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<p class="MsoNormal">Good morning EMGIG,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As a follow-up to our request we had last month, I did want to share with you what we’d heard from you all regarding a flood mapping capability. As some of you may know, we were taking a look at a possible solution regarding real-time flood
mapping – to where we can view real-time estimations of flooding extents. Prior to going further down this road, we did want to see what you were all using for solutions to address this for your agencies/jurisdictions. We have consolidated the responses to
these questions based upon which agencies had an existing capability. Please see below results (<span style="color:red">in red</span>) from our survey (and web links for reference):<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Do you currently model flood extents outside of the typical FEMA national flood hazard dataset for active flooding?<o:p></o:p></li><ul style="margin-top:0in" type="circle">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1"><span style="color:red">Salem: yes, we have some static flood inundation maps outside the FEMA NFHL for various flood return intervals (10, 25, 50 year) that are based on a 48 hour
design storm rainfall distribution.</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1"><span style="color:red">National Weather Service: the NWS is slowly rolling out new flood inundation services for the whole continental US (<a href="https://www.weather.gov/news/232609-experimental-flood-inundation-maps">info
link</a>). NWS Portland and NWS Pendleton are part of the group of offices for which flood inundation mapping will be implemented by fall 2024 (<a href="https://storymaps.arcgis.com/stories/c7ae8422207241b5873fff38a22cf66b">storymap link</a>). Inundation layers
will be generated near real-time for observed and forecast river levels at or near flood stage and higher. Inundation modeling will be based on streamflow forecasts either from the Northwest River Forecast Center or the National Water Model. Flood inundation
maps will be available to view on the new National Water Prediction Service (what is replacing the Advanced Hydrologic Predication Service, scheduled to be operational in late March 2024) and will also be served as GIS layers.</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1"><span style="color:red">US Army Corps of Engineers: the Corps has a suite of models for streams that are regulated by reservoir operations and can offer modeling capabilities for other
non-regulated streams. USACE run scenarios from bankfull/non-damaging floods up to a large flood. Work is not necessarily tied to FEMA datasets but can lead to updates if desired.</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1">If so, what modeling do you have access to and how do you formulate those boundaries?<o:p></o:p></li><ul style="margin-top:0in" type="square">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level3 lfo1"><span style="color:red">Salem: we have a HEC-HMS model for a few of our more impactful streams. The model inputs included antecedent stream levels and rainfall, and quantitative precipitation
forecasts. Model outputs include a project hydrograph, peak flow rates, and timing. These outputs are then used to determine the appropriate static flood inundation map (or set of maps)</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level3 lfo1"><span style="color:red">National Weather Service: the NWS is slowly rolling out new flood inundation services for the whole continental US (<a href="https://www.weather.gov/news/232609-experimental-flood-inundation-maps">info
link</a>). NWS Portland and NWS Pendleton are part of the group of offices for which flood inundation mapping will be implemented by fall 2024. Inundation layers will be generated near real-time for observed and forecast river levels at or near flood stage
and higher. Inundation modeling will be based on streamflow forecasts either from the Northwest River Forecast Center or the National Water Model. Flood inundation maps will be available to view on the new National Water Prediction Service (what is replacing
the Advanced Hydrologic Predication Service, scheduled to be operational in late March 2024) and will also be served as GIS layers.</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level3 lfo1"><span style="color:red">US Army Corps of Engineers: We have a range of models available and modelling capabilities available. Available models include:</span><o:p></o:p></li><ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level4 lfo1"><span style="color:red">Willamette from the federally authorized dams down to the mouth of the Columbia. We have some modeling for a handful of non-regulated streams.</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level4 lfo1"><span style="color:red">Ability to develop models using modelers available at the Corps.</span><o:p></o:p></li></ul>
</ul>
</ul>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Would pre-event forecasting information be beneficial to you?<o:p></o:p></li><ul style="margin-top:0in" type="circle">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1"><span style="color:red">All partners said yes to this question</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1"><span style="color:red">US Army Corps of Engineers: with all the maps available, there has been some interest in hosting a map to include API calls for inundation mapping.</span><o:p></o:p></li></ul>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Do you perform any post-event analysis to determine the extent of the flooding for given areas?<o:p></o:p></li><ul style="margin-top:0in" type="circle">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1"><span style="color:red">Salem: yes, but not to formulate boundaries but rather to identify discrepancies between xpstorm modeled links and nodes outputs (used to create our inundation
maps) and areal flooding. This is done to QC our static inundation maps, identify shortcomings with the maps, and to identify conveyance issues (excessive aggradation, culvert blockage, etc).</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1"><span style="color:red">US Army Corps of Engineers: we sometimes map inundation mapping for big events, we sometimes collect high water marks to calibrate our models.</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1">If so, what modeling do you have access to and how do you formulate those boundaries?<o:p></o:p></li><ul style="margin-top:0in" type="square">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level3 lfo1"><span style="color:red">US Army Corps of Engineers: we will run our models for each forecast, we coordinate with the National Weather Service in creating models and inform forecasts.
