Applicability of MIKE FLOOD for hydraulic simulations - Technical Memo


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As the value of property and structures within flood prone areas continue to increase, the pressure to develop in these areas also increases. As a result, it is becoming more crucial than ever before to obtain an accurate delineation of the floodplain and to reliably predict the impacts of flooding in these areas. An overly conservative estimate of the floodplain may be an economic detriment to a community, preventing lands from being developed and decreasing the potential tax base. On the opposite end, an underestimation of the floodplain can result in loss of life and extensive property damages.
Traditionally, hydraulic flood modeling has been performed using either a stand alone 1D model or stand alone 2D model. However, recent advances in software and numerical methods have introduced a dynamically coupled 1D and 2D approach that is able to take advantage of the numerical efficiencies of a 1D model and the predictive detail of a 2D model. This new approach is ideal in cases where floodplain storage and conveyance can be significant, or cases where there may be multiple flow paths or undefined paths for out of bank flow. Traditional 1D hydraulic modeling may not accurately represent conveyance and storage of flood waters on the floodplain and has further limitation in that the modeler must predefine the flow paths. Traditional stand alone 2D modeling also has limitations in how accurately it is able to represent the effects of hydraulic structures and also the representation of the main river channels. For these, and other, reasons traditional hydraulic modeling methods may not be sufficient to simulate the inundation extents, depths and flow velocities in some cases.

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