However, I think it was the Greeks back in ancient times who coined the phrase which translates - moderation in all things, or nothing in excess. Among other things, plants need water. And lets face it, without supplemental water most vegetable, annuals and all but the most drought tolerant perennials are going to succumb to this drought. I sometimes meet with both homeowners and professionals to try and solve landscape and garden problems. It is not uncommon to discover that no one has any idea how much irrigation is being applied, and for that matter many people don't have any idea how much or when this water should be applied.
Improper irrigation can cause plants to suffer from either too much, or the lack of water.
We all know what drought can do to plants. However, many plants will die just as quickly when they are forced to grow in the swampy conditions over-irrigation creates. If your not sure how much water your plants are getting try measuring irrigation output with rain gauges, or straight sided cans. Move the cans or gauges around the yard to check the uniformity of your irrigation. Most irrigation systems are easy to adjust.