LA RAINFALL
Source: Los Angeles Times Daily Weather Section; downtown Los Angeles readings. The LA Times utilizes data on a season/annual basis that begins July 1 and ends June 30 of each year. Thus, current season means “from July 1, 2009 to date”, and season norm means “from July 1 to date.” Each of these data are updated daily by the LA Times, and updated monthly on this web site.
CALIFORNIA SNOW LEVELS
Source: California Department of Water Resources; California Data Exchange Center; California Cooperative Snow Surveys; this statistic shows two key statistics describing the percent of snow water equivalents (i.e., moisture content in the snow pack): 1) as a percent of normal; and 2) based on the assumption of an April 1 “peak snow water accumulation” date.
Note: The most important characteristic of snow to water managers and hydrologists is its water content. However, depth is of interest to many people also. State data collection equipment measures the weight of the snowpack, and therefore its water content. New-fallen snow can range in density depending on the air temperature and intensity of the storm. In California, densities of 12% are common. This means that for every 10 inches of snow that accumulates, it will melt to a pool of water 1.2 inches deep. After snow falls, it settles and compacts. The snowpack gets less and less deep, but the snow doesn't melt or go anywhere. Rather, its density increases. Therefore, snow depth is a fleeting indicator of the snowpack. By obtaining a measure of the water content of the snow, which doesn't change unless more precipitation occurs or the pack melts, we have a good handle on how the rivers will react in the spring. After May, the snowpack melts due to both rainfall and the intense sunshine of late spring and summer, which is the principal melting energy source.
CALIFORNIA RESERVOIR LEVELS
Source: California Department of Water Resources; California Data Exchange Center; Summary of Storage in Major Reservoirs; includes 158 reservoirs in California, North Coast, and Colorado River (Lake Mead, Lake Powell); these statistics show reservoir levels statewide, both as a percentage of average and a percentage of capacity as of December 31, 2008.
WATERING INDEX
Source: Metropolitan Water District. The Watering Index is a scientifically based guide to help people adjust watering schedules for landscape irrigation controllers (also commonly known as "timers") that include a water budget adjustment feature. This feature - either a button or a dial - permits the watering run times for all electric valves managed by a controller to be increased or decreased with just one adjustment. The Watering Index represents the recommended percentage setting for the watering adjustment feature. The index is normally 100 percent for much of July and August. Over the course of the year the index changes to reflect the landscape’s changing need for water as climatic conditions change. As new Watering Index values are published weekly, the controller’s percentage adjust feature should be changed to match the current index value.
Note: the Watering Index does not provide watering times for each electric valve or station. Instead, it simply specifies a value that the percentage adjust feature should be set at. The watering times will automatically change across the board when the percentage adjust setting is changed.
The Water District is planning new outreach and education programs targeted at schools in member cities for Spring 2009. We're working with member cities, boards of education and local school staff to deliver important water-saving information in early 2009 as heavy water consumption months approach.
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The Water District is planning new outreach and education programs targeted at schools in member cities for Spring 2009. We're working with member cities, boards of education and local school staff to deliver important water-saving information in early 2009 as heavy water consumption months approach.
