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i OK <br />standards <br />-- this effect is likely to apply where any substantial type conversion or vegetation <br />suppression is applied as in Hubbard Brook experiments <br />-- treatments to emphasize water yield may result in a reduced increment of timber <br />growth <br />5. What are some of the practical limitations in applying water yield <br />augmentation technology to National Forests? <br />• Realities regarding land ownership, land allocation, operability, vegetation type, and <br />condition are often overlooked when extravagant regional or statewide projections of <br />possible increases are described. <br />Some considerations include: <br />-- Fixed constraints: <br />Ownership of the land <br />Climate and precipitation <br />Vegetation type and extent <br />Administratively unavailable lands such as wilderness, Research <br />Natural Areas, and Scenic Areas <br />Inoperable lands that are too steep, too unstable, or unproductive <br />Restricted activity areas with endangered plants and animals <br />-- Variable constraints: <br />Land allocation <br />Multiple use mix and coordination <br />sociaUpoliticaUroadless <br />economic <br />legaUwater quality <br />• The net area left after applying fixed and variable constraints determines the actual potential <br />yield. This usually results in substantial reductions in the projected increase. <br />6. To what extent are we already applying or realizing some water yield from <br />our activities? <br />• This depends on the level of past timber harvest and similar activities. <br />• In many cases, we are and will continue to have increased water yield associated with past <br />timber harvest. <br />• Cloud seeding is another factor which might increase the augmentation effect of forest