PRRIP Governance Committee Meeting and Materials

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dependant worksheet cells (unless you wish to substantially alter this example). • Column 3: EA diversion at Keystone by NPPD into Sutherland Canal system. No EA diversions are anticipated due to "conservation mode" operation by NPPD in 2008. (Currently, there are no diversions in these cells, only zeros). Column 4: The EA water passing the Keystone diversion is equal to the Mac EA release (co12) minus NPPD's EA diversion at Keystone (co13). Column 5: NPPD's estimated return of EA water via the North Platte Hydro. The NPPD EA return equals the NPPD keystone diversion (co13), with a 2-day lag, multiplied by a factor to represent higher initial losses which diminish over time as EA diversions continue. If NPPD diversions of EA at Keystone are anticipated, then these cells/loss, factors should be adjusted as needed, based on experience. Currently, the first four factors are 0.75 (days 5-8), and subsequent days are 0.8. Column 6: The estimated EA flow at the North Platte River at North Platte gage is equal to the EA passing the Keystone Diversion (co14), with a 2-day lag, multiplied by a factor to represent higher initial losses which diminish over time as EA releases down the North Platte River continue. The first factor (day 5) is 0.5, and subsequent days are: 0.6 0.7 0.75 0.8 0.85 0.9 0.95, and then remain at 0.95. These factors should be adjusted as necessary, based on experience. Column 7: Estimated North Platte River gains between the Keystone Diversion and the North Platte River at North Platte gage. For reference, the 1995-2004 median March flow was 342 cfs. These cells should be adjusted using the anticipated gains prior to and during the EA pulse. The values shown in the example • illustrate that gains are anticipated to decrease while EA flows rise and crest. Column 8: The total flow at the North Platte River at North Platte gage is equal to the EA water at the North Platte River gage plus the Keystone to North Platte river gains (cols 6+ 7). The NWS flood-limit is currently set at 1,980 cfs. Although the worksheet does not enforce this limit, the maximum daily flow is shown at the column bottom and should be checked. NORTH PLATTE RIVER & SOUTH PLATTE RIVER CONFLUENCE Column 9: The total flow at the North Platte River and South Platte River confluence is equal to the South Platte River inflow (col 1), plus the NPPD EA returns at the North Platte Hydro (co15), plus the total flow at the North Platte River gage (co18). Column 10: The EA flow at the confluence is equal to the NPPD EA return (co15) plus the EA flow at the North Platte River gage (co16). Column 11: The non-EA flow at the confluence is equal to the South Platte River inflow (col 1) plus the North Platte River gains (co17). If non-EA water is being moved through NPPD's system, then the worksheet must be expanded accordingly to account for that water in NPPD's system and in the North Platte River. Again, no non-EA water is anticipated to be released in this example scenario. CNPPID DIVERSION Column 12: The total diversion at the CNPPID diversion is equal to the minimum of the total flow at the ? confluence (co19) and the CNPPID canal capacity of 2,250 cfs. For days of intentional EA bypass (shown Water Year 2008 EA AOP 38 October 15, 2007