DC,
First, I agree with everything my friend FireIsHot (Al) said. I live where we get more regular rainfall than he does (my run-off water ponds have been above full pool for 3 or 4 years at this point).
A number of years ago I bought a Chinese-made 2-inch semi-trash pump from Tractor Supply. I believe it is this pump:
2 inch semi-trash pump. I bought it during a holiday sale, which included this hose kit:
2-inch trash pump hose kit.
I added some additional hose and one of these foot valves so that I didn't have to prime the pump very often, which can be somewhat of a chore that can get you very wet.
2-inch trash pump foot valve My garden is a fenced area about 100 x 200 feet. I bought two sprinklers like these:
Tripod Sprinkler The pump will easily push water out of two of these, when the sprinklers are set at about 4' feet off the ground, into my 100 x 200 foot space. Actually, I have it set to overlap quite a bit.
As Al mentioned above, the sprinklers will get clogged. I clean the sprinklers and their screen filters before each watering.
My garden is probably about 20-25 feet above my pond water level. The pump is located near the pond edge. With 50 feet of pump output hoses, and another 100 feet of garden hose, I have no problem covering the entire garden with the pump running at about half throttle. A tank of gas will run for at least 1-1/2 hours. I've never measured what that equals in equivalent rainfall, but it makes the soil pretty wet.
If my funds were more substantial, I would have preferred a pump with a Honda engine. But, this one has really taken a beating over at least five years.
Good luck,
Ken