' 352 368 360
0.900 263 249 276 26' 213 264
0.950 191 m '" 226 222 210
0.990 105 87 190 183 162 150

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Runoff Model
The runoff model used to determine the peak flows and volumes within the study area is
the HEC-] l;omputer program developed by the COE Hydrologic Engineering Center. The use
of this hydrological model is in conformance WLlh the City 01 COlorado Springs/El Paso CoulIlY
Drainage Criteria Mallual. BEe. I hydrologic modeling was specincd by the Cit)' of Colorado
Springs for use in this Drainage Basin Planning Study.

BasinCharlli:teristics
The area of stud~ for this hydrologic evaluation is the Monument Creek basin. as shown
on Figure 2. The Monumem Creek Dr:linagc Basin has been divided imo 30 regional basins.
1l1e~regiol1alba;;insarelistedinTable2andshownonFigure5. :-.1ostofthese 30 basins have

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