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30 City of Portland HYDRA Rainfall Network Explanation 18 Active Rain Gage and Station Number (click with mouse to see rainfall record) 18 Discontinued Rain Gage and Station Number (click with mouse to see rainfall data table) 139 137 Vancouver 82 167 Camas 160 TWashougal 125 41 220 115 159 221 193 153 204 Maywood Park 121 122 152 111 117 228 235 12 162 173 Fairview Wood Village 2300 Portland Trogtdale 171 175 161 164 181 120 229 174 14 89 227 214 0234 | 172 10 64 145 TH 146 Gresham 8.2012 Beaverton. Milwaukie Happy Valley t Tigard Lake Oswego Johnson City King Citypurhan Gladstone Sandy Ez Riverstore Reminder: Show all of your work. Your final answer must be in the units [identified in hard brackets) in the problem statements. Be sure to clearly state all assumptions. . 1. Mining Rainfall Data for REAL. Consider the attached maps showing the Johnson Creek watershed and the locations of rainfall gauging stations currently in Portland's HYDRA network. As we will cover will class, you can see that the stations contributing to the overall hydrology of the Johnson Creek watershed are identified with Station IDs as follows: 14 20 64 145 146 174 217 Visit the USGS website reporting measured rainfall data for each of these listed gauging stations. You will find that using this interactive map (linked herein) will be very handy. Namely, click on the station ID in the map (http://or.water.usgs.gov/precip/raingage info/clickmap.html) and then search the data table associated with each station. Determine the total rainfall [in] measured at each station for the recent storm that began at about 11 PM on October 28th and lasted through the early morning of October 29th. 2. Let's Do Some of our Own Mapping. Using the attached map of the Johnson Creek watershed as a construction template (reproducing the watershed on your grid paper), generate Thiessen polygons to determine the watershed's area (mi?) associated with each gauging station identified in problem number 1. 3. Crunch, Crunch, Crunch (did someone say potato chips?!) Using the Thiessen method, what is the weighted-average volume of rainfall [acre-ft; gallons; and m’] that fell on the watershed during that particular storm referenced in problem number 1. 122°45 12230 122'15 0 2 4 6 8 10 MILES Witamente Portland International Airport 45 35 0 2 4 6 8 10 KILOMETERS Columbia Slough RIWER MULTNOMAH Portland Johnson Creek drainage basin Gresham 30 Creck Lohnson fumes Milwaukee Happy Valley 45° 25 Damascus bunatatim Ahead Clackamas Rine Eagle CLACKAMAS 45 20 GR

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