Rating Curves Modification
This category is dependent on having Flat Top Surcharge method selected in the Surcharge Release category. Methods are used to optionally modify the Rating Curves table.
NoneThis is the default method, no modification to the Rating Curves is made.
Specify Rating Curves using ElevationWhen the Specify Rating Curves using Elevation method is selected the following slot is added.
Slots Specific to This Method
Rating Curves using Elevation
Type: Table Slot
Units: Elevation vs Flow vs Flow
Description: This table represents the Rating Curves Table with Elevation as the independent variable instead of Storage as shown on the Rating Curves table. Thus, The table relates Elevation, Induces Surcharge, and Free Flow Rating Curve.
Information: Specified only
I/O: Not linkable
Method Details
When this method is selected, at the beginning of the run, the reservoir will generate the Rating Curves based on the Rating Curves using Elevation slot as follows.
1. Copy all of the data in the Rating Curves using Elevation table to the Rating Curves table. This will resize and/or rebuild the table as necessary.
2. For each row in the Rating Curves using Elevation table, the Elevation will be looked up on the Elevation Volume Table to determine the Storage.
3. The Storage will then be written to the Rating Curves table. The Induced Surcharge Curve and Free Flow Rating values were already copied from the Rating Curves using Elevation table.
4. The Rating Curves table will be marked as “has Source Slot”. This makes the slot read-only with cross hatching over the value. It also adds:
Note: These values are automatically generated based on Reservoir.Rating Curves using Elevation.
Within the Flat Top Surcharge method, the original Rating Curves (storage based) tables will be used for all computations.
Revised: 07/09/2023