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EXPLANATION OF WATER-USE DATA FORMAT This section contains graphical and tabular summaries of water-use data for the State of Colorado, for each of the 63 counties in Colorado, and for each of the 17 hydrologic subregions in Colorado. At the top of each page is a map that shows the location of each area being discussed and a short table that summarizes salient features about each area. The "State of Colorado" summary page shows, for example, that 3.23 million people resided in Colorado in 1985, that about 3.01 million of them received their domestic water from public-water suppliers, and that about 222,000 of them had t~eir own source of water. Across the middle of each page are a pie diagram and a table that show the breakdown of water used by wa~er-use category--the numbers for the pie diagram are in percent, and the numbers in the table are in million gallons per day. Data in the county and hydrologic subregion tables are shown to two decimal places so that the total water use is equal to the sum of the parts. This is not meant to imply that the data are always as accurate as shown (see "Limitations of Data," p. 6). For the State, irrigation was the largest water use (59.6 percent of water used, or 12,400 million gallons per day), and power was the second largest use (35.5 percent of water used, or 7,393 million gallons per day), followed at much smaller percentages by domestic, industrial, other, commercial, mining, and livestock uses. Total water use was 20,800 million gallons per day. Eight bar graphs (at varying scales) are shown at the bottom of each page. These bar graphs show the breakdown of water used within each category (and for all water used) by source type (ground water or surface water), supply method (public-supplied or self-supplied) and by disposition type (return flow or consumptive use). The "All water uses" bar graph for the State of Colorado shows, for example, that almost all (about 90 percent) the water used is surface water, that most of the water is self supplied, and that one-quarter of the water used is consumptive use. It should be pointed out that in some bar graphs very small proportions of water use are not discernible. For example, for "Power'l use in the State of Colorado, the bar graph shows that all the water used is self-supplied surface water and that it is all returned to streams. In actuality, very small proportions of water used for power generation are ground water, public supplied, and consumptive use. The actual data for these uses are in the tables in the "Supplemental Data" section at the back of this report. 29