Water Resources of the United States

PROJECT ALERT NOTICE (HI) Moderate Flooding in Hawaii

Date: Mon, 08 Mar 2021 23:01:08 EST

Summary: Moderate-Major flooding ongoing in Hawaii

An upper level disturbance interacting with tropical moisture is resulting in widespread rainfall and isolated flooding. Currently the island of Maui has been most impacted.

West Wailuaiki rain gage (204916156083701) recorded 10.4" of rain in the last 24 hours. One station in East Maui, Honopou Stream (16587000), exceeded NWS major flood stage and experienced a provisional peak of record out of 108 years of record. No streamgages have been damaged.

An ungaged reservoir in East Maui was breached, resulting in localized flooding and evacuations. A flash flood watch continues for the entire State through Tuesday evening.

No USGS crews currently deployed. Most sites are in small, flashy, and remote basins that are difficult and unsafe to measure directly. Crews are expected to be deployed later in the week to collect and survey high water marks and cross-sections for indirect computations. USGS crews may assist other agencies with surveying efforts on the breached dam.

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