RDK,
I agree with Dieselplower and Addy on the use of rigid PVC pipe, especially for burial. Flexible hoses and tubing might be fine inside a pump box where you are restricted on space and need to make some "creative" bends. In such applications, you can easily access the area and if there is a leak, you can spot it right off and replace or repair the hose, but you can't do that if it is buried underground.
With 1" or even larger rigid PVC tubing, you can make shallow, long radius bends for undergound burial by heating the tube with a good heat gun. If you are very cautious and applied some practice, you could also do this with a propane torch. Heating the PVC just enough to allow a bend to start taking shape is all you want to do, no more than that or the tubing will melt and collapse on you or even burn or char. You would want to experiment with short pieces of scrap PVC tubing to become adept. Heating the tubing uniformly all around the outside perimeter and not on just one side will aid in keeping the shape of the pipe from flattening or creasing. Creating bends in the tubing this way would prove beneficial as the fewer fittings (ells and elbows and such) will reduce the restrictions on the water flow and also reduce the possibilities of leaks due to a poorly glued fitting joint.
Gordy