The link on the Facebook page shows Alan Titchmarsh explaining the most effective way off watering, albeit in a flower garden but the same applies to veg plots. I have always avoided watering on the plot as much as possible as I didn't want to be tied to daily visits but I think I have probably carried it too far and suffered crop loss very often as a result. I am now watering seeds and newly planted crops to give them a good start and then watering very sparingly when the weather demands it - like now!
I have always sown and planted into trenches or depressions so any water I do use has maximum effect.
My carrots will get special treatment however. Carrot seedlings die off if they dry out just a little bit so I always sow in a trench and the cover with a plank lifted off the surface by bricks, as in the photo.
I was not quite so early this morning as I am off out for the day, so I concentrated on a quick visit to water and sprinkle paraffin. I also dropped off the extension pieces for the compost bin, but that is for another day.