Hydrograph Library

The Hydrograph library tab allows you to create hydrographs from your completed analysis, and store these for future use and application to model simulations. Key features of the Hydrograph Library tab are:

• Reconciliation of WINFAP and ReFH2 analysis
• Scaling of hydrology to consider climate change allowances
• Application of custom scaling factors

Adding new hydrographs

Click Add Hydrograph to open the Scaling tool in a new window, automatically loaded with the preferred ReFH2 analysis, scaled to the peaks from the preferred WINFAP analysis. 

On the FEH reconciliation tab of the scaling tool, you should provide a name and description for your set of hydrographs, and can change the analysis used. Flood Modeller displays calculated reconciliation factors as a table where users can inspect values and also provide user specified values. If user specified values are chosen, is is recommended that comments are added to document decisions. Scaled hydrographs can be viewed on the next tab.

On the Climate change and scaling factors tab, both climate change allowances and custom scaling values can be applied to reconciled hydrographs. Climate change allowances are based on guidance from the Environment Agency, Natural Resources Wales, Scottish Environmental Protection Agency and Department for Infrastructure as details in the technical reference. Uplifts are based on the basin in which the catchment lies and as defined when the Calculation Point is created. Where a catchment lies across multiple basins or a user wishes to over-ride the default basin, the basin can be specified under the "UU Uplift Area" menu.

Full details of all options provided within the scaling tool are provided in the Scaling tool technical reference.

Editing and exporting hydrographs

Hydrographs added to the library can be viewed using the View Hydrograph button. This opens the Scaling tool with the selected hydrograph loaded. From here, you can make further adjustments and save as a new hydrograph.

Hydrographs can be exported to .csv format using the Export Hydrograph button. 

Your exported hydrographs can then be used as input data for 1D river and 2D simulations. Full details on this can be found in this article on Using H+ outputs in simulations.