FLOOD02665

• County: Larimer
• County: Weld
• Community: Larimer and Weld Counties
• Stream Name: Cache La Poudre River Basin
• Basin: South Platte
• Title: Special Study Cache La Poudre River Basin Volume II - Hydrology
• Date: 10/1/1981
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Floodplain Report/Masterplan

Table 8
Fort Collins Design Storms
. Total Frecipitation
(in. )
2 hr - 5 min Storms
Time lE. ~ 10 yr 25 yr 50 yr 100 yr Percent
5 0.27 0.39 0.47 0.57 0.66 0.75 26
10 0.42 0.60 0.73 0.88 1.03 1.17 15
15 0.53 0.77 0.92 1.12 1.30 1.48 11
20 0.61 0.90 1.1') 1.31 1.50 1.73 9
25 0.68 0.99 1.20 1.44 1.67 1.91 6
30 0.73 1.06 1.28 1.55 1.81 2.05 5
35 0.77 1.12 1.35 1.64 1.93 2.18 4
40 0.80 1.17 1.41 1.72 2.02 2.30 4
45 0.84 1.22 1.47 1. 79 2.10 2.40 3
50 0.87 1.26 1.52 1.85 2.17 2.48 3
55 0.90 1.30 1.57 1.91 2.23 2.55 2
60 0.93 1.34 1.62 1.97 2.29 2.60 2
65 0.96 1.37 1.66 2.01 2.34 2.65 2
70 0.98 1.40 1.70 2.05 2.38 2.69 1
75 1.00 1.43 1. 73 2.08 2.41 2.72 1
80 1.02 1.45 1.75 2.ll 2.44 2.75 1
85 1.03 1.47 1.77 2.14 2.46 2.77 1
90 1.04 1.49 1.78 2.17 2.48 2.79 1
95 1.05 1.50 1.79 2.19 2.50 2.81 1
100 1.06 1.51 1.80 2.21 2.52 2.83 1
105 1.07 1.52 1.81 2.22 2.54 2.85 1
110 1.08 1.53 1.82 2.23 2.56 2.87 1
ll5 1.09 1.54 1.83 2.24 2.56 2.88 0
120 1.10 1.55 1.84 2.25 2.57 2.89 0
3 hr - 10 min Storms
10 0.42 0.60 0.73 0.88 1.03 1.17 38
20 0.61 0.90 1.10 1.31 1.50 1.73 18
30 0.73 1.06 1.28 1.55 1.81 2.05 10
40 0.80 1.17 1.41 1.72 2.02 2.30 8
50 0.87 1.26 1.52 1.85 2.17 2.48 6
60 0.93 1.34 1.62 1.97 2.29 2.60 4
70 0.98 1.40 1.70 2.05 2.38 2.69 3
80 1.02 1.45 1.75 2.11 2.45 2.75 2
90 1.05 1.49 1.79 2.17 2.50 2.79 1
100 1.07 1.52 1.82 2.21 2.54 2.83 1
110 1.09 1.55 1.85 2.25 2.57 2.87 1
120 1.11 1.58 1.88 2.29 2.60 2.91 1
130 1.13 1.61 1.91 2.33 2.63 2.95 1
140 LIS 1.63 1.93 2.36 2.66 2.99 1
150 1.17 1.65 1.95 2.39 2.69 3.02 1
160 1.19 1.67 1.97 2.42 2.72 3.05 1
170 1.21 1.69 1.99 2.44 2.75 3.08 1
. 180 1.23 1.71 2.01 2.46 2.77 3.11 1
SOURCE: Resource Consultants, Inc.
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