How should I water a newly seeded lawn?

Question:

How should I water a newly seeded lawn?

Answer:

Grass seedlings are very susceptible to desiccation and the surface of a newly seeded lawn should not be allowed to dry. Water should be applied only in amounts necessary to keep the soil surface moist. Avoid overwatering and runoff. Two light applications of water per day will usually be sufficient unless it is hot and windy. In more extreme conditions, up to four light waterings per day may be necessary. This should continue for three weeks after seeding. 

When the grass seedlings reach a height of 1 to 2 inches, gradually reduce the frequency of watering, but water more deeply.  A thorough watering once a week should be adequate for new grass that has been mowed 2 or 3 times.