SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

New to the forum. Having a pool put in my back yard and I had a 4 valve sprinkler system there including a 5 valve in the front yard. Well, the piping and electrical wires went through the pool so of course they cut them, I'm trying to make sense of it all. The backflow preventer is in the front yard so the supply water to the back valves goes from there to the opposite corner of the house, at least a 50' run. Then the control box is in the garage opposite of the backflow side so the wires go down that side of the house into the backyard valves, across the back yard in the piping trenches to the front yard valves. So, I figured out how to salvage the piping and most of the sprinkler heads. But they cut the wires somewhere under the pool pump and filter pad and several other places, the wires are red and white, loose. Can I splice into the wires or should I run new wire from the controller to each of the pumps, 9 runs at 50' and 5 runs at 60', that's going to be expensive.
Thanks!