Is it possible to define specific operation times for a pump?
How to define the moment when pump begins operating, and the moment when pump stops operating?

I have a system that works fine, except for peak hours (7AM to 9AM). There is a storage tank, but with no elevation. Thus, How can i simulate a pump added to the tank so that it will operate during peak hours.

The easiest way is to use a constant power input pump. However, when I go to extended period, and try other pump, I don't know how to control the operation times of the pump. For instance, the constant power and steady state suggest to pump X flow with Y head gain. If I use those X Y values as design point, I get other results (it always uses the maximum flow which is 2*X).

How could I define the operation rules of the pump?