get a length of 1/2 or 3/4 pvc conduit and connect a pvc pipe to hose adapter on one end. Connect the hose to it and dig a hole on each side of the driveway about 1 foot deep and about 1 foot wide, and at least 2 to 3 feet back from each side of the driveway. Push the pipe under the driveway from one side as far as you can. Have someone turn on the water and keep pushing the pipe in and pulling back slightly after each push and the pipe will gradually go farther and farther under the driveway. If you started with a 10 foot section of pipe, when you get about 8 feet under the driveway, you will need to cut the pipe and add another section. You might want to use shorter sections if you don't have a lot of room. Just keep cutting off and adding another section as each one goes under the driveway. The back and forth motion is so you can clear any rocks out of the way as you progress. I have used this method many times and it always works. Just be sure that you are not pushing the pipe under at a downward angle or it will go too deep on the other side. It should take only 10 to 15 minutes to push 8 feet of pipe under the driveway using this method. Good luck!