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(t'1'~r<r UL l V 't -.- '1\ .-. :; II ~- ," ,..... Platte River Evaluation UPDATE Bureau of Reclamallon E....lu.Uon of lhe Operation of EJ.laling Projects on the Plan. Rivet for the Potential to Affect Thre.l.ned or Endangered Specl.s_ j CktolM.>r 1991 North Plan. River Projects Office, Milia, Wyoming - .- ......-::I _ & ~,~ - liIS" ~ -.',,+tl - ";', .,~~ ,.. ,-'''i . '"~,_\ Aerial \'jew of SeminOt' Dam and Resavoiroll the NOr1h Platte Ril"U Stud)" Team Actj,.ities The Hydrology Study Team leader held the third learn meeting AugU.'>1 13- H at the Nonh Plane River Projects Office in M ills., Wyoming. Team leader Duane Woodward in. ilialcd the ml:cling by restating that the role (If the llydrology Study Team is to: 1. PrO\idc cxpcrlisc on the Jal:l and methods used to develop the Plane River waler opc=ration analys;~. 2. Review and comment on the hydrology analysis and work products. 3. Keep their COn5.tiluency in. f~lrmed regarding the progress. and scope of the hydrology modeling efforts. The Study Te;tm's main focus at lhislimc is on Rcdamatinn'~ ul'vclop. ;e~l of-aNoflh Plane Ri..f"r hvdrologic model. to he used in a~\css' ~g threatened and endangered species use of the Platte River. Major hydrology work tash for developing the Plalle River water operation analysis include: . developing present wndition water supplies; . developing present conditilln demands; . dc\'eloping a South Plalle River hydrologic model: . updating the ccnlral Platte Ri\'er hy'drologic model. The Study Team agreed the operational ru.~off !>ludy-pcriod to Qt: evaluated .....ould be 1930 10 1989. Dis- plays of long-term precipitation trcnd.". annual runoff ahove Path- (ind<:r Reservi}ir and tree ring infor. mJ.lion werc rcvicwed to determine the study period 10 be used in the watcr operation analysis. The Sludy Team has reviewed the North PlaUt,; River Simulation \lnJd. a.~rnndified by Reclamation Jpring Seminoc Dam_ studies, and the computalional steps it performs to simulate the water supply and delivery (lpcralinns of the North Plane River. As part of the re\iew. comparisons were made hetween the original model and the modified model. The Study Team's re\iew of the: model's reservoir operations, nalural flow/storage flow accounting. and storage o"'-nership accounting raised a numher of que!-lions and hi~hlighted computations to Ix checked or pos!>i- hly modified prior to inclusion in lhe team model. Reclamati~m is keeping a [i_~l of the questions and chech that need to be made a!> a reference for developing the North PlaUt: River Water Utili/ation model. The Study Team has discussed the process for calibraling model!>. Calibrating ....ilJ he accomplished by comparing model resulls to a recent period of hiSloric dala!>o model refinemenls can he determined and made. Verif)ing and (csting thc (COfl/'d)