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13 ." ,...~ .' ,..-'~ t:.ti.:.. of headgate shortage annually b.1 sale of imported water and regulated flood flows, by better regulation of flows now diverted in the winter months, and b.1 re-use of return flows. Return flows would provide an additional average annual 29,500 acre-feet of water available at head- gates below the projeot. The studies show that without the project the Arkansas Valley project lands were short of water in 46 of the 47 years studied. The project would eliminate these shortages in 20 out of the 46 years and greatly reduce the shortages in other years. The project would also furnish 20,500 acre-feet of water annually to municipalities as follows: 10,000 acre-feet to Colorado Springs, 3,000 acre-feet to Pueblo, and 7,500 acre-feet to other Arkansas Valley towns. Usable return flow from project municipal water is reflected in the analysis of irrigation supplies. The next statistical table presents a summary of the water available for irrigation in the Arkansas Valley as a result of the project. The original summary of water available for irrigation contained in House Document No. 187 shows a total headgate supply for project lands to be served in the Arkansas Valley of 189,800 acre-feet in contrast with the 163,100 acre-feet shown in the following table. The difference arises principally from the following factors I water for mUnicipal use was increased from 17,000 to 20,500 acre-feet annually; 2,000 acre-feet of additional yield annually from the city of Pueblo's Wertz Ditch is omitted in the present summary as Pueblo has improved its system so that credit for this item is no longer attributable to the project; as compared with the original hydrologic studies for 1911-1944, the extended 1911-1957 period of study shows that 4,300 acre-feet less of storable Arkansas River flood flows were regulated by Pueblo Reservoir; and finally, but of foremost importance, the conservancy district as now established covers a service area of 280,600 acres of which 268,000 acres are in the Arkansas River Valley as contrasted with the potential area of 322,000 acres contemplated in the original studies. This results in less reuse of return flows within the service area. With respect to the entire Arkansas River Valley in Colorado, however, the over-all effects of the project on water supply for irri- gation has changed very little. The f'igure in the original summary in House Document No. 187 c,f 189,800 acre-feet is comparable with 192,600 acre-feet shown in the following table. The latter figure includes 29,500 aore-feet of water available for use in the Arkansas Valley below the project lands.