FLOOD00918

• County: Larimer
• Community: Fort Collins
• Title: Precipitaion Frequency Study
• Date: 7/16/1998
• Prepared For: Fort Collins
• Prepared By: WRC Engineering, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Table 4
CSU Precipitation Frequency Analyses Results *
Fort Collins Precipitation Gage
Gage Number 05-3005
Source 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year
Site GEV Results for 1948-1997 1-hr Partial Duration 0.82 1.14 1.40 1.81 2.18 2.61
Renional GEV Results for 1948-1997 1-hr Partial Duration 0.80 1.18 1.46 1.84 2.12 2.40
Site GEV Results for 1948-1996 2-hr Partial Duration 0.92 1.33 1.69 2.32 2.93 3.71
Site GEV Results for 1948-1997 2-hr Partial Duration 0.93 1.38 1.81 2.57 3.35 4.37
Reaional GEV Results for 1948-1996 2-hr Annual Series 0.82 1.26 1.61 2.15 2.63 3.19
Reaional GEV Results for 1948-1996 2-hr Partial Duration ** 0.93 1.31 1.63 2.15 2.63 3.19
Reoional GEV Results for 1948-1997 2-hr Partial Duration 0.98 1.36 1.71 2.31 2.91 3.67
Site GEV Results for 1948-1996 6-hr Annual Series 1.08 1.62 2.03 2.60 3.07 3.57
Site GEV Results for 1948-1996 6-hr Partial Duration ** 1.23 1.68 2.05 2.60 3.07 3.57
Site GEV Results for 1948-1997 6-hr Annual Series 1.07 1.70 2.23 3.07 3.84 4.76
Site GEV Results for 1948-1997 6-hr Partial Duration ** 1.22 1.77 2.25 3.07 3.84 4.76
Reaional GEV Results for 1948-1996 6-hr Annual Series 1.09 1.56 1.92 2.43 2.85 3.32
Regional GEV Results for 1948-1996 6-hr Partial Duration ** 1.24 1.62 1.94 2.43 2.85 3.32
Reaional GEV Results for 1948-1997 6-hr Annual Series 1.14 1.66 2.08 2.69 3.22 3.82
Reaional GEV Results for 1948-1997 6-hr Partial Duration ** 1.30 1.73 2.10 2.69 3.22 3.82
Site GEV Results far 1948-1996 24-hr Annual Series 1.57 2.31 2.91 3.80 4.57 5.46
Site GEV Results for 1948-1996 24-hr Partial Duration ** 1.79 2.40 2.94 3.80 4.57 5.46
Site GEV Results for 1948-1997 24-hr Annual Series 1.59 2.41 3.11 4.25 5.30 6.58
Site GEV Results for 1948-1997 24-hr Partial Duration ** 1.81 2.51 3.14 4.25 5.30 6.58
Reaional GEV Results for 1948-1996 24-hr Annual Series 1.61 2.31 2.84 3.62 4.27 4.99
Reaional GEV Results for 1948-1996 24-hr Partial Duration ** 1.84 2.40 2.87 3.62 4.27 4.99
Reaional GEV Results for 1948-1997 24-hr Annual Series 1.67 2.42 3.01 3.89 4.64 5.49
Regional GEV Results for 1948-1997 24-hr Partial Duration ** 1.90 2.52 3.04 3.89 4.64 5.49
NOAA Alias 2 2-hr Partial Duration 1.18 1.68 2.00 2.43 2.81 3.19
NOAA Atlas 2 24-hr Partial Duration 2.01 2.70 3.14 3.74 4.27 4.84
NOAAlNWS Results IL Moment\ 24-hr Partial Duration 2.02 2.62 3.09 3.72 4.18 4.64

* Prepared by: Oli Sveinsson (See Appendix F)
** Refer to figure 3 for correlation values