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the Platte-Niohrara Subbasin had the highest average per-site use of industrial water in that year. With re- gard to municipal and rural domestic water, the data shows, that with minor exceptions, per-capita use in both categories has continually increased in all sub- basins over the study period. The Middle Missouri Subbasin displayed the highest average per-capita use of water in both categories in 1978. The total annual percent of historic streamflow de- pletions by subbasin are shown on Figure 3. In 1978 the Platte-Niobrara Subbasin accounted for almost one-third of the total depletions in the Missouri River Basin. That area, with its large increase in irrigated acres and municipal growth, is by far the area with the highest volume of water use in the Missouri River Basin. Together, the Upper Missouri and Yellowstone Subbasins accounted for about an additional one-third of the total streamflow depletions in 1978. As shown on Figure 3, the volume of depletions within the Yel- lowstone and Upper Missouri Subbasins had little change from 1944 to 1978, increasing from 2.10 to 2.35 million acre-feet in the Yellowstone Subbasin and from 2.40 to 2.98 million acre-feet in the Upper Mis- souri Subbasin. Other subbasins have had significant increases during that time period. The other five sub- basins, Western Dakotas, Eastern Dakotas, Kansas, Middle and Lower Missouri, accounted for the re- maining one-third of total streamflow depletions in 1978. Total streamflow depletions increased by 5.46 million acre-feet during the 1944 to 1960 period and Figure 3 Missouri River Basin Total Annual Historic Streamflow Depletion by Subbasin Platte-Niobrara 39.8% Eastern Dakota 0.8% Western Dakota 30% 1944 Middle Missouri 1 7% Kansas 2.1 % Lower Missouri 3.1 % 9.08 Million Acre-feet 1960 Middle Missoun 2.5% Kansas 5.4~/o Lower Missouri 2.8% Eastern Dakota 1.3% Platte-Niobrara 32.1% Yellowstone 21.7% 14.54 Million Acre-feet 6 1978 Platte-Niobrara 32.0% 11.19 Million Acre-feel