I used to do landscaping on newly built homes. Sometimes we had to make Burms to divert water runoff. Might have to walk around when it's raining to find a good spot or two to make a burm. We had frontend loaders/tractors which made it quick & easy. You can use cinder bricks, just lay them on the ground end to end. Don't make a dam, just angle them to make the runoff go around.