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l'ruend le/Na ril:crvis/Porth f'agc 11 5/22/2003 <br />Ohviuusly thrrc is a tremcncfuus amount ot' speculation and uncertainty in discounting the <br />limitrd amoum of currcnt torest stand data hack to 1860. [)isaounting hack to 1700 is a grcater <br />Irap af' faith and wc did it unly to dispel the conclusicin that stream (low w:ts consistcntly high <br />priur to 1860. Ilowever, since we du know that vegetation dcnsiiN, has inrreased with time <br />(especially in thr Nurth Plattr drainage) the simulations are an incler to what may havr occurrcd <br />hydrulugically. 'I'he point to tx made is that althuugh streatn tlow was high in thc micl to? I.ste <br />18U1)'s and luw in 1997 that is not likely to hx- a uniyue situation. Flow patterns arc most likcly tu <br />t?e sontewhat cyclical and change a: the vegetation changes uver timc. <br />fithle 2: ('omparisun of thc unit area water yicld, by individual forest species, and thr tutal <br />annual water yield simulated to occur trum Natiunal Forest land in the North I'latte <br />River 16r the Fxriod 1860 to 2017 whcn: I) stand structurc for sprucc-fir is adjustcd as <br />tiir othrr species (S1: Adj) and 2) when stand structure f?or sprure-tir is held contitant tur <br />tht eriod (ti1: Fixed). <br />_ Water Yield inL 1 <br /> <br />YEAR <br />As en Douglas <br />Fir Limber <br />Pine Lodgepole <br />Pine Ponderosa <br />Pine Spruce Fir <br />Ad ustedl Spruce Fir <br />Fixed) Tot <br />( <br /> <br />1860 <br />9. <br />5.1 <br />8 <br />8. <br />4. <br />212 <br />15 _ <br />1880 8.9 5. 8. 8. 3. 20 , <br />15. <br />1900 10. 5.1 8. --8- 3. 19. 15.- <br />1920 11. 4. 10. 10.4 3. 18. 15. <br />1940 10. 31 9. 9. 2. 17.4 15. <br />1960 9. 3. 9. 9.3 2. 17.1 15. <br />1980 9.1 2.11 8. 8 1 16. 15. <br />1997 8. 2. <br /> <br />? 6' <br />. <br />6. <br />-- 1 1 <br />15.4 <br /> <br />L <br />15. <br />2017 8. 2.0 6.9 86 0. 151 5 <br />. <br />0 <br />0 <br />0 <br />0 <br />0 <br />? <br />x <br />? <br />a? <br />L <br />U <br />Q <br />10 <br />1860 1880 1900 1920 1940 1960 1980 1997 2017 <br />N Non ? Seed/Sap ¦ Pole 0 Saw OWater Yield I <br />al Yeld Total Yield <br />SF Adi) i(SF Fixed) <br />13 11. <br />12 11. <br />13 1 11. <br />- <br />12. 11 <br />11 1 10 <br />10 <br />- 10. <br />-- <br />10,2 10 <br />10 10 <br />9. 9 <br />13 <br />12:* <br />d <br />11 ° <br />< <br />? <br />10s <br />9 Z <br />Figure 9: Histori< <kater yicld and stand cumposiliun t?)r all t'orest species on National Forest <br />land in the North Platte itiver 13asin Gum 1860 to 1917. In contrasl to Figurr ?, thc