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WAP 2001-2002 PRRIP
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WAP 2001-2002 PRRIP
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3/8/2013 3:46:55 PM
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Water Supply Protection
Description
Staff Notebook for Platte River Research Cooperative Agreement (aka Platte River Recovery Implementation Program or PRRIP) Water Advisory Committee (WAC) Meetings including memos, comments, emails, minutes, letters, agendas, notes, etc. 2001-2002
State
CO
NE
WY
Basin
South Platte
Water Division
1
Date
1/1/2001
Author
CWCB Staff
Title
Staff Notebook for Platte River Research Cooperative Agreement Water Advisory Committee (WAC) Meetings for 2001-2002
Water Supply Pro - Doc Type
Meeting
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• Bridgeport to Lisco <br />. • Lisco to Lewellen (Inflow to Lake McConaughy) <br />• Keystone (Outflow from Lake McConaughy) to Sutherland <br />• Sutherland to Maxwell <br />• Maxwell to Cozad <br />• Cozad to Overton <br />• Overton to Kearney <br />• Kearney to Grand Island (Two day travel time) <br />Before the summer of 2001, PWAP calculations ended at Odessa. There is now the need to track <br />water to Grand Island. As more information on travel times below Overton become available it <br />may become necessary to install a new gage in the reach. <br />Conveyance Losses <br />The conveyance losses were calculated by multiplying the average number of open water acres <br />in the reach by the monthly average open water evaporation rate. The island CL value is <br />calculated by multiplying the average island acres multiplied by the average monthly island <br />evapotranspiration rate. The open water and sandbar area is considered an average because <br />depending on the flow, there will be either more open water and less sandbar area or less open <br />water and more sandbar area. The average monthly open water evaporation rate was calculated <br />using 20 years of pan evaporation data, 1980 to 1999, from the more reliable weather stations <br />. along the river, North Platte and Grand Island. The open water evaporation is equal to the pan <br />evaporation data multiplied by a standard factor of 0.7. <br />The average island evapotranspiration rate is much more difficult to determine. An American <br />Society of Civil Engineers report called Water Use by Naturally Occuring Vegetation Including <br />an Annotated Bibliography sums up the problems with the following statement: <br />In summary, the process of estimating or determining evapotranspiration of naturally occurring <br />vegetation is fraught with uncertainty. Not only is it difficult to accurately determine the <br />appropriate water use, but it is even more difficult to extrapolate the results to larger areas. <br />Winter and growing season factors were estimated using data found in that report and other <br />sources. The factors are estimated ratios of the island evapotranspiration to open water <br />evaporation and are dependent upon the soil type, depth to water, and the type of vegetation <br />present. A table of vegetation common in the area and the associated average annual <br />evapotranspiration can be found in Appendix A. The winter factor used is 0.5 and the growing <br />season factor is 0.8. A sensitivity analysis showed that changes to these numbers do not <br />significantly affect the resultant monthly evapotranspiration loss values and that the greatest <br />expected change was less than 5 cfs per tenth of change. <br />State Line — Lewellen Calculations <br />The North Platte Decree sets the CL values for these reaches for the months of May to <br />September. The negotiated values were based on river surface area, average evaporation, and an <br />• evapotranspiration factor. In order to have October to April values consistent with the decreed <br />2 <br />
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