Development of a Low Flow Early Warning System for the NOAA National Weather Service, USA
For example, the National Weather Service in the United States has implemented the Advanced Hydrologic Prediction Service (AHPS), which currently provides river flow/stage and forecast information at more than 3,600 forecast points across the country. Along with this information, AHPS describes potential flood impacts that may occur within the upstream and downstream influence of the forecasts points. However, similar information is not available for low flow events. In order to incorporate low flow information into the current AHPS river forecast database, the National Weather Service has undertaken pilot studies to obtain relevant low flow impact information near 83 forecast points in the Upper Mississippi, Upper Missouri, and North Platte River Basins of the United States.
The National Drought Mitigation Center (NDMC) was contracted to compile low flow impact information through surveys of the literature and information provided by more than 160 local, state, tribal, and federal water authorities. These studies, conducted from 2004 to 2006, yielded a variety of potential low flow impacts in each region. The impact information will be used to establish critical low flow and stage determinations for each forecast point and eventually incorporated into the AHPS database. Identifying this type of local impact information allows regional and national stakeholders to better understand their vulnerabilities and better prepare for and respond to potentially hazardous situations. Similar studies are currently underway in the Upper Trinity River Basin in Texas and the Souris River and Red River of the North basins in North Dakota and Minnesota. The findings from these studies provide valuable insight for others considering the development of a low flow early warning system.
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