View source for How to load in dynamic evaporation rate (Water Overlay)

For a [[Water Overlay]], evaporation rate is defined in [[Weather (Water Overlay)|Weather]] data.

{{editor location|overlay wizard|The Water Overlay}}

{{howto|title=import custom evaporation rates via CSV
|Prepare a [[CSV]] file with a sequence of times and evaporation rates. (See example below.)
|Open the [[Water Overlay Wizard|configuration wizard]] of the [[Water Overlay]].
|Continue to the step concerning [[Weather (Water Overlay)|weather]]s.
|Select the weather event you wish to update, or select "Add" to create a new one.
|Set the "Evaporation over Time" setting to "Custom".
|Select "Import". This will open the "Import CSV" window.
|Select "Import new CSV", and open your file.
|Answer the prompts regarding the format of your file.
|Verify that the data has been loaded in as expected. Take special note of the time format.
|Close the "Import CSV" window.
|Close the wizard.
}}

==Example CSV==
A CSV file may look as follows:
<syntaxhighlight copy>
3600,24
7200,0
9000,24
10800,48
</syntaxhighlight>


Loading in this file, using seconds as the time unit, would lead to the following sequence of events:
* During the first hour of simulation (3600 seconds), the evaporated rate is 24 mm in 1 hour
* Between the first and the second hour of the simulation, no evaporation occurs
* During the next half hour, the evaporation is 24 mm  in half an hour, or 48 mm per hour)
* During the last half hour, the evaporation is 48 mm in half an hour, or 96 mm per hour.
* After 3 hours, the evaporation rate remains 96 mm per hour.

* A maximum of {{array max|pairs}} can be defined.

{{article end
|seealso=
* [[Weather]]
* [[Evaporation m (Water Overlay)]]
|api=* [[Api session event editor overlay set water weather]]
* [[Api session event editor weather set attribute]]
}}

[[Category:How-to's]]