Ideally, turf should be irrigated once a week. While turf can be watered more frequently, watering deep and infrequently takes into account the root system of trees and shrubs. In August, 16.2 inches of water needs to be applied. When the turf is watered once a week, 3.6 inches will be required each time the sprinkler system is activated. The systems, therefore, should be designed so that it applies 3.6 inches of water during a single application.
Water is used by turf in the winter as shown in the table.
Therefore, winter watering is necessary to replenish this moisture. If you look at the climatic data for the Tri River Area, you will notice that we receive insufficient moisture for many of our ornamentals and turfgrasses. Even if you are using the Xeriscape plants recommended by Colorado State University you will find that some of the areas in Western Colorado even lack sufficient moisture to maintain these xeric plantings in a healthy condition. In addition, the moisture we do receive often comes at the wrong time for these plants. For detailed information on your site, you may wish to look at the data at the Colorado Climate Center .