How much water drains into your sump depends on the overflow and the output pipes. For example, if they are faced all the way down there will be a lot going into the sump. If they are pointed all the way towards the surface, then not much will go to the sump. I don't know how your plumbing is set up, but that's how it is for me and other people. Test the level out and if the sump looks like it's going to overflow put the pump back on and adjust whatever that needs to be and try it again.
“Success is walking from failure to failure with no loss of enthusiasm.”
- Winston Churchill