We will create inundation maps in real-time or rely on static maps we already create.</span><o:p></o:p></li></ul>
</ul>
</ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">At this point in time, we are not looking at purchasing any data services and will be evaluating the information that we have received from our partners. We’re sharing this information for your awareness. Please feel free to reach out with
any questions that you may have. Thank you all for helping respond to our request for information!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="https://www.oregon.gov/oem"><span style="font-size:10.0pt;color:windowtext;text-decoration:none"><img border="0" width="78" height="89" style="width:.8083in;height:.925in" id="Picture_x0020_15" src="cid:image001.png@01DA6E12.C0AE0E30"></span></a><span style="font-size:10.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt">Daniel Stoelb | GIS Program Coordinator</span></b><span style="font-size:10.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Response Section<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Oregon Department of Emergency Management<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Office 503-378-3234<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Cell 971-719-0917<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:115%"><span style="font-size:10.0pt;line-height:115%"><a href="mailto:daniel.stoelb@oem.oregon.gov"><span style="color:blue">d</span><span style="font-size:11.0pt;line-height:115%;color:blue">aniel.stoelb</span><span style="color:blue">@oem.oregon.gov</span></a><span style="color:#767171"><o:p></o:p></span></span></p>
<p class="MsoNormal" style="line-height:115%"><a href="https://www.facebook.com/OregonOEM"><span style="font-size:10.0pt;line-height:115%;color:windowtext;text-decoration:none"><img border="0" width="20" height="20" style="width:.2083in;height:.2083in" id="Picture_x0020_10" src="cid:image002.png@01DA6E12.C0AE0E30"></span></a><span style="font-size:10.0pt;line-height:115%"> </span><a href="https://twitter.com/OregonOEM"><span style="font-size:10.0pt;line-height:115%;color:windowtext;text-decoration:none"><img border="0" width="19" height="19" style="width:.2in;height:.2in" id="Picture_x0020_11" src="cid:image003.png@01DA6E12.C0AE0E30" alt="Image result for twitter icons"></span></a><span style="font-size:10.0pt;line-height:115%"> </span><a href="https://www.youtube.com/c/OregonOEM"><span style="font-size:10.0pt;line-height:115%;color:windowtext;text-decoration:none"><img border="0" width="20" height="20" style="width:.2083in;height:.2083in" id="Picture_x0020_16" src="cid:image004.png@01DA6E12.C0AE0E30" alt="Image result for youtube icons"></span></a><span style="font-size:10.0pt;line-height:115%"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><i><span style="font-size:10.0pt">OEM GIS Hub:</span></i></b><span style="font-size:10.0pt">
<a href="https://oregon-oem-geo.hub.arcgis.com/"><span style="color:blue">https://oregon-oem-geo.hub.arcgis.com</span></a></span><span style="font-size:10.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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