I need to install a sump pump in my crawl space to get rid of water
if and when. My need has magnified this year because of the large
amount of snow melt and unusually high rain fall in this Delaware
area.

I am lead to believe that I can make a pit in a low spot in order to
draw in the water and then use a sump pump to direct the water
outside. I plan to try to use a pre-fab plastic pit liner if I can
find one. I plan to add holes in the bottom of the liner if not
already there, and then use a submersible sump pump inside the liner
surrounded by crushed stone.

I want the thing to be automatic, so I don't have to mess with it. IE
run when there's water - not run (off) otherwise. I notice many
pumps use an outside-the-pump float mechanism to provide the automatic
ness. I don't want that. I would like the pump to have an automatic
switch internal in the pump. I see pumps advertised as automatic,
but I want to be sure they work that way. Do they?
I guess I could buy one at Lowes and try it.

Duke