Hydrograph Library
- 21 Jun 2024
- 5 Minutes to read
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Hydrograph Library
- Updated on 21 Jun 2024
- 5 Minutes to read
- Print
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The Scaling tool is accessed when adding a hydrograph to the hydrograph library within a Calculation point.
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FEH Reconciliation
The FEH Reconciliation tab enables users to apply scaling factors to hydrographs, whether calculated by the tool (e.g. scaling ReFH peak flows to WINFAP derived peak flows) or provided by the user. It also presents both the Flood Frequency Curve (FFC) and the reconciled hydrographs for comparison.
The left-hand-side of the FEH reconciliation tab provides the following fields:
| Field in interface | Description |
|---|---|
| Hydrograph name | Allows you to specify a custom name for the reconciled hydrograph. |
| Description | Allows you to specify additional information or notes related to the hydrograph. |
| ReFH2 version | Dropdown to select ReFH2 version from all analyses performed within the calculation point. A reason for using the selected ReFH2 version can be provided in the field to the right. |
| REFH2 CD version | The version of catchment descriptors used within the ReFH2 analysis selected in the field above (ReFH2 version). This is provided for information only. |
| ReFH2 seasonality | The seasonality used within the ReFH2 analysis selected in the field above (ReFH2 version). This is provided for information only. |
| WINFAP version | Dropdown to select WINFAP version from all analyses performed within the calculation point. A reason for using the selected WINFAP version can be provided in the field to the right. |
| WINFAP distribution | Dropdown to select WINFAP statistical distribution from all available options. A reason for using the selected WINFAP distribution can be provided in the field to the right. |
| WINFAP CD version | The version of catchment descriptors used within the WINFAP analysis selected in the field above (WINFAP version). This is provided for information only. |
| FEH CD Urbext | The Urbext value provided within the catchment descriptors specified in the field above (WINFAP CD version). This is provided for information only. |
| Urban / Rural | Radio buttons to select between urban and rural. A reason for using the selected option can be provided in the field to the right. |
| Hydrograph scaling table | A table of the hydrograph data. In the 6th column, the user can specify scaling factors to override those provided. In the 7th column, the user can provide comments. |
The right-hand side of the window is split into two tabs: FEH Reconciliation and Reconciled Hydrographs.
The FEH Reconciliation tab displays the FFC plots alongside ReFH2 and the reconciled plots. This process involves combining the results of your ReFH2 and WINFAP analyses with scaling factors to create inflow hydrographs for 1D or 2D model boundaries. The resulting inflow hydrographs are then added to the Hydrograph library for further use.
A toolbar along the top of the graph provides the following options:
| Field in interface | Description |
|---|---|
| Chart options | A drop-down menu providing additional functionality related to customizing and interacting with the chart as follows:
|
| Line Width | The line width option controls the thickness of the hydrograph line on the graph. Adjusting this value can make the hydrograph more prominent or subtle, depending on your needs. |
The Reconciled Hydrographs tab displays the flow timeseries resulted from applying the scaling factor (calculated or user derived) on the ReFH2 timeseries.
A toolbar along the top of the graph provides the following options:
| Field in interface | Description |
|---|---|
| Chart options | A drop-down menu providing additional functionality related to customizing and interacting with the chart as follows:
|
| Line Width | The line width option controls the thickness of the hydrograph line on the graph. Adjusting this value can make the hydrograph more prominent or subtle, depending on your needs. |
| Return periods dropdown | It allows you to select a specific return period for which you want to view or analyse the hydrograph, or all. |
| Show original hydrograph checkbox | When you check this option, it displays the ReFH2 hydrograph, without any scaling factors. |
The bottom right corner of the window provides two buttons:
| Field in interface | Description |
|---|---|
| Cancel | Clicking the ‘Cancel’ button allows you to discard any changes or modifications you’ve made within the Scaling Tool. |
| Next | The ‘Next’ button typically advances you to the next step or section within the tool, which is Climate change and custom scale factors. |
Climate change and custom scale factors
This tab of the Scaling Tool provides functionality related to incorporating climate change impacts into flow estimation and adjusting hydrograph scaling factors.
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The following options are available on this tab:
| Field in interface | Description |
|---|---|
| Apply climate change uplifts to baseline | Allows you to incorporate the effects of climate change into your hydrograph scaling process. The uplifts represent the predicted changes (as a percentage increase) to the baseline hydrograph due to climate change. |
| CC uplift area | By clicking on the ellipsis (triple dots) at the corner of the CC uplift area box, a small window called Select uplift area will open which provides options for specifying the geographic area and catchment for which the climate change uplifts have been calculated. By default only locations within which the catchment falls can be selected, but this can be overridden. |
| Apply custom factors to baseline | Allows you to adjust the baseline hydrograph using custom scale factors. |
The selected data is displayed in a graph to the right. A toolbar at the top of this graph provides the following options:
| Field in interface | Description |
|---|---|
| Chart options | A drop-down menu providing additional functionality related to customizing and interacting with the chart as follows:
|
| Line Width | The line width option controls the thickness of the hydrograph line on the graph. Adjusting this value can make the hydrograph more prominent or subtle, depending on your needs. |
| Return periods dropdown | It allows you to select a specific return period for which you want to view or analyse the hydrograph, or all. |
| Show baseline hydrographs | Checking this option reveals the baseline hydrographs., without climate change uplifts applied. |
The bottom right corner of the window provides three buttons:
| Field in interface | Description |
|---|---|
| Cancel | Clicking the ‘Cancel’ button allows you to discard any changes or modifications you’ve made within the Scaling Tool. |
| Back | This button typically takes you to the previous step or section within the tool, which is FEH Reconciliation. |
| Save Hydrograph | Clicking the ‘Save Hydrograph’ button saves the adjusted hydrograph based on the applied climate change uplifts and custom scale factors. |
Climate Change Guidance
Hydrograph adjustments for climate change provided in the scaling tool are based on relevant guidance for each of the UK nations as detailed below. Guidance is subject to review and update, users should ensure appropriate uplifts are applied for their analysis.
| Nation | Organisation | Climate Change Guidance |
| England | Environment Agency (EA) | |
| Scotland | Scottish Environmental Protection Agency (SEPA) | |
| Wales | Natural Resources Wales (NRW) | |
| Northern Ireland | Department for Infrastructure (DfI) |
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