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Heppner, Oregon Flood Warning System: An Interagency Cooperative Effort

by Jeffrey D. Hanson, US Army Corps of Engineers, Portland, OR, USA,



Document Type: Proceeding Paper

Part of: Engineering Hydrology

Abstract:

The flood warning system is a network of event-actuated precipitation and river level gages in two flash flood prone drainage basins of 44 and 6. 8 square mile areas. These basins enter the City of Heppner below Willow Creek Dam. The radio telemetered gages report to the base station which processes the data and provides five levels of flood warnings based on certainty and severity of the event. The base station also receives project operational data such as lake elevation, inflow, and outflow, and combines that data with the forecasts from the two basins for a downstream routed forecast. The base station's mini-computer/data logger monitors the various sensors, evaluates incoming data, and by using a continuous self-adjusting model, computes basin hydrographs. The forecasted hydrograph is converted to stages, levels are evaluated, and audio-visual alarms are given, if applicable.

Subject Headings: Floods | Disaster warning systems | Hydrologic data | Forecasting | Hydrographs | Basins | Rivers and streams | Oregon | United States

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