Guys, thanks for your continued interest.

898gpm = 15 gallons/sec. That's a lot of water to expect from a
3" by 13 foot hole.

The well is 3', 3 feet in diameter. I figure 8' of usable water * 1.5 *
1.5 * 3.14 * 6 gal/cuft = about 350 gallons. I'm still looking for my
sprinkler specs (I'll just measure it if I can't find the specs), but 4
sprinklers ought to take at least

I would expect that pump
to fail under such a design.

Harry, the tank does have the reserve tank integrated, so I'm guessing
the people who designed the system sized the pump and the tank taking
into account a wide variety of flows.

In any case, I will take the many advices about testing the system
before trenching the whole cheebang.

Say, if I loose my pump or it explodes, would a submersible pump at the
bottom of the well be a better ideeyer? For sure, less maintenance and
no priming hassles.

Thanks to all