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3.2.1 North Platte River Channel Limitations and Capacities <br />below Keystone Diversion Dam <br />o North Platte River Channel below Keystone Diversion Dam <br />- The initial ramp-up rate will be 300 cfs/day with no ramp down- <br />rate limits (all seasons). <br />- Flows in the North Platte River at North Platte, Nebraska must not <br />exceed flood stage as defined by the National Weather Service. <br />Current flood stage is estimated to be approximately 1,600 cfs. <br />However, it is assumed to be 3,000 cfs due to planned Program <br />improvements to the channel in the area. <br />3.2.2 CNPPID System Limitations and Capacities <br />• Central Diversion Dam at North Platte <br />- The maximum diversion is 2,250 cfs all year (barring icing <br />conditions or hydro/system malfunctions). <br />- There are presently no specified maximum ramp-upJdown rates. <br />- A full diversion is generally possible all year long and is likely to <br />occur in wet years. <br />- In average and dry years, the maximum diversion is being used for <br />irrigation from July 1 to September 15. <br />- Diversion of the District's water reduces the available capacity for <br />Program water. Program water in excess of available capacity must <br />flow down the river. <br />- The capacity available for Program water in mid-March is reduced <br />by 300 cfs, typically for Elwood Reservoir filling. This limitation <br />is applied to the total diversion limit in the tools developed for the <br />WMS. <br />B042E Page 10 of 58 January 29, 2008 <br />PRRIP - Draft Water Management Study, Phase I