Time varying OL Drainage parameters

In projects where you want to simulate the build out of an OL Drainage net­work over time, or changes in the OL Drainage time constants over time, then you can use the Extra Parameters: Time varying OL drainage parameters (V1 p. 749). Without this set of Extra Parameters you would have to hot start your simulation at regular time intervals with the new OL Drainage parameters.

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Note: If you specify time varying OL Drainage parameters, you will not be able to use any of the drainage routing methods that depend on the OL drain level. The drain level methods are not allowed because the source-recipient reference system is only calculated once at the beginning of the simulation.

The preprocessor checks this and gives an error if you have specified

·         option 1 (routing based on levels), or

·         option 3 (distributed options) AND any of the distributed option codes are 1 (routing based on levels in these cells).