Have you talked to him about the runoff? If he is getting runoff, then he's got a problem of one kind or another. What it all amounts to is that he's wasting water. Runoff doesn't do anyone any good. His soil is not absorbing the water likely because it is not in a healthy condition. Or he's watering far too long each time. He should be watering up to the point of moistening the surface of the soil right under the sod. Anything more than that is being wasted. If the soil becomes soggy or squishy, he's watering waaaaaay too much. Proper watering for new sod might be only 3 minutes or it might be 15 minutes. With some of the high flow systems 1 minute might be enough to moisten the soil surface.

No I haven't spoken with my neighbor; it's a seasonal cottage we are only up there on week-ends,.

I am pretty sure the landscapers who put the lawn in set the irrigation timers with approximate times.

That's why I am looking for away to block or slowdown the water.

Thanks

Metal or plastic landscaping edging could be used. The metal stuff comes in straight pieces. If you want it permanently, you might want to get it from a nursery. They carry a heavier gauge metal than the home stores do.

Thanks dchall,

Great idea