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EDAPHI-PE. Dams and reservoirs

The versions of the EDAPHI-MHH hydrological forecasting applications had two methods for managing reservoirs in the future:

  • Reservoir outlet data stored in a time series file

  • Reservoir outflows for the next set in the model configuration that, by default, were set as constant and equal to the most recent SAIH measurement.

Reservoirs are treated in the MHH model as an element that cuts the topology of the system to which flows arrived (inflow) and from which they exit downstream (outflow). In the Hec-HMS model this is represented with a confluence (junction) to which the inlet flows arrive and a source (source) with flow data that represents the outlet of the reservoir.

The difference between past and future is in what is data: in the past all the series are data and in the future the inflow is the result of calculations from upstream, the outflow is a decision variable and the level (and volume) is a result.

Since Hec-HMS can only treat reservoirs with level-dependent characterizations, there are significant limitations to its representation in hydrological forecasting. This is why a solution is incorporated with MHED, which has its own hydrological calculation algorithms, although continue reading the characterization of the Hec-HMS models, but it incorporates the PE_XN module for reservoir management.


The PE-XN module will perform the lamination of the inlet flow, obtaining an outlet flow and an evolution of the reservoir level, and its stored water volume, according to different options. It can be used in interactive mode or integrated into MH hydrological models.

Another solution is offered implemented in an Excel workbook with various calculation forms. This support is widely used by dam exploitation engineers, making it easier to integrate the solution. It includes several lamination methods, Girón or volumetric evaluation among them. It can be used interactively, independent of the rest of the modules, or connected to the rest of the system.

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