Kenai River Cross-Sections
This interagency project - along with the Kenai Peninsula Borough - surveyed 55 cross-sections from Skilak Lake to the mouth of the Kenai River. This effort directly supports the Kenai Borough efforts in updating their flood maps. The data collected also supports the requirements of modeling and publishing to the NOAA Advanced Hydrologic Prediction Service (AHPS) site for real-time flood warnings and inundation mapping.
USGS Gage Survey to NAVD 88 Datum
The Alaska District in cooperation with USGS completed the tie-in to NAVD88 datum of 29 USGS gages across the State. This effort began in FY16 and was completed in FY17. This effort supports the USGS and NOAA Alaska Pacific River Forecast Center for flood warnings and potential inundation mapping for the areas surveyed.
Willow Creek Scenario Inundation Mapping (FY17)
This interagency project includes the Alaska Railroad Corporation (ARRC), DOT&PF, USGS, NOAA/NWS, Mat-Su Borough, State DCRA and DHS&EM, and FEMA as Partners. The recently updated NFIP maps in the Mat-Su Borough are limited to the 100-yr and 500-yr inundation extents. At Willow Creek, larger floods may occur and render the railroad and DOT bridges impassable, preventing transportation in to and out of the area. This study will build on the FEMA models and generate additional flood scenario maps to inform the community, ARRC and DOT&PF of potential high water flows and the consequences associated.
Koyukuk Floodplain Information Report
This interagency project documented the complex flood history of the community of Koyukuk - situated along the Yukon River near the confluence of the Koyukuk River. Historical inundation maps were developed by consolidating oral food history reports, high water mark surveys, and documented flood reports. The study will be used to update the community Hazard Mitigation Plan, provide flood risk information to community residents, and inform future development in the area.
Juneau Jokulhlaup Inundation Mapping
This interagency project provides modeling and mapping of inundation caused by glacial-outburst or jokulhlaup flooding on the Mendenhall River in Juneau, Alaska. Jokulhlaup, an Icelandic word for an event from a country that's been dealing with this phenomenon for years, has recently created record-level floods in within Alaska that are predicted to continue. Recent updates to FEMA Flood Insurance Rate Maps did not include floods resulting from glacial outburst events. Therefore, the Alaska District worked closely with the City and Borough of Juneau (CBJ) and the hydrologist from the Alaska-Pacific River Forecast Center to conduct high water mark surveys, develop river hydraulic modeling, and determine flooding boundaries for the Mendenhall River. Continue reading
Bi-Lingual Poster Brings Flood Risk Reduction Messages to the Inupiat
Throughout the summer of 2014, the State of Alaska Silver Jackets team partnered with the Northwest Arctic Borough to design a bi-lingual English and Inupiat poster detailing simple measures that people can take to reduce their flood risk. The Borough was able to provide translation services through The Aqqaluk Trust, a non-profit entity that works to provide education on language and culture of the Inupiaq people of northwest Alaska. The poster was printed and mailed to the cities, tribes, and other public entities throughout the Northwest Arctic Borough in an effort to effectively provide information about flood risks. The team is hopeful that this effort can help inform people about their risks and steps they can take to manage that risk.