FLOOD10311 ‎(2)‎

• County: Rio Grande
• Community: South Fork
• Stream Name: Willow Creek Watershed
• Basin: Rio Grande
• Title: Hydrologic Analysis Willow Creek
• Date: 3/27/2006
• Floodplain - Doc Type: Floodplain Report/Masterplan

Appendix 1. Willow Creek I-hour design storm distribution for the 10-,50-, 100-, and
500-yr recurrence intervals.
Appendix Table 1. Willow Creek rainfall distribution
Minutes Cumulative rainfall amount each minute of storm distribution
from 10 yr 1 hr 50 yr 1 hr 100 yr 1 hr 500 yr 1 hr
beginning Percentage of storm storm storm storm
of storm total rainfall (1.35 in. total) (1.80 in. total) (2.40 in. total) (2.60 in. total)
0001 0.000 0.000 0.000 0.000 0.000
0002 0.008 0.011 0.014 0.019 0.021
0003 0.016 0.022 0.029 0.039 0.042
0004 0.025 0.033 0.044 0.059 0.064
0005 0.033 0.045 0.060 0.080 0.087
0006 0.043 0.057 0.077 0.102 0.111
0007 0.052 0.071 0.094 0.126 0.136
0008 0.063 0.085 0.113 0.151 0.164
0009 0.074 0.100 0.134 0.178 0.193
0010 0.086 0.117 0.155 0.207 0.224
0011 0.099 0.134 0.178 0.238 0.257
0012 0.112 0.152 0.202 0.270 0.292
0013 0.127 0.171 0.228 0.304 0.329
0014 0.142 0.192 0.256 0.341 0.369
0015 0.160 0.215 0.287 0.383 0.415
0016 0.180 0.243 0.324 0.432 0.468
0017 0.205 0.277 0.369 0.492 0.533
0018 0.255 0.344 0.459 0.612 0.663
0019 0.345 0.466 0.621 0.828 0.897
0020 0.437 0.590 0.787 1.049 1.136
0021 0.530 0.716 0.954 1.272 1.378
0022 0.603 0.814 1.085 1.447 1.568
0023 0.633 0.855 1.139 1.519 1.646
0024 0.660 0.891 1.188 1.584 1.716
0025 0.684 0.923 1.231 1.642 1.778
0026 0.705 0.952 1.269 1.692 1.833
0027 0.724 0.977 1.303 1.738 1.882
0028 0.742 1.002 1.336 1.781 1.929
0029 0.759 1.025 1.366 1.822 1.973
0030 0.775 1.046 1.395 1.860 2.015
0031 0.790 1.067 1.422 1.896 2.054
0032 0.804 1.086 1 .448 1.930 2.091
0033 0.818 1.104 1.472 1.963 2.127
0034 0.831 1.122 1.496 1.995 2.161
0035 0.844 1.139 1.519 2.025 2.194
0036 0.856 1.156 1.541 2.055 2.226
0037 0.868 1.172 1.562 2.083 2.256
0038 0.879 1.187 1.582 2.110 2.285
0039 0.890 1.201 1.602 2.136 2.313
0040 0.900 1.215 1.620 2.160 2.341
0041 0.910 1.229 1.639 2.185 2.367
0042 0.920 1.242 1.656 2.208 2.392
0043 0.930 1.255 1.673 2.231 2.417
0044 0.939 1.268 1.690 2.254 2.442
0045 0.948 1.280 1.707 2.276 2.466
0046 0.957 1.292 1.723 2.298 2.489
0047 0.966 1.304 1.739 2.319 2.512
0048 0.975 1.316 1.754 2.339 2.534
0049 0.983 1.327 1.770 2.360 2.556
0050 0.992 1.339 1.785 2.380 2.578
0051 1.000 1.350 1.800 2.400 2.600