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The routing tool was applied to evaluate two flow targets, the 5,000 cfs 3-day pulse <br />during the low-demand period (September to May) and the 800 cfs steady flow during the <br />irrigation season (May to September), for the 60 year period from 1947 through 2006. <br />The results for each of the 60 years are summarized for the Average, Wet, and Dry year <br />classifications. The routing studies for each target flow were completed for the following <br />cases, per the RFP: <br />• Case I- No Program water will bypass the Districts' system when the Districts have <br />the capacity within their system to divert it. Program Water will be diverted by the <br />Districts subject to the available capacity in their system to divert water. Where <br />constrained by canal system capacity, available Program water may be left in the <br />channel to flow down to the critical reach. <br />• Case II - Program water can bypass the Districts' system even if the Districts have <br />the capacity to divert it. Program Water will bypass the districts and be subject to the <br />operations of the river. <br />The tool developed for the routing of flows through the Platte system was developed as <br />an Excel spreadsheet representation of the Platte River from the Roscoe gage on the <br />South Platte River and Lake McConaughy on the North Platte River downstream to the <br />Overton gage. The spreadsheet includes the Platte River reaches from upstream gage to <br />downstream, the NPPD Korty and Keystone Diversions, the CNPPID Diversion, and the <br />North Platte Hydro, Jeffrey, and J-2 Returns. <br />Canal and river capacities and ramping rates are represented in the routing tool as <br />described in Section 3.2. These capacities are included as variables in the tool to facilitate <br />sensitivity analyses of these physical, administrative, and operational constraints. <br />The routing tool utilizes a daily timestep to estimate the travel times and losses through <br />the system. Travel times are estimated at 1 or 2 days depending on the location in the <br />system. Historical travel times may vary or may be more or less than a multiple of a day, <br />but the use of a daily increment necessitates this approximation. The estimated travel <br />times for the key locations in the spreadsheet are summarized in Table 3-5 (Section 3.5). <br />BOWLE Page 25 of 58 January 29, 2008 <br />PRRIP - Draft Water Management Study, Phase I