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50 <br />40 <br />0 <br />°0 30 <br />0 <br />N <br />? 20 <br />a <br />10 <br />0 <br /> ? <br /> <br /> <br /> <br /> <br /> ? y <br /> I <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> 1 ? <br />j <br />? <br />? <br />? <br />f <br />€ <br />F <br />( <br />10 <br />8 <br />? <br />6 <br />m <br />? <br />FD' <br />4 °' <br />? <br />2 <br />0 <br />1860 1880 1900 1920 1940 1960 1980 2000 2020 2040 2060 <br />? Seed/Sap o Pole Ii Saw Li Water Yeld (in) <br />Figure 13. Age class distributions and resultant water yield for lodgepole pine from 1860 <br />to 2060. Future streamflow declines (2020-2060) will be minimal as current stands have <br />already evolved into the sawtimber class. <br />50 <br />40 <br />0 <br />30 <br />0 <br />X <br />N <br />d <br />U 20 <br />Q <br />10 <br />0 <br />5 <br />4 <br />? <br />3 p1 <br />m <br />< <br />N <br />2 <br />1 <br />0 <br />1860 1880 1900 1920 1940 1960 1980 2000 2020 2040 2060 <br />? Seed/Sap O Pole 0 Saw L Water Yeld (in) <br />Figure 14. Age class distributions and resultant water yield for ponderosa pine from <br />1860 to 2060. Future streamflow declines (2020-2060) will occur as current seedling and <br />sapling stands continue to evolve into the pole class. <br />18 2/2/2007