The hydraulic conditions
are fundamental to the design of temporary
and demountable systems.
It is important that the correct level of assessment
is carried out to ensure sufficient robustness of the information on which forecast, alert trigger levels and design protection levels are determined. Information on the hydraulic parameters can be obtained from sources including hydrological studies, calibrated hydraulic model runs and historical catchment knowledge and records. An important outcome of the hydraulic analysis is the development of the level hydrograph. The relationship between the level hydrograph and operational processes associated with temporary and demountable flood protection operational processes is illustrated in Figure 4.1.