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State study maps Great Salt Lake flood risks; FEMA review and local permitting process outlined
Summary
State emergency management and AECOM presented a statewide Great Salt Lake flood‑risk mapping study that models surge and wave effects around the lake, identifies still‑water elevations and transect‑based wave zones, and will enter FEMA review before communities use it for permitting.
A statewide flood‑risk study of the Great Salt Lake designed to give communities consistent data for permitting and floodplain management was presented to the Great Salt Lake Tech Team on Sept. 1. Jamie (identified in the transcript as both "Jamie Huss" and "Jamie Heff") of the Utah Division of Emergency Management said the project began after a request from Salt Lake County and expanded to five counties to produce a unified dataset for local use.
The study team, led by consulting firm AECOM and presented by Tom Wright of AECOM, described a full‑circle ADCIRC model coupled with wave and transect (WAFIS/SWAN) analyses to capture surge and wave action at the shoreline. Wright said the lake’s shallow depth and high salinity required modifications to coastal modeling code and that the team ran analyses in 36 directions to capture wind‑driven surge. “FEMA does not allow [future‑condition] projections,” Wright…
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