You Californians watering for 2 or 3 MINUTES?????? Please explain how that can be effective at all! Seems like that tiny amount of water you apply would only coat the grass leaves and never penetrate into the ground. Seems like the water would just evaporate into the air and be wasted - both to the lawn and to your pocketbook.
Do you use super size sprinkle emitters to apply 1/4" or more water to the lawn in 3 minutes?
Sorry for sounding sarcastic. What does your land grant university recommend for watering practices?
Never mind, I found the answer at UC, a GREAT resource:
http://www.ipm.ucdavis.edu/TOOLS/TURF/MAINTAIN/irrigate.html
"Water deep and infrequently - Light sprinkling is only beneficial for newly planted turf when the roots are developing in the very top portion of the soil. As turf is established, roots extend deeper into the soil. Light sprinkling will encourage root development only near the soil surface and stunt deeper root growth. Shallow root systems require frequent watering to keep the surface wet, creating an ideal environment for weeds and diseases. Although some grasses have less extensive root systems than others, deep, infrequent watering that allows water to penetrate the top 6 to 8 inches of soil will promote healthy root growth. It also maximizes water-use efficiency and turfgrass quality.
The best times to water are between 2 and 8 in the morning. At these times, water use is most efficient, water loss from evaporation is minimal, and distribution is usually good because of good water pressure and limited wind. During the afternoon, water is wasted due to high evaporation rates. Do not water during the evening or pre-midnight hours because thatch and blades are susceptible to diseases if they are wet during cool nights. "
SUPPORT YOUR LAND GRANT UNIVERSITIES!
And, be careful. I've read that lawn watering in California can cause cancer.