Hello, I have a merlon $($like a wall$)$ around a reactor. Inside the merlon there is a sump that collects rain water, and a sump pump that pumps the water out of that sump when it gets to a high level. I need to know how many time it will take for the rain water to fill a certain high in the merlon $($considering the sump will be at maximum height$),$ considering also the capacity of the sump pump. What information do I need to have and what are the formulas that need to be used. Here is a drawing of the merlon with the reactor inside of it and on the right bottom we have the pump and sump pump