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2928 xvi The effect of any future decrees granted far a second filling to an existing reservoir on the stor~ge right for Narrows Reservoir would be minor since flows :'Cl excess of direct-flow rights usually' only occur during the period of high spring runoff when reservoirs are full. Consequently, the only '/later available to existing re,ervoirs in excess of one filling is primarily restricted to late season floods that produce discharges in excess of direct-flow rights. The quantity of water so obtained is further dependent upon the capac:i. ty of the inlet channel which in most cases is being used for direct-flow diver~ion. Therefore, if the rights for second fillings are recognized by the courts, the effect or, tele rights of Narrows Reservoir will be minor. Tax Losses Numerous questions have been raised relative to the loss of taxG.ble property in j',iorgan Count;}; if the Ilarrows Reservoir :'5 constr'.lcted. The railroad will be relocated vdthin ;,iorgan Co'mty, and it is assumed t:mt the relocated line will have an assessed valtultion comparable to that of the existing line. Based on 1947 assesse:i valuation, the loss to ..organ County in assessed valuation llould be approximately 2.17 percent of the total assessed valuation. This percentage applies only to the area to be acquired in fee. Some additional losses ltill be experienced in the flood control area where easements would be taken. Under ultimate conditions, a water supp~ would be available for about 30,000 acres of land now dry-farmed. A con- siderable portion of this land to be supplied llater under the ultimate plan will be located in Morgan County and thus would eventually compensate the county for the loss of irrigated lands. Flood Control One of the primary purposes of the ,.arrows Dam is to provide flood control for the lower valley. To achieve full flood control benefits, it is necessary to con- trol historical floods on the <iouth Platte !liver and also control Bijou Creek floeds, The storage space required in the Narrov/s Reservoir for control of floods was determined in cooperation with the Corps of Engineers, based upon permissible re- leases and the flood control benefits that l;ill result from construction of the reservoir. Detailed studies by the Corps of li.nginc"rs c.eter'11ined that a, maximum capacity of 325,000 acre-feet of flood control stor8,c;e wO'lld be sufficient to control the combined snowmelt and r2instorm floods' and that orJ.] 250,000 acre-feet would be required to control rainstorm floods after June lS. ~"_~,ce snowmelt floods can be forecast in advance, it would be possible in some years to use all or part of the flood control space in excess of 250,000 acre-feet for conservation purposes. Space in the Narrows Heservoir to be used exclusively for flood control will amount to 250,000 acre-feet. In addition, there lC~ll be a jo:.nt-use space of 75,000 acre-feet for irrigation and flood control. Narrows Reser,oir would easily control the maxi- mum flood of record on Bijou Creek, which occurred in 1935. It Has not considered necessary or econonically feasible to provide sufficient flo00 control space for the extremely remote possibility of a simultaneous occurrence of the 1935 flood on Bijou Creek and the 1921 flood on the South Platte River. llegulation of ur.used flood flows based on historical records wOllld make availane about 36,000 acre-feet annually for i.r.rie"- lion.