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I have a sump that at one point never ran. I was bone dry. Then new contruction of an industrial park where they routed all its run off towards my neighborhood resulted in the need to pum in the wet seasons. Its bone dry mid summer and while not dry , it doesn't run much when eventhing is frozen.
Key elements are locating the pump itself if its a diaphram submersible or the float ball if its that style , at the correct hight. You want it to run before it gets up to floor level but you don't need to pump forever trying to lower the whole watertable by 5 feet.
The check valve is tough and if possible I would try not to use one. As long as the pump doesn't cycle do to the backflow from the vertical pipe , you don't need or want a check valve IMO. If the check vale is a simple one it could get stuck and then you flood. That means you may need a spring loaded one and when the spring gets old or crappy the valve can again get stuck.
I use a hole just about 18 inchhes deep with wshed stone the size of say big starwberries. I use a little Giant bronxe submersible pump. It has a diaphram switch and so I use the stones to get the right height so that the pump turns on when the water is abot 4 inches below the floor. Lost and lots of days I do not have to pump because the water is just 5 or 6 inches below the floor. The pump is very expensive , like $450 but its a great pump and will last 35 years. Even then its probably the diaphram switch that will go , not the bronze pump elements. The diaphram switch can be rebuilt even after 35 years with a kit. The pump has a lot of capoacity so I never face the situation of "the pump can't keep up". In fact I think it pumps so much water there are times I think its cycling on and off too much because my hole is too small in diameter , not too deep.
Anyway , you may want to talk to some more people because a deep hole and check valves , etc is almost exactly the opposite of what you need in many cases.
I don't understand Ebens post at all. I'm not saying he's wrong , I just don't understand what he means the way he describes cementing in the hole.
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