Revision as of 15:18, 11 August 2015 view source Mitch3007 (talk \| contribs) Bureaucrats, Administrators 1,585 edits →Model Calibration ← Older edit		Revision as of 15:19, 11 August 2015 view source Mitch3007 (talk \| contribs) Bureaucrats, Administrators 1,585 edits →Calibration Challenges Newer edit →
Line 144: [[File:Critical_Embankment5.jpg\|600px]] <li>The ~~modeler~~modeller should NOT adopt unrealistic parameter values (eg. excessively low or high Manning’s n values) for the sole purpose of achieving a good calibration. It is invariably the fact that there are other uncertainties causing the discrepancy when unrealistic Manning’s n values are used. Unrealistic Manning’s n values or other parameters (eg. high eddy viscosity) distort the results and are a sure sign that there is something else wrong. <li>Levees, roads, railways and other embankments can have a major influence on the flood behavior. Those embankments that overtop should be ground surveyed along their crests and the crest height correctly represented in the model’s elevations. Often for calibration events the height or presence of the embankments is not known accurately and this needs to be taken into account in the ability of a model to reproduce flood marks.

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