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A common request is to find the maximum value of an output. For this one can use the Min/Max block. However, in this experiment we will determine the maximum for each month of the simulation.

This means that we need to reset the Min/Max block every month. We will need the following:

• A Time point block which allows us to specify the first day of each month
• A Time event which will fire events based on the time point block
• A Min/Max block which records the soil concentration.

Create time point

1. Create a time point block
2. Edit the block.
3. In the Properties screen
   1. change the name to “Month_time_point”.
4. In the Values screen
   1. Ensure that the Dimension is Scalar
   2. Click the Settings button.
   3. Change the Mode to Day of month.
   4. Enter the value 1 as the Timepoint in the table, which indicates the 1st of each month.
5. Close the window

Create event

1. Create a time event block
2. Edit the block.
3. In the Properties screen
   1. change the name to “Month_event”.
4. In the Values screen
   1. Ensure that the Dimension is Scalar
   2. select Month_time_point and click the > button.
5. Close the window

Create min/max

1. Create a min/max block
2. Edit the block
3. In the Properties screen, change the name to Monthly_max
4. In the Values screen
   1. Enter the name _Soil_ in the Target expression column
   2. Select _Month_event_ in the Reset column
5. Close the window

Run a simulation

1. Run a simulation, then plot Soil together with Monthly max.
2. The plot should look like this:

You can download the solution here

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